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HomeMy WebLinkAboutUST MITIGATION KERN HIGH SCHOOL DISTRICT SITE CHARACTERIZATION WORK PLAN SOUTH HIGH SCHOOL PROJECT DESIGN BY: Randall T. Metz Pacific Geotechnical Associates, Inc. Rodney N. Williams SISK Kern County Superintendent of Schools 5801 Sundale Avenue Bakersfield, CA 93309 (805) 398-3710 FAX (805) 398-3721 October 25, 1990 .. P:O. BOx 9939 Bakersfield, CA Flora Darling Hazardous Materials Specialist Environmental Health Services Department 2700 "M" Street, Suite 300 Bakersfield, CA 93301 Dear Ms. Darling: SUBJECT: Site Characterization Work Plan Kern Union High School District Location: ll01 Planz Road, Bakersfield, CA 93304 Known As: South High School Permit #: 310009 This correspondence is being submitted as the proposed Site Characterization Work Plan to determine the vertical and horizontal extent of soil contamination associated with the South High School underground storage tank. I hope this plan is satisfactory to you and meets the criteria as stated in the "UT-35 Handbook." Should you have any questions as you review this plan, please feel free to call my office at any time for clarification. CONSULTIN~ FIRMS The Self-Insured Schools of Kern (SISK) Safety and Environmental Control Staff has been selected by the Kern Union High School District to act as their Environmental Consultant. SISK will coordinate and develop all plans stated above. SISK will utilize the services and expertise of Pacific Geotechnical Associates, Inc. (PGA), a firm consisting of professional geologists registered by the State of California, to collect soil samples as described in this work plan and to review, approve, and sign all work plans submitted to the county for approval. SITE BACKGROUND The Kern High School District has instituted a.program to eliminate several underground fuel tanks at various locations within the City of Bakersfield. On April 12, 1990, one (1) 1,000 gallon unleaded gasoline underground storage tank and associated dispenser were removed from the southwestern parking lot at South High School (Plate I). Inventory records indicate no loss from the tank prior to removal, but some staining and petroleum odor were observed when the dispenser was removed. Soil "C:I::~%IIIM~ 9(~I-,IFiC'II I::I~,IP! IqVI:I:~: TI-IROI I~1.-I RI::TTI:R RIRI~ samples taken from beneath the. tank indicate no contam£nation, however,, samples taken from beneath the d£spenser contained contam£nat£on levels above, acceptable lim£ts, a cond£t£on which has prompted this s£te character£zat£on work. Depth to groundwater is greater th~as indicated on the Kern County Water Agency map "Depth to Water in Wel s~, September 1989" (attached as Plate II). The topography is relatively flat, and the Central Branch Kern Island Canal lies approximately one-half mile to the east of the site. PRELIMINARY SITE ASSESSMENT RESULTS A total of four (4) soil samples were collected from beneath the tanks by McNabb Construction Company and analyzed by BC Laboratories, Inc. (laboratory reports are attached). A summary of those analyses is as follows: SAMPLE LOCATION LABORATORY ANALYSIS (TPH} 2 feet under tank ........................ None Detected 6 feet under tank ........................ None Detected 2 feet under dispenser ............... ~... 250 ppm 6 feet under dispenser ................... 7,800 ppm The samples retrieved from beneath the tank exhibit "None Detected" levels of Total Petroleum Hydrocarbon (TPH), however, samples from beneath the dispenser location have values in excess of Department of Health Services (DOSH) recommended action levels for soil. Following the removal of the tank, the excavation was backfilled and covered with clean soil (see figures 1, 2, 3, and 4). SOIL SAMPLING PLAN Introduction The following program is designed to assess the vertical and horizontal extent of contamination in the soil for the underground gasoline tank site. The program consists of a minimum of four (4) soil borings. Additional borings will be considered if contamination is laterally extensive. Locations and Depths Plate III shows the approximate location of the soil borings. These are numbered in the order in which they will be drilled. The following rationale was used for location selection: 1) Soil boring #1 will be made directly under the past location of the dispenser. Its purpose is to define the vertical extent of contamination. 2) Soil boring #2 will be located at the approximate center of the former tank location. Soil boring $2 will establish the vertical extent of contamination (if any) below the tank. Soll-.borings~ approximately ten (10) feet and twenty (20) feet, reepect£ve~y-~;i the dispenser and at 120 degree angles from one another to cover-~ the largestpossible area. The purpose of the three latter' borings ls~ to'define the lateral extent of contamination. Boring will cease after two (2) successive soil samples show measured Volatile Organic Compounds (VOC) concentrations of zero (0) parts per million above background on an Organic Vapor Monitor (OVM). OVM readings will be taken before soil boring begins to establish background values. Ail VOC concentrations will be documented on a field boring log which will be submitted to the KCEHS as part of the site characterization re~ort. Destruction of Borings and Spoils Management Ail borings will be backfilled with bentonite clay and capped with concrete. Augered soil not preserved for laboratory analyses will be sealed and stored in 55-gallon drums. Laboratory Analysis, QA/QC Soil samples for laboratory analysis will be collected in brass tubes. After the ends of the sample tubes have been examined for lithology and any visible staining, they will be covered with a Teflon seal and a plastic cap. The cap will be secured with duct tape, and the sample will then be labeled and placed in an ice chest which will maintain the temperature at, or below, 4 degrees centigrade. At the end of the day, all samples will be transported to SMC Laboratories, 3155 Pegasus Drive, Bakersfield, California 93308, a California State Certified Laboratory. Samples will be analyzed for TPH and BTXE using EPA methods 3810/8020. Chain-of-Custody f~rms will be completed when the sample is collected and maintained with each transfer of the sample. Sampling Equipment and Procedures The initial borings will be advanced using an AMS extendable soil recovery auger with a core sampling head capable of retaining a 2-inch by 6-inch brass sampling tube. Cutting samples will be described and recorded on a continuous log. The shoe of the auger head will be field screened with an OVA for VOC's with each sample retrieved. Soil samples will be taken at five (5) foot intervals commencing at fifteen (15) feet below grade in boring #1 and ten (10) feet below grade in borings #2, $3, and #4. In the event that contamination extends below the sampling capability of the extendable auger, the soil boring will be advanced with a truck- mounted, hallow-stem auger. The augers will be steam cleaned at the beginning of work and between each soil boring. Soil samples will be retrieved using a split-spoon sampler and brass tubes, using the-.;Same procedure as described above. Ail sampling equipment and brass tubes will be washed in a non-phosphate detergent and rinsed with distilled water between samples and between each boring. Personnel involved in the site characterization field work will comply with Level D personal protective equipment (boots, hard hats, eye protection). This will be augmented by wearing neoprene gloves when handling samples and sampling equipment. South High School is located at the site and will be used for communication and first aid should an accident or emergency occur. The site will be flagged off to control public access, and all personnel and visitors to the site will sign the site log book each day. REPORT OF FINDINGS A summary report will be prepared by SISK and approved by PGA which will document field procedures, sampling procedures, analytical results, and data analysis. This information will then be used to develop the Site Characterization Report and the Remedial Action Options which will be submitted to the county for. approval. The Site Characterization Report will conform to KCEHS requirements as outlined in "UT-35." RNW/RTM:vrs Enclosures cc: .Janet Shell Sincerely, Rodney N. Williams, Director Safety & Environmental Control Randall T. Metz Pacific Geotechnical Associates, Inc. ~OUTH BUILOINOS ~ ' ~TONWOOD ROAD UNDERGROUND STORAGE TANKS SOUTH HIGH SCHOOL FIGURE 1 UNDERGROUND STORAGE TANKS SOUTH HIGH SCHOOL FIGURE 2 UNDERGROUND STORAGE TANKS SOUTH HIGH SCHOOL FIGURE 3 UNDERGROUND STORAGE TANKS SOUTH HIGH SCHOOL FIGURE 4 PETROL KERN COUNTY WATER AGENCY IMPROVEMENT DISTRICT NO 4 ~KERSFIE LO, CALIFORNIA DEPTH TO WATER IN WELLS SEPT. 1989 SB#4 'MAINTANANCE SHOP SB#3 PARKING 2' - 250 ppm 6' - 7800 ppm ,~B#1 EXCAVATION (backfilled) DISPENSER ..% ;B#2 2'- ND X "~%,6,. ND {~ SB #1 Soil Boring X Sample Location '~ Tank Location \. 2' - 1,700 ppm 6'- ND Depth below tank - ppm TPH ND = Not Detected SOUTH HIGH SCHOOL Plate III PLOT PLAN SeCl. 11.1990 10 FEET I PARKING WOODSHOP GRASS AREA APPENDIX Laboratory Analyses Purgeable Aromat (sozL) McNabb Construction 7808 Alcott Ave. Bakersfield, CA 93308 Attention: Bryan McNabb Lab No.: Sample Desc: 3350-17 'Kern High School District South High School Under Tank 2' Date of.'~ Report: 26-Apr-90 Date Sample Collected: 12-Apr-90 Constituent Benzene Toluene Ethyl Benzene p-Xylene m-Xylene o-Xylene Total Petroleum Hydrocarbons (Gasoline) Reporting Units Date SamPle Received @ Lab: 12-Apr-90 Date Analysis Completed: 24-Apr-90 Minimum Analysis Reporting Results Level ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.8 TEST METHOD: TPH by D.O.H.S. / L.U.F.T. method. Individual constituents by Modified EPA method 5020/8020. As Received Basis Comments: California D.O.H.S. Cert. #102 By { Anary-t PUrgeable Aromatics (SOIL) McNabb Construction 7808 Alcott Ave. Bakersfield, CA 93308 Attention: Bryan McNabb Lab No.: Sample Desc: 3350-18 Kern High School District South High School Under Tank 6' Date of Report: 26-Apr-90 Date Sample Collected: 12-Apr-90 Constituent Benzene Toluene Ethyl Benzene p-Xylene m-Xylene o-Xylene Total Petroleum Hydrocarbons (Gasoline) Reporting Units Date Sample Received @ Lab: 12-Apr-90 Date Analysis Completed: 24-Apr-90 Minimum Analysis Reporting Results Level ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.02 ug/g none detected 0.8 TEST METHOD: TPH by D.O.H.S. / L.U.F.T. method. Individual constituents by Modified EPA method 5020/8020. As Received Basis Comments: California D.O.H.S. Cert. #102 By McNabb ~onstruction 7808 AlCott Ave. Bakersfield, CA Attentign: Lab No.~ Sample Desc: Date Sample ColleCted: l~-Apr-90 Constituent -. Put'cable Aromati~S~ (SOIL) Date.~ of?~ ' Report :' 93308 Bryan McNabb ~ ~n High School District ~outh High School ~ Date Sample Date Analysis Received ~ Lab: Completed: 12-Apr-90 24-Apr-90 26-APr-90 ,, Minimum Reporting Analysis Reporting Units Results Level Benzene; ug/g 0.08 0.08 Toluene ug/g 3.9 0.08 Ethyl Benzene ug/g 3.2 0.08 p-Xylene ug/g . 7.8 0.05 m-Xylene ug/g 18 0'.08 0.08 o-Xylene ug/g 12 ~ ~~ 250 Total petroleum Hydrocarbons (Ga~oline) ug/g 4 TEST METHOD: TPH by D.O.H.S. / L.U.F.T. method. Individual constituents by Modified EPA method 5020/8020. As Received Basis Comments: California D.O.H.S. Cert. #102 By Analyst McNabb Construction 7808 Alcott Ave. Bakersfield, CA 93308 Attention:' Bryan McNabb (so~L) Date of Report: 26-Apr-90 Lab No.: Sample Desc: Date Sample Collected: 12-Apr-90 Constituent Benzene Toluene Ethyl Benzene p-Xylene m-Xylene o-Xylene Total Petroleum Hydrocarbons (Gasoline) 3350-20 Kern High School south High Schoo~ Date Sample Received @ Lab: 12-Apr-90 Date Analysis Completed: 24-Apr-90 Minimum Reporting Analysis Reporting Units Results Level ug/g 15 5 ug/g 56 5 ug/g 51 5 ug/g 180 5 380 5 ug/g ~@~ @~1~ 3 7 0 5 ug/g .. ug/g 100 TEST METHOD: TPH by D.O.H.S. / L.U.F.T. method. Individual constituents by Modified EPA method 5020/8020. As Received Basis Comments: California D.O.H.S. Cert. #102 By Analyst ""~-~ific Geotechnical Associates, Inc. { 4200 Easton Drive, Ste. 2 · Bakersfield, Calif. 93309 ° (8[]5_) 324~7768 SOUIt-I HIGH SCHOOL SITE CHARACTERIZATION WORKPLAN AMMENDMENT fic Geotechnical Associates, Inc. [ 4200 Easton Drive, Ste. 2 · Bakersfield, Calif. 93309 · (805) 324-7768 Ms. Flora Darling Hazardous Materials Specialist Environmental Health 'Services Dept. County of Kern 2700 "M" Street, Suite 300 Bakersfield, CA 93301 January 15, 1991 Re; South High School Site Characterization Permit #: 310009 Dear Ms. Darling: On October 25, 1990, a site characterization workplan for the above referenced site was submitted to the Environmental Health Services Department for your approval. Your response, dated November 8, 1990, was a series of comments to be addressed before approval (copy attached). This letter contains responses to each comment and serves as an amendment to the original proposed work plan. Comment 1. Additional borings shall be within a 15 foot radius of boring #B1 situated over the former dispenser ~area. Response 1. As indicated in our work plan, SB#2 and SB#3 will be located within approximately ten feet of SB#1. If necessary to adequately characterize the site, additional borings will be made at a greater distance from SB#1. The locations of all borings subsequent to boring SB#1 will depend on field conditions and findings, and will be determined in the field by the project geologist with the concurrence of a representative from the Environmental Health Services Department (see paragraph 2.0 of the attached Quality Assurance/Quality Control Procedures). Comment 2. A slant boring will be necessary in order to determine if contamination has migrated beneath the maintenance shop. Response 2. Vertical borings are an efficient and safe way to determine whether or not contamination has migrated beneath the maintenance shop for the following reasons: Plume with a major component beneath the 'maintenance-:~l/t~P~'?.?""ThO.~.' migration of fluids through a porous media is powered by gravity ~md capillary pressure. Unless a contamination plume strikes- an impermeable inclined plane, it will go straight down with a small component of horizontal expansion. When encountering an impermeable inclined plane, the plume will "drift" in a down dip direction. At the South High School site, the strata are relatively flat. A contamination plume will tend to be radially symmetrical with respect to the vertical axis. Therefore, three or more borings at increased distances from the axis of the plume (under the dispenser) should characterize the shape of the plume. If an impermeable or semipermeable horizon is encountered during'the initial borings, the attitude of the bed will be determined in the field, and if the dip is in the direction of the maintenance shop, a decision can be made at that time to advance a slant boring. b. Unnecessary slant drilling adds an unnecessary safety risk to the project. Truck mounted augers are designed to operate optimally with the mast in the vertical position. The. mast can be tilted to perform slant boring, but unusual stresses are placed both on the equipment and the operators. In addition, boring beneath buildings poses the risk of encountering buried pipes and wiring, footings, and any. other unseen objects that may be beneath the structure. For these reasons the following boring program is proposed: The South High site borings will be positioned immediately adjacent to the maintenance 'shop (see Figure 2), and if an impermeable, or semipermeable horizon is encountered, its depth below grade will be plotted in each boring on a map. The attitude of the bed will be determined using the three-point method, and if necessary a slant boring beneath the maintenance shop will be located in the field by the project geologist with the concurrence of a representative from the Environmental Health Services Department (see paragraph 2.0 of the attached Quality Assurance/Quality Control Procedures). Comment 3. deleted. Submit a revised plan view - boring SB#4 and SB#2 may be Indicate slant boring. Response 3. Attached is a revised plot plan (Figure 2) showing anticipated boring locations. Boring SB#2 has been relocated approximately seven feet northwesterly of SB#1 and is adjacent to the maintenance shop. Boring SB#4 may be deleted, pending outcome of the other three borings. PACIFIC GEOTECHNICAL ASSOCIATES, INC. .For comments, about slant boring,~ please--see~ Response:.,.2;-~;.abOVe~ ..... Comment 4. rinsate. Address disposal and characterization of drilling spoils and Response 4. All soil not preserved for laboratory analysis will be placed in a 55-gallon d~um which will be sealed, labeled, and temporarily stored at the site. All rinsate will be placed into the drum along with the drill cuttings. When the drum is full a representative sample will be retrieved using a soil sampling device. The sample weighing at least two pounds will be placed in a glass sample jar, leaving no head space. A teflon sheet will be placed over the mouth of the jar, the lid will be firmly secured and sealed with tape. The sample will be sent to Laidlaw Environmental Services, a state registered waste hauler, for analysis. A copy of the analysis will be included in the final site characterization report. Upon completion of laboratory analysis, the drum will be transported by Laidlaw to a state approved hazardous waste disposal site. Comment 5. A. complete Health and Safety Plan is required. OSHA regulations. Follow Response 5. See attached Health and Safety Plan, South High School. Comment 6. the field. Depth of borings other than SB#1 will be determined in Response 6. See paragraph 2.0 of the attached Quality Assurance/ Quality Control Procedures. Comment 7. Use unified soil classification system. Lithology logging shall be accomplished in the field by a geologist under the supervision of a registered geologist or registered civil engineer. All data shall be interpreted by the above defined qualified professional. All reports shall be submitted to this office for review. Response 7. The procedures mentioned above will be included in the work plan. Comment 8. Boring holes will be abandoned by filling with cement sand slurry. A bentonite plug may be placed at the lower 5 foot level. Response 8. All borings not completed as .monitoring wells will be backfilled with cement. Borings advanced using the truck mounted PACIFIC GEOTECHNICAL ASSOCIATES, INC. will be abandoned by backfilling with auser implaccd' with', a trcmic, pipe (sec' paragraph~'2'~O'~i't{f~c/he~//ttaCh~i~.~t{~i~.:~?-~i Assurance/ Quality Control Procedures). Comment 9. grade. Soil sampling must commence at 5 foot intervals below Response 9. Soil samples for analyses will be retrieved at five foot intervals beginning at five feet below grade and at any change in lithology (see paragraph 3.0 of the attached Quality Assurance/Quality Control Procedures). If you feel it is necessary, we will be happy to meet with you in person to discuss the procedures outlined in our workplan and in the attached amendments to the work plan. Respectfully submitted, Rod Williams attachments: EHSD Ltr dtd 11/8/90 QA/QC Plan Health & Safety Plan Statements of Qualifications PACIFIC GEOTECHNICAL ASSOCIATES, INC. DIRECTOR DAVID PRICE II! ASSISTANT DIRECTOR REsouRCE.: MANAGEMENT: ? ~ ~ ~ ~. ~DDY, ~O ~ ~, ~CP, DIRECTOR ENVIRONMENTAL HEALTH SERVICES DEPARTMENT November 8, 1990 Rodney N. Williams (Sisk) Kern County Superintendent of Schools P. O. Box 9939 Bakersfield, CA 93389 Subject: Location: Known As: Permit #: 1101Planz Road, Bakersfield, CA South High School 310009 Dear Mr. Williams: Our Department has reviewed the site characterization workplan for the above referenced facility.' Additional information and revisions are needed before approval to commence work may be granted: Additional borings shall be within a 15 foot radius of boring #B1 situated over the former dispenser area. e A slant boring will be necessary in order to determine if contamination h'as migrated beneath the maintenance shop. Submit a revised plan view - boring SB #4 and SB #2 may be deleted. Indicate slant boring. 4. Address disposal and characterization of drilling spoils and rinsate. 5. A complete Health and Safety Plan is required. Follow OSHA regulations. 6. Depth of borings other than SB #1 will be determined in the field. Use unified soil classification system. Lithology logging shall be accomplished in the field by a geologist under the supervision of a registered geologist or registered civil engineer. All data shall be interpreted by the above defined qualified professional. All reports shall be submitted to this office for review. 2700 "M" STREET, SUITE 300 BAKERSFIELD, CALIFORNIA 93301 (805) 861-3636 FAX: (805~ 861-342~ Rodnew~N...W~4J~iams~ *NovemberS, I990 Page 2 Be Boring holes will be abandoned by filling with cement sand slurry. A bentonite plug may be placed at the lower 5 foot level. g. Soil sampling must commence at 5 foot intervals below grade. Upon receipt of the above requested items our Department will be able to. continue the review. If you have any questions, contact me at (805) 861-3636 extension 549. FD:cas Sincerely, F1 ora Darling, R.E.H.S. j Hazardous Materials. Specialist Hazardous Materials Management Program \310009.ltr QUALITY ASSURANCE/QUALITY CONTROL PROCEDURES SOUTH HIGH SCHOOL BAKERSFIELD, CALIFORNIA 1.0 PURPOSE This study has been undertaken to characterize the soil at an underground fuel tank site at South High School (Figure 1). Procedures used in the field will generally follow guidelines contained in the State Department of Water Resources guidance document entitled "L.U.F.T. Field Manual" dated May 24, 1988. The field activities will meet or exceed the requirements of the Kern County Environmental Health Services Department's requirements as outlined in its handbook UT-3$. 2.0 BORINGS Exploration will consist of drilling at least three vertical borings to a sufficient depth to achieve two consecutive five-foot soil samples showing zero PID reading (above background). The depth of each boring will be determined in the field by the project geologist with the concurrence of a representative from the Environmental Health Services Department. If perched ground water is encountered before the above criterion is met, boring will cease eight feet below the depth ground water is first encountered. The borings will be positioned immediately adjacent to the maintenance shop (see Figure 2), and if an impermeable, or semipermeable horizon is encountered, its depth below grade will be plotted in each boring on a map. The attitude of the bed will be determined using the three-point method, and if necessary a slant boring beneath the maintenance shop will be located in the field by the project geologist with the concurrence of a representative from the Environmental Health Services Department. 1 / 1 /9 :~ ' Thc locations of ~o drill holes ~re'-2) will bo~'~ot~.od~?~b~:-~. measurement from known facilities, ~d elevations wilI topographic map. The locations ~d elevations of the drill hole~~ ~hould be' considered accurate only to the degree implied by ~e me. od used. Borings will be advanced using an AMS extendable soil recovery auger with a core sampling, head capable of retaining a 2-inch in diameter by 6-inch long brass sampling tube. The maximum penetration depth of the hand auger is approximately 21 feet. In the event that deeper borings are required to successfully complete the site characterization, a truck mounted, hollow stem flight auger will be employed. After drilling to the depth reached by the hand auger, a Modified California split-spoon sampler will be used to obtain undisturbed soil samples. The sampler consists of a 3.0-inch outside diameter, 10-inch long, steel sampler which contains up to four, 3-inch long brass sampling sleeves. All drill bits and auger stems will be cleaned prior to the drilling of each hole to prevent cross-contamination. Each boring will be logged by a PGA staff geologist who will also monitor drill cuttings for organic vapor concentrations with a PID with a 10.6 electron volt light source probe. The PID will be calibrated with calibration gas prior to the start of each day's work. Logs of the drill holes containing information regarding earth materials encountered, depths and elevation of samples obtained, and the results of field testing will be prepared. Log preparation will be supervised by PGA geologists registered by the state of California. 3.0 SAMPLES Prior to the collection of each sample, sampling equipment will be washed the a nonphosphate detergent solution, triple rinsed with distilled water, and air dried. Soil samples for analyses will be retrieved at five foot intervals beginning at five feet below grade and at any change in lithology. QA/QC Page 2 ~ ~...':, ~ :~.,F~.~.~;~/::~-~· -~ Immediately.. after sampling,, staple * sleeves- will -~.. bo :.~. sc~cd,, ~.wi~;,. ,Tcfl°s~ .shccts~ ~d ~r-tight caps, taped, labelled, and placed in a cooler containing artificial. ice ~d kept at or below 4°C. Chain-of-Custody fores will be completed when the staple is collected ~d maintained wi~ each transfer of ~e staple. If groundwater is encountered, a water sample will be retrieved using a disposable bailer. The fluid sample will be sealed in a labeled, glass sample jar and stored in an ice chest and kept at or below 4°C. Chain-of- Custody forms will be completed when the sample is collected and maintained with each transfer of the sample. At the end of each day, all samples will be transported to SMC Laboratories, 3155 Pegasus Drive, Bakersfield, California, 93308, a California state Certified Laboratory. Soil samples will be analyzed for TPH and BTXE using EPA methods 3810/8020, and fluid samples will be tested using EPA 601- 602 for water.. 4.0 SPOILS DISPOSAL AND BORING DESTRUCTION All soil not preserved for laboratory analysis will be placed in a 55-gallon drum which will be sealed, labeled, and temporarily stored at the site. Al! rinsate will be placed into the drum along with the drill cuttings. When the drum is full a representative sample will be retrieved using a soil sampling device. The sample weighing at least two pounds will be placed in a glass sample jar, leaving no head space. A teflon sheet will be placed over the mouth of the jar, the lid will be firmly secured and sealed with tape. The sample will be sent to Laidlaw Environmental Services, a state registered waste hauler, for analysis. A copy of the analysis Will be included in the final site characterization report. Upon completion of laboratory analysis, 'the drum will be transported by Laidlaw to a state approved hazardous waste disposal site. All borings not completed as monitoring wells will be backfilled with cement. Borings advanced using the truck mounted auger will be abandoned by backfilling with cement sand slurry implaced with a tremie pipe. QA/QC Page 3. 1/15/91. * ! *. Soutl~Hfi~ ~S Depth to ground water is greater than 170 feet as indicated on Kern County Water Agency map "Depth to Water in Wells, Sept. 1989." 'If contamination . is found on ground water, three monitoring wolls will installed. Kern County Environmental Health Se~ices Depa~ment will notified and water well pemits will be secured immediately after penetration of the water table. The exact construction of the monitoring wells will be subject to findings during drilling of the soil borings. The soil borings will be completed with flush threaded schedule 40 PVC pipe. The completion interval will consist of gravel packed, flush threaded schedule 40 PVC liner with 0.020-inch manufactured slots. A three foot bentonite annular seal will be placed above the slotted liner. Cement grout will be placed around casing from the annular seal to the surface. The completion interval will be 15 feet, half of which will extend below the water table and half above. A 4-inch diameter completion will be made if the well is considered to be a potential remediation candidate. Otherwise, a 2-inch well completion will be made. The completion interval in soil boring #2 may be extended to within five feet of the surface to allow for alternative 'remediation options. QA/QC Page 4 -N- SOUTH HIGH SCHO LOCATION SB#4 (if needed) PARKING SB#2 MAINTENANCE SHOP SB#3 DISPENSER 2' - 250 ppm 6' - 7800 ppm EXCAVATION (backfilled) WOODSHOP ~ SB #1 X Soil Boring Sample Location 2' - 1,700 ppm 6'- ND Tank Location Depth below tank - ppm.TPH ND = Not Detected SOUTH NIGH SCHOOL Figure 2 laLI T I LAN (Revised 12/10/90) 10 FEET ~cl: 1 ~S/~0 PGA -N- PARKING (Asphalt covered) GRASS AREA HEALTH AND SAFETY PLAN SOUTH HIGH SCHOOL BAKERSFIELD, CALIFORNIA 1.0 PURPOSE The purpose of this plan is to provide for worker and environmental Health and Safety during underground fuel tank site characterization at South High School, Bakersfield, Kern' County (Figure 1). This project will be conducted by Self Insured Schools of Kern (SISK) and Pacific Geotechnical Associates, Inc. (PGA). 2.0 SITE HISTORY In accordance to the Kern County Environmental Health Services, SISK is submitting this Health and Safety Plan to guard worker safety at the site. Soil contamination was documented during removal of an underground fuel tank by McNabb Construction Company. Soil samples taken two feet and six feet below the dispenser recorded 250 and 7,800 parts per million Total Petroleum Hydrocarbons respectivel·y. After the tank was removed the excavation was backfilled with spoils. The excavation was not lined prior to backfilling. The Site Characterization Work Plan to which this Health and Safety Plan applies calls for at least three boring for the purpose of obtaining undisturbed samples for laboratory analysis. The planned list of work is summarized in the following tasks: Task 1: Preparation of a Site Characterization Work Plan and this Health and Safety Plan. Task 2: Drill at least three soil borings to depths sufficient to characterize the contamination plume. Undisturbed soil samples will be collected at 5-foot intervals. Each boring will be geologically logged and monitored for hydrocarbon vapors with a portable photoionization detector (PID). Soil borings will be destroyed by filling with cement. All drilling spoils and rinsate will be sealed in 55-gallon drums and transported to a certified hazardous waste disposal facility. Task 3: The soil samples will 'be submitted to SMC Laboratories for chemical analysis for TPH and BTXE using EPA method 8020. · 1/1519! Task~-4: ~ ~- -: prepare,~ and~ submit, a technicaL/report-~.~ summanzin of the site' characterization including, .but not limited and interpretations of data, discussion of descriptions and remedial action options including a recommended option and risk appraisal. 3.0 EMERGENCY CONTACI~ In the event of an emergency occurring during the characterization program, the following emergency facilities are available: Police Call 911 Fire 911 or 631-8421 Fire Station No. 5 700 W. Planz Rd. (east on Planz Rd. 4 blocks) Ambulance 911 Hospital - Mercy Hospital. 2215 Truxtun 327-3371 (west on Planz 1/2 mile, north on H Street 3-1/3 miles, and west on Truxtun 1/3 mile) A telephone is located inside the Maintenance Shop (Figure 2). In case an emergency occurs, the following procedures should be implemented: Minor Cuts or Abrasions. Wash affected area with soap and water and bandage. A first aid kit with eye wash solution must be located on site. The site safety officer is basic first aid trained. S~rious Physical Injury. In the event of serious physical injury: a. Call immediately for ambulance or medical assistance. b. Follow protocols established in the Medical Emergency Reference Manual #1 (Emergency Medical Planning, Inc.) until assistance arrives. The site safety officer is basic first aid trained. c. If an ambulance is not available, transport victim to nearest hospital (Mercy Hospital). H & S Page 2 1/15/91 ", .'~ '-Thc,:((, folloWing,~ :~ information.,.-:, must.'. ~' bc~q::rccordcd% by?thc%project, ii:',: cnginccr or sitc safcty officer for any cmcrgcncy situation as soon as possiblc:.: · ao Notifier's name. Datc, timc, and location of the incident. Nature of emergency (describe what happened). Type and amount of materials involved. Extcnt of injuries, if any. Agencies and/or organizations notified, names of people notified. Actions taken. 4.0 PERSONNEL The following personnel are expected to be at the site during the assessment project: SISK PGA Drilling Operator Kern County (EHS) Rod Williams Randall Metz and/or Brian Hirst (unknown at time of publication) Flora Darling Mr. Rod Williams is designated as site safety officer and will be responsible for ensuring compliance with this plan at all times. Mr. Williams has completed the 8-hour Health & Safety Supervisors Training course. Mssrs. Williams, Metz and Hirst have completed the necessary 40-hour Health & Safety Training requirements. Drilling personnel will also have the necessary Health & Safety training. Personnel access to the work zone will be limited if Level C personnel protective equipment are required. Only personnel properly equipped with Level C equipment (see Section 10.0 below) will be allowed to enter the contaminated zone. SISK will provide Level C equipment for only SISK, PGA and the drillers. 5.0 WASPS The contaminant to be encountered at the site is gasoline. The specific hazardous substances that are likely to be encountered are shown in Appendix A. Applicable exposure data for these substances are presented in Table 1 Hazardous Substances Data. Symptoms of exposure and first aid treatments for each chemical are presented in Table 2 Exposure Symptoms and First Aid Treatment. As listed in Table 1, the lowest permissible short-term exposure limit (STEL) concentration is 5 ppm (for benzene). This concentration will be used to establish the requirement to don Level C personnel protective equipment (see Section 9). Contaminated boring spoils and rinsate will be sealed in 55-gallon drums, labeled and stored on site pending sample analyses and acceptance by a licensed waste disposal facility. H & S Page 3 Chemical hazards could be encountered from direCt.. with the contaminated soils or breathing volatilized chemicals, in' the` air:.. Level D equipment includes standard work clothing and gloves~ which would reduce direct skin contact with chemical encountered (sec Section 5). A photoionization detector (PID) will be in continuous use in the breathing zone and if organic vapor concentrations of 5 ppm above background arc detected, Level C equipment will be donned by all personnel in thc contaminated zone. Thc respirator should protect workers from inhaled contaminants. Weather conditions have the potential to disrupt the project in that if it is raining, drilling and sampling should be postponed. It is unlikely that temperature conditions would preclude completion of the project. Temperature ranges expected to be encountered are 50°F to 70°F. Underground electrical and water utility lines are buried one to two feet below the surface along the sidewalk and west of the site. Care must be taken to avoid encountering these lines. The top three to four feet of soil will be penetrated with a hand auger to ensure the boring location is not over a utility line. 7.0 RISK ASSESSMENT The potential for adverse health or safety risks to the on-site workers or the immediate surrounding area is low. Concentrations of the hazardous substances encountered in the previous assessment at the site have been low, and it is unlikely that high concentrations will be encountered especially considering that the source of contamination, the underground 'fuel tank, has been removed. Since the site is located outdoors, the atmospheric dispersion of contaminants will be significant. Special arrangements for possible school evacuation should not be required. No authorized personnel may be permitted to stand near the boring location during site characterization. If students, school employees or any other non-essential personnel enter the work site, they will be informed that health and safety procedures have been established to protect both the workers and the public. If they refuse to leave, school administrators will be contacted. 8.0 EXPOSURE MONITORING A PID will be in continuous use during drilling operations. The ionization constants for all of the substances likely to be encountered (benzene 9.24eV, ethylbenzene-8.76eV, toluene-8.2eV and xylene-8.56eV) are all within the detection range of the PID (less than 10.2eV). If the organic vapors in the breathing zone detected by the PID exceed 2 5 ppm above background levels (to be measured prior to excavation and up-wind of the site) for more than five minutes, the personnel in the contaminated zone will don Level C protective equipment, including respirators. Level C equipment will H & S Page 4 1115191'- . . . TABLE 1 HAZARDOUS SUBSTANCES DATA (all in ppm) Substance Benzene Ethylbenzene Toluene Total Xylene PELa 1 100 100 100 STELb 5 125 150 15 0 IDLHc Carcinogen 2,000 2,000 1,000 Odor Thresholdd 1.4 2.0 2.1 NEe LEL/UELf (in %) 1.3/7.1 1.0/6.7 1.2/7.0 1.1/7.0 Max. Levels at site 26 130 370 730 a (1987 b C Permissible exposure limit in air for 8-hour day as established by ACGIH update) Short-term exposure limit in air for 15,minute period as established by ACGIH (1987 update) Immediately dangerous to life or health from NIOSH Pocket Guide to Hazardous Substances (1985) As adapted for AIHA Journal (1987) Not Established Lower Explosive Limit/Upper Explosive Limit from NIOSH Pocket Guide to Hazardous Substances (1985) H & S Page 5 · . 111'5/91 TABLE 2 EXPOSURE SYMPTOMS AND FIRST AID TREA~ Chemical Route(s) of Entry General Symptoms First Aid Treatment Benzene Inhalation, Inges- tion, Contact Ethylbenzene Inhalation, Inges- tion Toluene Inhalation, Skin Absorption, Inges- tion, Contact Xylenes Inhalation, Skin Absorption, Inges- tion, Contact Odor - Aromatic Upper respiratory and GI tract irritation, muscle spasms, slow pulse, extrasystoles, hypokalemia irri- tated eyes, skin burns EYES - Irrigate im- mediately for 15 minutes SKIN - Water flush immediately BREATHING - Art- ificial respiration and move to fresh air. INGESTION - Medical attention immediately Odor - Aromatic Irritated eyes and' mucous membranes headaches, dermatitis narcosis, coma. Same as benzene Odor - Aromatic Fatigue, weakness, confusion, euphoria, dizziness, headache, dilated pupils, lacrima- tion, nervousness, muscle fatigue, insomnia, paresthesia dermatitis, photopia Same as benzene Odor - Aromatic Same as benzene Dizziness, excitement drowsiness, incoordina- tion, staggering gait, irritated eyes nose or throat, corneal vacuolization, anorexia, nausea, vomiting, abdominal pain, dermatitis H & S Page 6 concenirafions are. below J ppm above back~round. ' If' ~ID, .conceniraflOns~: mcasu~d in ~c brca~in~ zonc cxcccd 1,000 '~m-above b~k~ro~d,..~e¥'sitc. area will bc cvacuaicd immcdiaicly. ~ccnt~ will noi be allowcd until. concentrations arc below 1,000 ppm or Level B cquipmeni is provided. Care will be t~cn in opcrafin~ ~e PID to avoid monitofin~ vehicle cxhausL 9.0 PERSONNEL PROTECTIVE EQUIPMENT Level D equipment will be required at all times that the PID measured concentrations are below five ppm above background. Level D equipment includes: · hard hats · safety boots · eye protection (safety glasses or goggles) · neoprene gloves (while handling samples) If organic vapor concentrations equal or exceed five ppm above background, all personnel in the contamination zone (see Section 10) will don Level C equipment and remain in Level C equipment until organic vapor concentrations are reduced to below five ppm above background. Level C equipment includes Level D equipment plus: · half-face respirator equipped with combination organic vapor/dust cartridges · tyvek suits SISK will provide Level C personnel protective equipment for its own representatives. If Level C equipment is required, only personnel equipped with Level C equipment will be allowed to enter the contaminated zone, which includes the immediate working area. Anyone other than the SISK representatives and the drillers who desires entry into the exclusion zone under Level C conditions will be required to provide his/her own Level C personnel protective equipment and demonstrate applicable qualifications. The site safety officer or the designated assistant will ensure that no one without proper personnel protective equipment enters the exclusion zone under Level C conditions. Level C equipment provided by SISK will be stored in the SISK vehicle when not in use. 10. WORK ZONES Two basic work zones will be established for this project: a restricted zone (exclusion zone) encompassing the drilling area and a clean zone. Only the exclusion zone may be formally delineated by a tape barrier. The decontamination zone and clean zone will be separated by function only. Final zone boundaries will not be delineated. H & S Page 7 All 'perso~el who hnve been defined in Section 10 nbove shnll undergo person~- · when leaving the exclusion zone for coffee or lunch breaks; · at the end of the work day. The decontamination station shall include the steps listed in Table 3 Personnel Decontamination. Steps pertaining to equipment that is not in use (e.g., respirators) may be eliminated. TABLE 3 PERSONNEL DECONTAMINATION Decontamination Equipment 1. Outer glove and 1 boot removal 2. Air purifying respirator 1 3. Hand wash 1 4. Hand rinse and dry 1 plastic drop cloth. Set equipment on plastic, wash in soap solution, rinse and dry. plastic drop cloth. Lay equip- ment down, wash in soap solution, rinse and dry. 3- to 5-gallon bucket. Liquid hand soap. 3- to 5-gallon bucket. Paper towels. TABLE 4 EQUIPMENT DECONTAMINATION Decontamination Steps Equipment 1. High pressure steam rinse 2. Inspect visually 3. High pressure steam rinse as necessary Steam n/a Steam generator generator H&S Page 8 The, following, general, safety procedures':.: shall,: be:, per.sons entering and/or working in the designated work zones:. · No employee or subcontractor may be allowed on-site without the prior knowledge, and consent of the site safety officer. All personnel at the site shall be advised of the site safety requirements as discussed in this plan. · All contractor or subcontractor personnel shall bring to the attention of thc site safety officer or resident project representative any unsafe condition or practice associated with thc work activities that they arc unable to correct themselves. · There will bc no smoking, eating, chewing gum, or drinking the contamination zone. · Hands shall bc thoroughly cleaned prior to smoking, caring, or other activities outside the contamination zone. · Team members must avoid unnecessary contamination (i.e., walking through known or suspected "hot" zones or contaminated puddles, kneeling or sitting on thc ground, leaning against potentially contaminated barrels or equipment, etc. · Respiratory devices may not bc worn with beards, long sideburns, or under other condition that prevent a proper seal. 13. PLAN ACCEPTANCE All personnel involved with this project are required to read this Health and Safety Plan and sign in the space below that they have read this plan and understand its requirements. Prior to beginning work on the first day of the project, the site safety officer shall conduct a site safety meeting to explain the requirements o this plan and unsure that all personnel are familiar with it. Site safety meetings shall be held at the beginning of each work day of the project. Name Affiliation Date Name Affiliation Date H & S Page 9 Name Date Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Affiliation H & S Page 10 PACIFIC' GEOTECHNICAL ASSOCIATES, INC.: QUALIFICATIONS SOUTH HIGH SCHOOL BAKERSFIELD, CALIFORNIA 1. PACIFIC GEOTECHNICAL ASSOCIATES, INC. Pacific Geotechnical Associates, Inc. (PGA) is comprised of experienced geologists and geophysicists consulting in Bakersfield. Our list of current clients includes the Kern County Water Agency, Tejon Ranch Company, Arco Oil & Gas, Texaco U.S.A., Santa Fe Energy Resources and several smaller clients. PGA is currently involved in a shallow structure mapping project covering the entire San Joaquin valley in Kern County. Over the last two years PGA has been involved as principal investigator in several site assessments and site characterizations. Recent site characterizations that have been accepted by the KCEHSD include the City of Bakersfield, Fire Station No. 1 and A & H Motors (phase II pending). 2. PACIFIC GEOTECHNICAL ASSOCIATES, INC. EMPLOYEES Randall T. Metz holds a Bachelor of Science degree in Geology from California State University, Long Beach, and is a candidate for a Master of Science degree in Geology from the same institution. Mr. Metz is California state Registered Geologist No. 3995. He has received hazardous waste operations and emergency response training including the current year 8-hour refresher course (29 CFR 1910.120). as TennecO;' '0i¥~ C0mpa~Y!s:- Pacific Coasi 'DivisiOn's where he 'was responsible, for technical development~'.'and~' professional geologists as well as for budgetary and administrative' Metz has published several articles on California geology, and is principal author of two site characterization repons which have been accepted by the KC£HSD. He is President-Elect of the San loaquin Geological Society. Brian M. Hirst received a Master of Science degree in Geology from Northern Illinois University in 1976. Mr. Hirst is California state Registered Geologist No. 4583. He has received hazardous waste operations and emergency response training including thc current 'year refresher (29 CFR 1910.120). Mr. Hirst has worked as both an exploration and development geologist at Tenneco Oil Company, where he held the position of Project Geological Engineer before becoming a consultant in 1988. As an environmental consultant, Mr. Hirst has worked on federal RCRA site characterizations, clean closures of disposal sites, ground water monitoring, and contaminated soil remediation. His expertise in California geology led to the publication of several professional articles. He has presented papers for the American Association of Petroleum Geologists, Pacific Section, and led field trips for the San Joaquin Geological Society. Melton Drilling has been a contractor in the San Joaquin Valley since 1968. During that time they have drilled over 500 borings of the type contemplated for the subject site characterization. SMC Laboratory located in Bakersfield is a State certified analytical laboratory experienced in the type of analyses indicated above. PGA Qualifications Page 2 October 11, '1991 Ms. Flora Darling Environmental Health Serv. Dept. 2700 "M" Street Suite 300] Bakersfield.,, CA 93301 / Re: Sit~ Characterization Report Sodth High School Dear Ms ©arling: Attached for your consideration is Pacific Geotechnical Associates, Inc's .Site Characterization Report for the subject site submitted on behalf of the Kern High SchOol District, Permit No. 310009. Per UT i Handbook 35 guidelines, remediation alternatives are discussed including! a "no action" option. This report recommends either of two · alternatives: 1) 2) Soil venting with vapor scrubbing using carbon adsorbers with the positioning of vent wells so as to enhance the natural degradation of the I · contaminant, and Valpor extraction and incineration using a trailer-mounted internal combustion engine. The former has the least technical risk and has the greatest potential to exceed expectatio'n. The latter recommendation may be accomplished within two months, l~ut carries with it greater potential for complication and may be more expensive than planned. As always, we will be happy to meet with you to discuss this report and our recommendations. Respectfuilly submitted, Steven H. Lewis, Project Geologist. i:pld ' SHL/RTI~ Encl. cc: A. Marinello, KHSD "'"~c Geotechnical Associates, Inc. ifi¢! 4200 Eaton Drive, Ste. 2 · Bakersfield, Colif. 93309 · (80,5) 324-7768 SOUTH HIGH SCHOOL SITE CHARACTERIZATION REPORT Submitted on behalf of KERN HIGH SCHOOL DISTRICT by Pacific Geotechnical Associates, Inc. October 11, 1991 South High. school~Site Characterization '~ ~ i:O/.M191. 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 TABLE OF CONTENTS' Introduction .................................................................................................... 1 Project Description ....................................................................................... 1 2.1 Site History ........................................................................................ ,1 Purpose and Scope ....................................................................................... 2 3.1 Introduction ........................................................................................ 2 3,2 Soil Sampling Procedures .............................................................. 2 Findings ...................................................................................................... 3 4.1 Soil Profile ........................................................................................... 3 Evaluation ...................................................................................................... 4 5.1 Introduction ........................................................................................ 4 5.2 Dispenser Site ..................................................................................... 4 5.3 Groundwater ....................................................................................... 5 Conclusions ................................. 2 ................................. ; .................................. 6 6.1 Introduction ........................................................................................ 6 6.2 Findings ................................................................................................ 6 6.3 Risks ....................................................................................................... 6 Remedial 7.1 7.2 7,3 7.4 7.5 Action Options ........................................................................... 7 Introduction ........................................................................................ 7 Option 1/ No Action (Natural Biodegradation) .................... 7 Option 2/ Passive Ventilation ..................................................... 8 Option 3/ Vapor Extraction and On Site Incineration ........................................................................................ 9 Option 4/ Excavation, Disposal and Backfill with Clean Soil .............................................................................................. 1 0 7.6 Recommendation .............................................................................. 1 0 Statement of Qualifications .................................. , ................................... 1 1 Closing ...................................................................................................... 1 2 PACIFIC GEOTECHNICAL ASSOCIATES, lNG. i i Sou~ High 'School ~tc~Charactcdzation U t. '"on" TABLE OF CONTENTS, LIST OF ILLUSTRATIONS Figure 1 -Figure 2 Figure 3 South High School Site Location Map Plot Plan ShOwing Preliminary Site Assessment Results and Soil Boring Locations and Cross Section Transect Cross section A - A' APPENDICES Appendix A Appendix B Appendix C Logs of Soil Borings Laboratory Results Chain of Custody Documents PACIFIC GEOTECHNICAL ASSOCIATES, INC. i i i South High ' Schoolqte Characterization 1.0 Introduction,- This report details site characterization studies conducted at South High School grounds, 1101 Planz Road, Bakersfield, California (Figure 1) on July 23rd, 1991 by Pacific Geotechnical Associates, Inc. (PGA). The work was contracted by Kern High School District. The purpose of this work was to determine the vertical and lateral extent of product plume(s) resulting from a leaking fuel dispenser (which, along with an underground tank, had been removed), assess the potential environmental impact of the contamination and propose at least three remediation options which are compatible with the nature of the contamination plume and the surrounding cultural conditions at the site. This report contains background information regarding the site, a description of the study methodology, and subsequent findings. An evaluation with conclusions and recommendations for site remediation alternatives are also discussed. The appendices to this report contain a log of the exploratory soil borings, laboratory results and chain of custody records. 2.0 Project Description 2.1 Site History Soil contamination was documented during removal of an underground fuel tank and nearby dispenser by McNabb Construction Company. Soil samples taken two feet and six feet below the dispenser recorded 250 and 7,800 parts per million (ppm) Total Petroleum Hydrocarbons (TPH) respectively. Soil samples taken at two feet and six feet below the center of the tank excavation indicated no detectable concentrations of contaminants. The cause and quantity of release of product was unknown. The Kern County Environmental Health Services Department (KCEHSD) requested that a site characterization be conducted to further study the unauthorized release of product at this site. PACIFIC GEOTECHNICAL ASSOCIATES, INC. South. High Sc oo te Characterization 3.1 Introduction The purpose and scope of this study was to define the vertical and lateral extent of the .product plume associated with the leaking dispenser located at the site, and to ascertain if any product had reached the water table. The sampling program described below was followed to achieve this end. 3.2 Soil Sampling Procedures On February 13th, 1991, two exploratory soil borings, soil borings SB#1 and SB#2, were advanced at the locations shown in Figure 2. Personnel of PGA performed the soil boring operations using an AMS hand auger with an auger head capable of retrieving a two-inch by six-inch soil sample in a brass sleeve. Soil 'samples were collected and described for laboratory analysis. On July 23rd, 1991, three exploratory soil borings were advanced at the locations shown in Figure 2. Soil borings SB#1 and SB#2 were reentered and deepened. Soil boring #3, a slant hole, was advanced under the foundation of the adjacent maintenance building. Personnel of PGA supervised soil boring operations and collected and described samples for laboratory analysis. Drilling services were provided by Melton Drilling Company of Bakersfield, California. Soil boring locations were selected by PGA personnel based on previous findings, field findings and recommendations made by Flora Darling of the KCEHSD. The positions of the borings were later determined for mapping purposes using a measuring tape. The' soil borings were advanced using a Mobile Drill B-53 drill rig equipped with an eight-inch diameter, continuous flight, hollow stem auger. Samples were collected using a hammer driven, split spoon sampler lined with 2.5-inch by six-inch brass rings. Soil borings SB#1 and SB#2 were both continuously cored by hand to 20.5 feet on February 13th, 1991. Subsequently, soil boring SB#1, was continuously cored for stratigraphic control using the Mobile Drill starting at 20.5 feet, the total depth of the original, hand-augered hole. Soil boring SB#2 was PACIFIC'GEOTECHNICAL ASSOCIATES, INC. 2 South High, School Site Characterization alternately- augcrcd and cored.' for sampling at* five .foot intervals .with~the: first'., sample taken at 20.5 feet. Soil descriptions were made by a geologist under the supervision of a registered geologist, and consisted of soil type, grain size, color, texture, sorting, inclusions, odor, and other distinguishing features. A Foxborro Model 128/FID Organic Vapor Analyzer (OVA) detector was used to field screen sampleS' for volatile organic compounds (VOC's). This measurement was recorded in' parts per million (ppm) as methane, and was taken from a capped brass ring core sample which had been agitated and set in the sun to warm for several minutes. Samples selected for laboratory analysis had both ends inspected for lithology and were then immediately sealed with laboratory film, plastic covers and secured with duct tape. Each sample was labeled, placed in an ice chest and maintained at 4 degrees Celsius until delivered to BC Laboratories in Bakersfield. Chain of Custody procedures were followed (see Appendix D). All samples were analyzed for benzene, toluene, xylene and ethylbenzene (BTXE), and total hydrocarbon (TPH) as gasoline using EPA methods 8020 and 5030 with a flame ionization detector (FID). The results of the analysis are presented in Appendix B and are summarized in Figure 3. The split spoon sampler and the brass tubes were ~vashed with a non- phosphate detergent and rinsed with water between samples to insure quality control. Boring ceased when successive field screening measurements· fell below five ppm using the OVA. After the samples were obtained and the operations complete, the bore holes were filled with concrete. Spoils from the augered soil borings were placed in a 55-gallon drum, sealed and stored on site. '4.0 Findings 4.1 Soil Profile As seen in Figure 3 and Appendix A, the soil profile generally consists of a thick sequence of fine to coarse grained, moderately well to poorly' sorted sand PACIFIC GEOTECHNICAL ASSOCIATES, INC. 3 South~ High School Site Characterization fining, do~w~d to, s~dy..~d., clayey silt.,. Thc. slit:: ~d~:~clay4::la~cr~ap~x~:~.,~<, , imatcly 31 feet below ~e surface is present in all ~c bo6ngs~ g~?:,'~.~'ia~er?:of. intcrbcddcd clay and sand is present in boring SB~I from the su~ace "to approximately 6.5 feet, and a sandy clay layer is present in bodng SB~2 from the surface to approximately five feet. The highest OVA field sc~ning values recorded above the six-foot depth level in each of ~e ~e borings. The highest TPH values were recorded in the same inte~al wi~ the exception of a high TPH value (1,100 ppm) at the 20.5 foot depth level in boring SB~2. No refusal of the auger or sampler was encountered at the site. Visual observations indicated soil moisture levels typical of the vadose zone. There was no indication that the water table was penetrated. Soil boring SB#3 was slant drilled beneath the foundation of the garage beside the dispenser location. The hole was drilled at 21° from the vertical towards the northeast. A detailed description of the soils encountered in the borings is presented in Appendix A of this report. The OVA field screening and laboratory analysis of soil samples are presented in Appendix B and C and summarized in Figure 2. An evaluation of the significance of these findings is presented in Section 5.0. 5.0 Evaluation 5.1 Introduction This section evaluates the' findings of the investigation to better develop conclusions and recommendations regarding this site. The evaluation is based on the results of observations and laboratory data. The purpose and scope of the investigation is to determine the vertical and horizontal extent of gasoline contamination, to ascertain if any product reached the groundwater, and to present options for appropriate remedial action. 5.2 Dispenser Site The maximum level of TPH as gasoline observed in soil boring #1 is 11,000 ugm/gm at five feet. Levels of TPH as gasoline decrease below this depth dramatically with a slight increase at 19.5 feet in the middle of the sand. The PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4 South High School Site Characterization, levels, of TPH, as', gasoline, below.' 20 .. feet: are ... none detected, (ND). in.:.this.~silt~,~'~:and clay lithology at 42.5 feet. Detectable levels of benzene are not observed', below 20 feet in soil boring #1. Soil boring #2 and #3 characterize the lateral extent of of contamination associated with the dispenser. The.lack of detectable BTXE and TPH at the tank site (Figure 2) delimits the southern edge of the plume. Soil boring #2 recorded a maximum level of 7,200 ugm/gm TPH as gasoline at a depth of 4.~5 to five feet. "'" These levels decreased downwards to ND at 14.5 feet and then in, tease t~_!~L.I_0_Q0 ugm/gm TPH as g~a,s..p_line al.20 feet. Levels of contamination rapidly drop to not detected (ND) in the next five feet. This contamination plume profile is similar to that seen in SB #1 (decreasing then increasing) but with a higher level of contamination at the deeper level of increase. Soil boring #3 had no detectable levels of TPH gasoline and BTXE from ten feet (nine feet true vertical depth) to the total depth of 40.5 feet (38 feet true vertical depth, approximately 12 feet inside the area of the maintenance building). Based on the results of soil borings #1, #2, and #3 the contamination plume associated with the dispenser site appears to have levels of TPH as gasoline above 1,000 ugm/gm and benzene levels above 1 ugm/gm restricted to depths above ten feet except for the sample recovered at the 20 foot level in SB#2. Detectable levels of TPH as gasoline and BTXE extend to a maximum depth of approximately 26 feet under borings SB#1 and SB#2, and have a radius of approximately 11 to 18 feet around soil boring #1 at depths above ten feet. Levels of TPH as gasoline greater than 500 ugm/gm extend vertically from eight feet to 25 feet and have a maximum lateral extent of approximately eight to 14 feet around soil boring #1. The approximate volume of soil with TPH as gasoline greater than 500 ugm/gm is estimated at 223 cubic yards. 5.3 Groundwater The 1989 Water Supply Repo; published by the Kern County Water Agency indicates that the depth to groundwater in the Summer of 1989 was approximately 160 feet. Groundwater is not considered to be threatened by the contamination plume because :, is approximately 130 feet below, the deepest PACIFIC GEOTECHNICAL ASSOCIATES, INC. ' 5 South . EIi§h school~it¢. Characterization detectable levels..o£ contamination and ' ' expected due to removal of the sources of contamination.'*/ 6.0 Conclusions 6.1 Introduction The dispenser site at South High School has been characterized for the vertical and horizontal extent of product plumes associated with leakage. Three soil borings ranging in depth from 33.5 to 40.5 feet were advanced with all soil samples being analyzed for TPH as gasoline and BTXE. A plan view (Figure 2) and a cross sectional views (Figure 3) of the contamination plume are .included in this report. 6.2 Findings The maximum vertical extent of contamination is approximately 26 feet in the dispenser site. All measured levels of contaminants were at their maximum (5,000 to 11,000 ugm/gm for TPH as gasoline and 3.0 to 130 ugm/gm benzene) shallower than ten feet from the surface. The volume of soil with contamination levels greater than 500 ugm/gm TPH as gasoline at the tank site is estimated at 223 cubic yards and extends to a depth of 26 feet, 183 cubic yards of which is located above ten feet below grade. 6.3 Risks This site does not pose a threat to groundwater due to the contamination source having been removed. Significant expansion of the plume is not expected providing that no driving mechanism is introduced (such as excessive surface water percolation)i The base of the'plume is at least 130 feet above the water table. There may exist a potential for gasoline vapors to accumulate beneath the foundation of the Maintenance Building as a result of vapors rising from the plume associated with the dispenser site. High levels of benzene, in excess of 100 ugm/gm as shallow as five feet may pose a risk to air quality in the immediate area of the maintenance building. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 6 South High School~Sitc Characterization 7.0 Remedial Action Options 7.1 Introduction Four remedial options are presented for the dispenser site. into consideration the following: These options take The sites do not pose an immediate threat to groundwater. Potential migration routes of the contaminants include downward migration due to excessive percolation of surface waters and upward migration of volatile vapors. Vapors from the sites could pose potential concerns. Supervision, testing and quality control for any of the mitigation alternatives has been included in these cost analyses. These estimates have been developed only for providing a general comparison between the four alternatives and should not be used for preliminary budgeting purposes. 7.2 Option 1/ No Action (Natural Biodegradation) No remedial action will be taken. The dispenser site will be resurfaced to meet the needs of the maintenance garage and the soil boring spoils will be removed to a proper disposal facility. Concentrations of contaminants will decrease with time due to; 1) the removal of the sources of product and 2) natural biodegradation processes which are already active. The time required for TPH gasoline and BTXE concentrations to be reduced significantly or to non-detectable levels in the soil cannot be known. Containment by surficial concrete and asphalt may isolate contaminant vapors from human activity. A notice will be posted inside and outside the Maintenance Building informing the public that gasoline contaminated soil is present beneath the driveway and garage and where information concerning the contamination can be found. This. option is feasible and will cost $500 or less to implement. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 7 South High .Schoo te Characterization 7.3 Option 2/ Soil Venting with Carbon Adsorbe~ Three vent wells and possibly as many as thre~ or mo~ air supply-WCll~, will be installed near the south corner of the Maintenance Building. vent wells will be drilled on a slant under the Maintenance Building foundation. The wells will use a PVC completion with perforations from total depth to 1.5 feet below the surhce. A surface hcility consisting of PVC piping, a regenerative blower and two 2000 lb. vessels containing activated carbon will be installed along the southeast wall of the Maintenance Building. The gasoline contaminated vapor will be drawn through the vessels where the contamination will be scrubbed from the air stream by adsorption onto granulated, activated carbon. The system will operate at a relatively low rate, between 10 and 75 cubic feet of air per minute, continuously or intermittently. At least 50% to 60% of the contamination will be remediated in this fashion, while natural processes such as dispersion and biodegradation will reduce the remaining contamination in the soil to below a6tion levels. The process will be monitored by regular sample taking and lab analysis. A thorough risk assessment will be conducted to identify and analyze all sources and receptors of contaminant vapors. The ventilation at the dispenser site will greatly reduce the hazard of vapors that may accumulate beneath the foundation. Concentrations of contaminants will decrease with time due to; 1) the removal of the sources of product and 2) natural biodegradation processes which are already active and 3) ventilation and scrubbing of vapors drawn from the plume. The time required for TPH gasoline and BTXE concentrations to be reduced significantly or to non- detectable levels in the soil cannot be known precisely, but it is estimated that one year of operation is required. A notice will bc posted inside and outside the Maintenance Building informing the public that gasoline contaminated soil is present beneath the driveway and foundation and where information concerning the contamination can be found. This option is feasible and will cost approximately $28,000 to implement. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 8 South High School~ite Characterization Option 3/ Vapor Extraction and On Site Incineration A vapor extraction system (VES) will be installed to remove and incinerate soil gases. ~Fourteen soil vapor extraction wells will be installed near the south corner of the Maintenance Building. Soil gas will be drawn from the soil when a vacuum is applied by a motor designed to incinerate thc extracted gas. All fourteen wells will be connected to a manifold that will allow for selective venting or extraction so as to optimize the extraction process. By continuing the process, volatile contaminants will be removed from thc soil. Contaminant-saturated vapors are drawn into a liquid dropout drum, 'through a ten-micron filter and into the carburetor of a water cooled, six-cylinder internal combustion engine. The engine burns the hydrocarbons, and the exhaust is passed through a three-way catalytic converter which oxidizes hydrocarbons and carbon monoxide. The exhaust nitrogen oxides also undergo a reduction reaction in the converter. A muffler will be installed on the engine exhaust. The VES engine will be situated · in a sound-proofing enclosure, and all wells and control equipment will be located within a locked, eight-foot storm fence. Due to the proximity of residences, it is recommended that the VES be active ten hours per day, during the daylight hours. The benefit is twofold. First, the 'impact on ambient 'sound levels will be less noticeable during the day, and second, down time will afford equilibration within the reservoir and may improve overall efficiency. Concentrations of contaminants will decrease. with time due to the removal of product and replacement by ambient air and subsequent dilution. The time required for TPH gasoline and BTXE concentrations to be reduced significantly or to below action levels in the soil can be estimated at a minimum of 45 days. Upon soil testing that demonstrates TPH and BTXE concentrations below action levels as determined by a representative of the KCEHSD the. VES will be removed, wells abandoned, concrete patched, and asphalt restored to specifications acceptable, to the KHSD. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 9 South, High Schoo te Characterization . . A notice,,, . will', be, posted inside the Maintenance, Buildin least two places informing the public that gasoline contammated~:~:i sOll~' present beneath driveway and garage foundation and where information concerning the contamination can be found: This option is feasible and will cost at least $20,000 to implement. 7.5 Option 4/ Excavation, Disposal and Backfill with Clean Soil Excavation and backfill with clean soil will be used to reduce the concentration levels of TPH as gasoline and BTXE in the soil.' Shoring of the Maintenance Building using piles and lagging or by using a process that trenches and pours a retaining wall in one pass prior to excavation will be necessary to ensure the structural integrity of the foundation. It should be noted that proximity to the Maintenance Building is critical to ensuring optimum elimination of the contaminated soil. The contaminated soil will be transported to a Class I disposal site, and the excavated area will be backfilled with clean soil. Roughly 80 per cent of the contamination will be removed by excavation to a depth~ of ten feet, and within one foot of the Maintenance Building. The soil under the Maintenance Building will be remediated using the technique described in Option 2, above. Excavation will continue until OVA readings fall to 0 ppm above background. The soil under the Maintenance Building will be vented until soil samples fall below action levels for TPH as gasoline and BTXE as determined by the KCEHSD. This option is feasible and will significantly reduce contamination levels in the soil. The cost for implementing this option is estimated to cost at least $40,000. ~ 7.6 Recommendations Two remediation options are recommended for this site: Option 2 is recommended as the most unobtrusive action alternative which will also address potential Safety hazards associated with the dispenser site. Biodegradation is a natural process which is presently active and will continue. The threat to the water table by the existing plume is minimal. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 10 South High School Site Characterization. Option, 2/.has~:thc. potential ,.to perform at a greater...than~/cxpcctcd~,'-efficicncy~.du¢~: to the concurrent natural processes and the increased contact time. between contaminant vapors and carbon because of the low flow rates planned. Option 3 is recommended as the most timely remedial action alternative. It involves less engineering risk than Option 4 but could take longer than expected, and carries with it the greatest noise risk to the surrounding environment. It should be noted that while Option 2 is relatively quiet it may be viewed as incomplete considering the extent to which natural processes present at the site are expected to contribute to the' reduction in contaminant concentrations. Option 3 risk is that project length could be extended due to diminishing efficiencies as soil contamination concentrations decline toward the end of the project. 8.0 Statement of Qualifications This document has been prepared by Steven H. Lewis, Project Geologist. Mr. Lewis began practicing geology in 1976 in California, and has broad experience in petroleum and environmental geology. The preparation *of this document has been supervised by Randall T. Metz, a Registered Geologist of the State' of California (#3995). Mr. Metz has participated in a number of site assessments including assessments of properties involving oil field activities. He has been practicing geology in California since 1976 and has published several articles on San Joaquin Valley geology. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 11 South High School Site Characterization .<~,:~l~t~,:9)l~.~,~. This report is intended for the exclusive use of Kern High School DistriCt. Pacific Geotechnical Associates, Inc. assumes no responsibility nor liability for the reliance herein or use hereof by anyone other than the above named client. In addition, all of the laborato~ work cited in ~is report was prepared under the supervision of the certified personnel of SMC Laborato~ and BC Laboratories, Bakersfield, which are solely responsible for the contents and conclusions of the respective laboratories. Respectfully submitted, Steven H. Lewis Project Geologist ~an~'a~l-T. Metz Calif. Reg. Geologist #3995 PACIFIC GEOTECHNICAL ASSOCIATES, INC. 12 MiNG WHITE _/ IF=eSt. Belle CASA ~"[ LOMI BAKERSMELD ~ ~ PLANZ WHITE LANE EAST PANAMA SOUTH HIGH SCHOOL ? Figure 1 LOCATION MAP · Oaf: .~Ot 11, l~gO 112 mile . ;: Revt~d: lffi PGA PARKING A f2'- 250 ppm 6' - 7800 ppm MAINTENANCE SHOP SB#1 Old Dispenser Location .i.!,t.i.l,t-i.i.!, ,i.!.I WOODSHOP i,i.!.!.i.l-i,!,i (backfilled) SB #1 Legend Soil Boring Contamination Plume (TPH Gasoline) ND 500 mg/kg > 1000 mg/kg i : Tank Location Sample Location ; From Prelim. Site Assessment: 2'- 1,700 ppmf 6'- ND i Depth below tank - ................ ppm TPH ND = Not Detected ~'"'"~~Pa~t~ Geotechnical Associates, Inc. SOUTH-HIGH SCHOOL Dmc 8/91 PLOT PLAN 10 FEET I Figure 21 -N- PARKING (Asphalt covered) GRASS AREA ~.: .SOIL BORING~' ' ' ~Pieaee':note bencle in ~ Maintenance Building _~: , #1 cross-se~ion. ,IL BORING ~ SOIL BORING .. NW SE SW NW .. Scale (Feet) LegendContamination Plume ~"~ Concrete [~ Sand ~ Clay (TPH Gasoline) ~ Sand & Silt ~ Sand, Silt & Clay ND 500 >1000 ugm/gm ugm/gm Laboratory analyses Field analyses ~~P~c Geotechnical Associates, Inc. TPH-G (~ SOUTH HIGH SCHOOL B/T/X/E OVA field screening of headspace gases TPH-G....Total Petroleum recorded in parts per million as methane. Hydrocarbon as Ga,o,ne,nu g CROSS SECTION A- A' B ............ Benzene in ug/g T ............ Toluene in ug/g X ............ Xylene in ug/g E ............ Ethylbenzene in ug/g Author: SHL I prol,ct: asoo2 I Figure 3 Drafted B~: SHLI ~Date: 8/91 South High School~ Site Characterization APPENDIX A Logs of Soil Borings PACIFIC GEOTECHNICAL ASSOCIATES, lNG. Property Owner: .KERN HIGH SCHOOL DISTRICT Site Address: SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID Boring # SB~I Location: CENTER OF DISPEN. PGA Personnel: R. METZr M. MCGRATHr MWF Dfllling Contrator: MELTON DRILLING COMPANY Driller: MICHEAL BRAYSON PGA Job #: SIS003 Date: 2/13r7/23/91 Drilling Method: HOLLOWSTEM AUGER/HAND AUGER Rig Type: MOBIL B-53 Total Depth: 33.5 Elev.: GROUND LEVEL Sample Equip: 18' SPLIT SPOON/2' BRASS SLEEVES Hole Diameter: 8' Time - Start: 11:20 End: 14:00 CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM 0.5 1.0 SP SAND TAN CRS POOR NONE STRONG ASPHALT CONGLOMERATE 1.0 1.5 ~ SM SAND TAN CRS POOR NONE STRONG 1.5 2.0 I~ SC CLAY SANDY DK/BRN MSV POOR BROWN STRONG SLIGHTLY PLASTICf POSSIBLE FILL 2.0 2.5 ~ SC CLAY SAND'~ GRY/BRI~ MSV POOR BROWN STRONG~ 2.5 3.0 IIIIIII ML CLAY SANDY GRY/BRI~ MSV POOR BROWN STRONG 3.0 3.5~ SM SAND SILTY GRY/BRI~ MSV POOR BROWN STRONG 3.5 4.0 ~.W SM SAND SILTY GRY/BRI~ MSV POOR BROWN STRONG 4.0 4.5 IIIIIII ML CLAY SILTY GRY/BRI~ MSV POOR BROWN STRONG SMGHTLYPLASTIC 4.5 5.0~~~ CL CLAY SILTY GRY/BRI~ MSV POOR BROWN STRONG GRAVEL 2' IN DIA. WET >50% 1 100% 5.0 5.5 ML CLAY SILTY GRY/BRI~ MSV POOR BROWN STRONG 802 11:50 1 3 1/2' LONG PIECE OF WOOD 5.5 6.0 ML CLAY SILTY GRY/BRI~ MSV POOR BROWN STRONG WET >50% GRAVEL 1' IN DIA. 6.0 6.5 ML CLAY SAND GRY/BRI~ FiNE POOR BROWN MOD MICACEOUS 6.5 7.0 )4 SM SAND TAN FN/MD MDANL NONE MOD 7.0 7.5~.~J'~"~';t'""'~ SM SAND TAN FN/MD WELL NONE SEGHT 7.5 8.0 ~ SM SAND TAN FN/MD WELL NONE SLIGHT 8.0 8.5~ SM SAND TAN FN/MD WELL NONE SLIGHT 8.5 9.0 SM SAND TAN FN/MD WELL NONE SEGHT 9.0 9.5 ~ SM SAND GRY/BRh MED MED NONE SLIGHT 9.5 10.0~ SM SAND GRY/BRN MED MED NONE SLIGHT 2 100% 10.0 10.5 ~ SM SAND GRY/BRN MED MED NONE SUGHT 571 12:25 2 10.5 11.0 I~ SM SAND GRY/BRN MED MED NONE SMGHT 11.0 11.5 ~ SM SAND GRY/BRN MED POOR NONE SEGHT 11.5 12.0 ~ SM SAND TAN FINE WELL NONE SLIGHT 12.0 12.5 m sc SAND CLAY TAN MSV MOD NONE SEGHT 12.5 13.0 ~ SM SAND CLAY TAN FINE MOD NONE SUGHT 13.5 14.0! ! SP SAN_ D TAN MED POOR NONE SUGHT 14.0 14.5 SP SN~iD TAN MD/CRS POOR NONE SMGHT 3 5% 14.5 15.0 SP SAND GRY/BRI~ MD/CRS POOR NONE SUGHT 119 1300 3 PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 1 of 3 · Property Owner: KERN HIGH SCHOOL DISTRICT Site Address: SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID Boring # SB~I Location: CENTER OF DISPEN. PGA Personnel: R. METZ~ M. MCGRATHf MWF Drilling Co~trator: MELTON DRILLING COMPANY Driller: MICHEAL BRAYSON PGA Job #: SIS003 Date: 2/13r7123/91 Drilling Method: HOLLOWSTEM AUGER/HAND AUGER Rig Type: .M. OBIL B-53 Total Depth: 33.5 Elev.: GROUND LEVEL Sample Equip: 18' SPLIT SPOON/2' BRASS SLEEVES Hole Diameter: 8' Time - Start: 11:20 End: 14:00 CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM 15.0 15.5 SP SAND GRY/BRN MED POOR NONE SLIGHT 15.5 16.0 SP SAND RED/BRN MED MOD NONE sLIGHT 31 16.0 16.5 SP SAND RED/BRN MED MOD NONE SLIGHT 44 16.5 17.0 SP SAND TAN MED MOD NONE SLIGHT 96 17.0 17.5 SP SAND TAN MED MOD NONE SLIGHT 17.5 18.0 SP SAND RED/TAN MED MOD NONE SLIGHT 275 18.0 18.5 SP SAND RED/TAN MED MOD NONE SLIGHT 106 18.5 19.0 SP SAND TAN MED MOD NONE SLIGHT 231 19.0 19.5 SP SAND TAN MED MOD NONE SMGHT 187 70% 19.5 20.0 SP SAND TAN MED MOD NONE SLIGHT 150 13:55 4 90% 20.0 20.5 10 SP SAND TAN MED MOD NONE SEGHT 0.4 SAND FINE TO COARSE! MEDIUM 90%° 20.5 21.0 14 ~ SW SAND YLW/BRI~ 'MED MOD/PR NONE NONE 90% 21.0 21.5 17 ~] SW SAND YLW/BRI~ MED MOD/PR NONE NONE 80% 21.5 22.0 17 ~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 80% .22.0 22.5 18 ~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 1 80% 22.5 23.0 27 ~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 80% 23.0 23.5 13 ~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 80% 23.5 24.0 24 ~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 80% 24.0 24.5 36 ~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 0.2 90% 24.5 25.0 21~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 90% 25.0 25.5 34 ~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 9:44 A 90% 25.5 26.0 38 ~ SW SAND YLW/BRI~ MED MOD/PR NONE NONE 0.7 90%, 26.0 26.5 25 ~ SW SAND YLWIGR~ MED MOD/PR NONE NONE 90% 25.5 27.0 34 ~ SW SAND YLW/GR'~ MED MOD/PR NONE NONE ND 90% 27.0 27.5 35 ~ SW SAND YLW/GR~ END MOD/PR NONE NONE ~ 27.5 28.0 28 ~..SW SAND YLW/GR~ MED MOD/PR NONE NONE 90% 28.0 28.5 33 ~ SAN.___.~D ~ YLWIGR~ GEV[. MOD/PR, NONE NONE 1 FEW MEDIUM GRAVEL 90% 28.5 29.0 SAND Yi.W/BR~ FN/MED MOD/PR NONE NONE 75% 29.0 29.5 20 ~,_~._! SAND ~ YI.W/BRi~ VF/MED MOD/PR NONE WEAK FINER GRAIN, SL CLAY TO V. SlLTY 75% 29.5 30.0 24 ~ SW SAND Yt.W/BRI~ VF/MED MOD/PR NONE WEAK ND ODOR AT 20.5 PO~S. FILL 'PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 2 of 3 Property Owner: KERN HIGH SCHOOL DISTRICT Site Address:. SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID Boring # SB~I Localion: CENTER OF DISPEN. PGA Personnel: R. METZ~ M. MCGRATH~ MWF Drilling Conb'ator: MELTON DRILLING COMPANY Driller: MICHEAL BRAYSON PGA Job #: SIS003 Date: 2/13~7/23/91 " Drilling Method: HOLLOWSTEM AUGER/HAND AUGER Rig Type: MOBIL B-53 Total Depth: 33.5 Elev.: GROUND LEVEL Sample Equip: 18' SPLIT SPOON/2' BRASS SLEEVES Hole Diameter: 8' Time - Start: 11:20 End: 14:00 CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM 7 75% 30.0 30.5 28 ~ SW SAND YLW/BRN VF/MED MOD/PR NONE WEAK 10:03 B OTHER DEPTHS NO ODOR 8 75% 30.5 31.0 30 .=.."--.'--.'--.'---; SW SAND YLW/BRN VF/MED MOD/PR NONE WEAK 890°/0 31.0 31.5 75 ,,,,, ML SILT CLAY YLW/BRN MSV POOR NONE WEAK ND SANDYSILTTOSILTCLAYEY, FINE 8 100% 31.5 32.0 55IIIII ML SILT CLAY YLW/BRN MSV MD/PR NONE WEAK 9 50% 32.0 32.5 38 ML SILT CLAY YLW/BRN MSV MD/PR NONE WEAK 9 100°/o 32.5 33.0 22 ML SILT CLAY YLW/BRN MSV MD/PR NONE WEAK ND 9 100% 33.0 33.5 18 ML SILT CLAY YLW/BRN MSV MD/PR NONE WEAK 10:27 C VERY FINE GRAINED SAND 33.5 34.0 COMPLETED BORING DUE TO ND 34.0 34.5 OVA READINGS AND APPARENT 34.5 35.0 I CLEAN SAMPLES PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 3 of 3 Property Owner: KERN HIGH SCHOOL DISTRICT Site Address: SOUTH HIGH SCHOOL 1101 PLANZ ROAD OVA: FOXBORO 128FID D~lling Conlrator: MELTON DRILLING COMPANY Ddller: MICHEAL BRAYSON Bodng # SB#2 Location: 145°NWr? OF SB 1 PGA Personnel: R. METZ~ M. MCGRATHr RWF PGA Job #: SIS003 Date: 2/13t7/22/91 Ddlling Melhod: 2" HAND AUGER/HOLLOWSTEM AUGER Sample F_.~uil~: 18' SPLIT SPOON/2' BRASS S! FFVES Rig Type: MOBIL B-53 Total Depth: 36 Elev.: GROUND LEVEL Hole Diameter: 8'/2' '13me- Start: 14:00 End: 16:00 CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM 0.0 0.5 [/~ ~ ~1 CL CLAY SANDY DK/GRY: MSV NONE STRONG TOP 2' ASPHALT 0.5 1.0~~~''~d CL CLAY SANDY DKJGRY ! MSV NONE STRONG AUGERED TO 20' USING HAND AUGER 1.0 1.5 ~il ~ CL CLAY SILTY DK/GRY MSV NONE STRONG · 1.5 2.0 ~_~,~ CL CLAY SANDY DK/GRY~ MSV NONE STRONG 2.0 2.5~ CL CLAY SANDY DK/GRY MSV NONE STRONG 836 2.5 3.0 CL CLAY SILTY DK/GRY MSV NONE STRONG 3.0 3.5 CL CLAY SILTY DK/GRY MSV NONE STRONG 3.5 4.0 CL CLAY SILTY DK/GRY MSV NONE STRONG 4.0 4.5 CL CLAY SILTY DI~GRY MSV NONE STRONG 1 100% 4.5 5.0 CL CLAY SILTY DK/GRY MSV NONE STRONG 439 14:30 1 PLASTIC, WET 5.0 5.5 ~ SM SAND SILTY TAN FINE MOD NONE STRONG 5.5 6.0 ~ SM SAND SILTY TAN FINE MOD NONE STRONG 6.0 6.5 ~ SM SAND SILTY TAN FINE MOD NONE STRONG 6.5 7.0~ SM SAND SILTY TAN FINE . WELL NONE STRONG 7.0 7.5 SM SAND SILTY TAN FINE WELL NONE S'I-RONG 7.5 8.0 SM SAND SILTY TAN FINE WELL NONE STRONG 8.0 8.5 ~ SM SAND SILTY TAN FINE WELL NONE STRONG 8.5 9.0 ~ SM SAND SILTY GRY/BRN FINE WELL NONE MOD 9.0 9.5 ~ SM SAND SILTY TAN FINE POOR NONE MOD ~,. 2 60% 9.5 10.0 ,,,,--- ~ SM SAND SILTY TAN MED POOR NONE MOD 175 15:00 2 10.0' 10.5 ~ SM SAND SILTY TAN MED POOR NONE MOD ~,~.. 10.5 11.0 ~ SM SAND SILTY TAN MED POOR NONE MOD ~~ 11.0 11.5~SM SAND SILTY TAN MED POOR NONE MOD 11.5 12.0 SC "~"~; CLAY BRN MED POOR NONE SUGHT 12.0 12.5 ~ANU SILTY BRN MED POOR NONE SUGHT 12.5 13.0 ~ SM SAND SILTY BRN M,ED POOR NONE SUGHT 13.0 13.5 ~ SM SAND SILTY BRN MED POOR NONE SUGHT ,~-~?~ 13.5 14.0 ~ SM = S/~ID , SILTY TAN ~ POOR NONE SUGHT ' 14.0 14.5 ~ SM : ,S~II~iD SILTY TAN M.E.D POOR NONE SUGHT ', 3 100% 14.5 15.0 ~ SM SAND SILTY TAN MED POOR NONE SUGHT 87 15:35 3 PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 1 of 3 Property Owner: Site Address: SOUTH HIGH SCHOOL 1101 PLANZ ROAD KERN HIGH SCHOOL DISTRICT Drilling Conlrator: MELTON DRILLING COMPANY Drilling Melflod: 2" HAND AUGER/HOLLOWSTEM AUGER Sample Equip: 18" SPUT SPOON/2" BRASS SLEEVES OVA: FOXBORO 128FID Bodng # SB~2 LocalJon: 145°NW~7' OF SB 1 PGA Personnel: R. ME'[Z~ M. MCGRATHr RWF Driller: MICHEAL BRAYSON PGA Job #: SIS003 Date: 2/13r7/22/91 Rig Type: MOBIL B-53 Total Depth: 36 Elev.: GROUND LEVEL Hole Diameter: 8"/2' Time - Start: 14:00 End: 16:00 CORE REC. DEPTH BLOW LOG # % TOP BOT CNT USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # PPM AUGERED AHEAD AUGERED TO 25' WITH MOBIL B-53~ FIRS'I' SAMPLE TAKEN AT 25' AUGERED AHEAD PACIFIC GEOTECHNICAL ASSOCIATES, iNC. PAGE 2 of 3 Pmperbj Owner: KERN HIGH SCHOOL DISTRICT Site Address: SOUTH HIGHSCHOOL 1101 PLANZROAD OVA: FOXBORO 128FID Bodng # SB~2 Location:. i45°NWf7' OF SB 1 PGA Personnel: R. ME1-Zr M. MCGRATHr RWF Drilling Conlrator: MELTON DRILLING COMPANY Driller: MICHEAL BRAYSON PGA Job #: SIS003 Date: 2/13r7/22/91 Dn'lling Method: 2' HAND AUGER/HOLLOWSTEM AUGER Sample Equip: 18" SPLIT SPOON/2' BRASS SLEEVES Rig Type: MOBIL B-53 Total Depth: 36 Elev.: GROUND LEVEL Hole Diameter: 8'/2' 'l~me - Start: 14.1)0 End: 16:00 CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM 7(P/,~ 30.0 30.5 13 ~SM SAND SILTY GRY/BRN VF/MD POOR NONE NONE 70% 30.5 31.0 17 ~I~M SAND SILTY GRY/BRN VF/MD MOD PR NONE NONE 13:35 B VERY SILTY SAND FINING DOWNWARD 70% 1 31.0 31.5 15 BBI~IISC SAND CLAY YLW/BRN VF/MD MOD PR NONE NONE ND SILTY CLAY LAM. 2-4' AT BOTTOM 31.5 32.0 I 32.0 32.5 I 32.5 33.0 AUGERED AHEAD 33.0 33.5 33.5 34.0 34.0 34.5 34.5 35.0 35.035.5 7 IIIII ML SILT SAND~ BROWN MSV VPOOR NONE NONE SANDY, VERY FINE- MEDIUM GRAINED · ,.5 ~.0 ,,!1111 ML SILT CLAY BROWN MSV POOR NONE NONE 13:45 C VERY CLAYEY. COMPLE'I'ED HOLEWITM 36.0 36.5 16 ML SILT CLAY BROWN MSV POOR NONE NONE ND THREE CONSECUTIVE ND/LOW f OVA 36.5 37.0 READINGS PACIFIC GEOTECHNICAL ASSOCIATES. INC. PAGE 3 o! 3 Propert7 Owner:: KERN HIGH SCHOOL DISTRICT Boring # SB~3 Location: SEE PLAT. Site Address: SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID PGA Personnel: S. LEWlSr T. NUNNINK Drilling Contrator:. MELTON DRILLING COMPANY Ddller: MICHEAL BRAYSON PGA Job #: SIS003 Date: 7/23/91 Drilling Melhod: HOLLOWSTEM AUGER Rig Type: MOBIL B-53 Total Depth: 40.5 Elev.: GROUND LEVEL Sample Equip: 18' SPLIT SPOON Hole Diameter: 8' '13me - Start: 10:55 End: 12:45 CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM 0.0 0.5 0.5 1.0 1.0 1.5 1.5 2.0 2.0 2.5 2.5 3.0 3.0 3.5 3.5 4.0 1 70% 4.0 4.5 17 1 70% 4.5 5.O 12 1 70% 5.0 5.5 ? 5.5 6.0 6.0 6.5 6.5 7.0 7.0 7.5 7.5 8.0 8.0 8.5 8.5 9.0 2 80% 9.0 9.5 8 2 80% 9.5 10.0 10 2 80% 10.0 10.5 12 10.5 11.0 11.0 11.5 11.5 12.0 12.0 12.5 12.5 13.0 13.01 13.5 13.5 14.0 3 ~ 14.0 14.5 12 3 9O°/, 14.5 15'o 2O sP SAND GREY MED MOD NONE NONE AUGERED AHEAD SP SAND GREY MED MOD NONE NONE SP SAND GREY MED MOD NONE NONE SP SAND GREY MED MOD NONE STRONG ESTIMATED-BORINGS (~SURFACE SP SAND GREY MED MOD NONE STRONG STRONGODOR SP SAND GREY MED MOD NONE STRONG SP SAND GREY MED MOD NONE STRONG SP SAND GRY/BRN FN/MD MD/PR NONE STRONG SM SAND GRY/BRN FN/MD MD/PR NONE STRONG OCCASIONALY SILTY SP SAND GRY/BRN FN/MD MD/PR NONE STRONG >1000 SP SAND GRY/BRN FN/MD MD/PR NONE STRONG 11:09 A AUGERED AHEAD THROUGH SAND SP SAND GRY/BRN VFIMD POOR NONE STRONG ML SILT CLAY GRY/BRN MSV POOR NONE STRONG 45 VERY SILTY, CLAYEY ML SILT CLAY GRY/BRN MSV POOR NONE STRONG 11:23 B AUGERED THROUGH SAND~ FINE TO MEDIUM GRAINED SL SAND GRY/BRI~ MED MD/PR NONE FAINT IOCCASIONAL CLAY SP SAND YLW/BRI~ MED MD/PR NONE FAINT 14 PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE I of 3 Property Owner: KERN HIGH SCHOOL DISTRICT Site Address: SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID Bodng # SB4J3 Localion: SEE PLAT. PGA Personnel: S. LEWlS~ T. NUNNINK Dn'lling Conlrator: MELTON DRILLING COMPANY Driller: MICHEAL BRAYSON PGA Job #: SIS003 Date: 7/23/91 Drilling Method: Sample Equip: HOLLOWSTEM AUGER 18' SPLIT SPOON Rig Type: MOBIL B-53 Total Depth: 40.5 Elev.: GROUND LEVEL Hole Diameter: 8" Time - Start: 10:55 End: 12:45 :~.~*:*:~':'~Fi:'"i~i:: : ::::::::::::::::::::::::::::::::::: CORE REC. DEPTH BLOW LOG # % TOP BOT CNT 3 90% 15,0 15.5 20 15.5 16.0 16.0 16.5 16.5 17.0 17.0 17.5 17.5 18.0 18.0 18.5 18.5 19.0 4 70% 19.0 19.5 21 4 70% 19.5 20.0 29 4 70% 20.0 20.5 37 20.5 21.0 21.0 21.5 21.5 22.0 22.0 22.5 22.5 23.0 23.0 23.5 23.5 24.0 5 9(P/o 24.0 24.5 20 5' 90% 24.5 25.0 30 5 gO% 25.0 25.5 3O 25.5 26.0 25.0 26.5 25.5 27.0 27.0 27.5 27.51 28.0 28.0! 28.5 23.5~ 29.0 6 70"/0 29.029.5 23 6 70% 29.5 30.0 50 USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # PPM FAINT AUGERED AHEAD SILTY AUGERED AHEAD NONE NONE DCCASIONAL FINE TO VERY FINE ' PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 2 of 3 Property Owner: KERN HIGH SCHOOL DISTRICT Site Address: SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID Boring # SB~3 Location: SEE PLAT. PGA Personnel: S. LEWlS~ T. NUNNINK Drilling Conlrator: MELTON DRIU_ING COMPANY Driller: ' MICHEAL BRAYSON PGA Job #: SIS003 Date: 7/23/91 . Drilling Melhod: HOLLOWSTEM AUGER Rig Type: MOBIL B-53 Total Depth: 40.5 Elev.: GROUND LEVEL Sample Equip: 18' SPLIT SPOON Hole Diameter: 8' '13me - Start: 10:55 End: 12:45 ................................................................................ ~"'¥"~ ............ ~'" ~!i~i i~!~i~ii~i~iiii~i~:::' ................. : ..................... ii CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM :' 6 70% 30.0 30.5 43 30.5 31.0 31.0 31.5 31.5 32.0 32.0 32.5 32.5 33.0 33.0 33.5 33.5 34.0 7 90% 34.0 34.5 35 7 ~ 34.5 35.0 55 7 90% 35.0 35.5 NP 35.5 35.0 36.0 36.5 36.5 37.0~ 37.0 37.5 37.5 38.0 38.0 38.5 38.5 39.0 8 39.0 39.5 11 8 39.5 40.0! 16 8 4O.0 40.51 21 SP SAND YLW/BRN MED MOD NONE NONE 1.8 AUGERED AHEAD SM SAND SILT GRY/BRN FN/MD MD/PR NONE NONE 3 CLAY~ VERY SILTY ~ NEAR 35' SM SAND SILT GRY/BRN VF/FN MD/PR NONE NONE 12:14 G SM SAND SILT GRY/BRI~ VF/FN MD/PR NONE NONE AUGERED AHEAD ML SILT CLAY GRY/BRN V FINE POOR NONE NONE SANDY VERY FINE GRAINED SP SAND GRY/BRN V FINE POOR NONE NONE 12:26 H COMPLETED WELL BASED ON LOW SP SAND GRYIBRN V FINE POOR NONE NONE 0.8 OVA READINGS PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 3 of 3 South High School Site Characterization APPENDIX B Laboratory Results PACIFIC GEOTECHNICAL ASSOCIATES, INC. Client Name: Pacific Geotechnical Associates Address : 4664 American Avenue Bakersfield, CA 93309 Attention : Mr. Rod Williams Date samples received : 2-13-91 Date analysis completed: 2-20-91 Date of report : 2-20-91 Analytical .Chemistry Project Name: South High School Project % : SIS003 RESULTS OF ANALYSIS: 690 ID: SB~i-1 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-×ylene Isopropylbenzene TPH (Gasoline) ugm/gm MDL,ugm/gm 130. 0.005 140. 0.005 320. 0.005 630. 0.005 770. 0.005 100. 0.005 20. 0.005 11000. 1.0 Method of Analysis for BTX/TPH (Gasoline): 3810/8020 (FID) MDL = Minimum Detection Level TPH = Total Petroleum Hydrocarbons ugm/gm = micrograms per gram (ppm) ND = None Detected An~ e'l a Horton Analytical Chemist 3155 Pegasus Drive · Bakersfield, CA 93308 P.O. Box 80835 · Bakersfield, CA 93380 · ·(805) 393-3597 FAX (805) 393-3623 RESULTS OF ANALYSIS: 691 ID: SB~i-2 Benzene Toluene Ethylbenzene p-Xylene m'Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm .37 .97 .33 .51 .55 1.3 .50 48. MDL 0 0 0 0 0 0 0 , ugm/gm .005 .005 .005 .005 .005 .005 .005 1.0 692 ID: SB~I-3 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm .068 .18 .071 .066 .12 .20 .13 4.6 MDL, ugm/gm 0.005 0.005 0.005, 0.005 0.005 0.005 0.005 1.0 693 ID: SB~I-4 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm .090 .34 .13 .22 .26 .62 .24 12. MDL 0 0 0 0 0 0 0 ,ugm/gm .005 .005 .005 .005 .005 .005 .005 .0 An~eia H°~ton Analytical Chemist RESULTS OF ANALYSIS: 694 ID: SB~2-1 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm 100. 120. 80. 170. 340. 390. 83. 7200. MDL,ugm/gm 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 695 ID: SB~2-2 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm .77 1.0 ND 1.4 .66 ND ND 18. MDL, ugm/gm 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 696 ID: SB%2-3 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm ND ND .0054 .0066 .0069 .0079 .011 ND MDL,ugm/gm 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 A~e'la Horton Analytical Chemist RESULTS OF ANALYSIS: 697 ID: SB~2-4 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/g~' 18.~ 27. 27. 62. 56. 14. 4.3 1100. MDL, ugm~/gm 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 A~e'l a Horton Analytical Chemist ENVIRONMENTAL CHEHICAL ANALYSIS PETROLEU¥ LABO RATO RI FSi., I .... j.'J..EGUN~~REG~CHEM~-~ENGR.'*;~-;~%.~ .- ,:~,,.'... ..... ...~ '4100 ATLAS CT., BAKERSFIELD, CALIFORNIA 93308 PHONE'(805) 327aL911 FAX (805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. Date of 4200 EASTON DRIVE SUITE #2 Report= 08/02/91 BAKERSFIELD, CA 93309 Lab ~= 8387-1 Attn.: STEVE L. 324-7768 Sample Description= #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT= SBiA @ 25.0 - 25.5' (SOIL) 7/23/91 @ 0944 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Analysis Results None Detected None Detected None Detected None Detected None Detected None Detected None Detected Date Analysis' Completed: 08-01-91 Reporting Units mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor £#VIAONYENTAL CHE¥1CAL PETROLEU¥ ' I .... ' · '~'~::'~.-'~'~ ~ ~'" '~-"~'~'~'" <".' 4 00 ATCAS CT., ,AKERS eCD, CAU ORN ' Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab $: 8387-2 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT~ SBiB @ 30.0 - 30.5' (SOIL) 7/23/91 @ 1003 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 'Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ENVIRONMENTAL CHEHIC4L ANALYSIS PETROLEUM LABO RATO, RI ES, INC ,'. - · .: ._ d,'j,~EGCIN'~,REG':CHEM~..ENGR,~r;'.,.~?-~...~.?,.: ~. :....'. ,. , 4100 ATLAS CT., BAKERSFIELD, CALIFORNIA,93308 PHONE (805).,327~,9'11 FAX'(805) 327-1916 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab #: 8387-3 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SBlC@ 33.0 - 33.5' (SOIL) 7/23/91 @ 1027 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ENVIRONMENTAL CHEMICAL ANALYSIS PETROLEUM' Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. Date of 4200 EASTON DRIVE SUITE ~2 Report: 08/02/91 BAKERSFIELD, CA 93309 Lab $~ 8387-4 Attn.: STEVE L. 324-7768 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN. HIGH SCHOOL DISTRICT: SB2A @ 25.5 - 26.0' (SOIL) 7/23/91 @ 1327 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07123191 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ENVIRONMENTAL CHEMICAL ANALYSIS PETROLEUM LABO RATO, RIES' ._. · . .j...j:~.EGUN; REG~'~CHEM?ENGR~<~.~.. ~. ....... ~.? 4100 ATLAS CT., BAKERSFIELD, CALIFORNIA 93308 .PHONE (805) 327-4911 FAX. (805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE $2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab #: 8387-5 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB2B @ 30.5 - 31.0' (SOIL) 7/23/91 @ 1335 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor .T ENVIRONYENTAL CHE¥1CAL ANALYSIS PETROL£U¥' LABO RATO. RIF,$ 4100 ATLAS CT., BAKERSFIELD, CALIFORNiA Petroleum Hydrocarbons ~" i805)'327'-1918 PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.= STEVE L. 324-7768 Date of Report: 08/02/91 Lab ~: 8387-6 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB2C @ 35.5 - 36.0' (SOIL) 7/23/91 @ 1345 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Con st ituent s Date Sample Received @ Lab: 07/23/91 Date Analysis Completed= 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor LABO.RATORI ES, 4100 ATLAS CT., BAKERSFIELI~, CALIFORNIA 93308 PHONE',(805)32;'.4,911 FAX(805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/05/91 Lab ~: 8387-7 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3A @ 5.0 - 5.5' (SOIL) 7/23/91 @ 1109 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units Minimum Reporting Level Benzene 3.0 mg/kg 2. Toluene 50. mg/kg 2. Ethyl Benzene 46. mg/kg 2. o-Xylene 300. mg/kg 2. m-Xylene 340. mg/kg 2. p-Xylene 140. mg/kg 2. Total Petroleum Hydrocarbons (gas) 5000. mg/kg 600. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ENWRONHENTAL CHE¥1CAL ANALYSIS f~ETROLEU¥ ' I./NBO 4100 ATLAS CT., BAKERSFIELD, CALIFORNIA' 93308:,:PHONE; Petroleum Hydrocarbons !FAX~(805),327-1918 PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab #: 8387-8 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3B @ 10.0 - 10.5' (SOIL) 7/23/91 @ 1123 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ENVIRONMENTAL CHE¥1C4L ANAL YSI~ p.no uu.*. .. 4100 ATLAS CT., BAKERSFIELD, CALIFORNIA 93-___'~8_:PHONE (805)~32'/.-4911 FAX (805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab ~= 8387-9 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3C @ 15.0 - 15.5' (SOIL) 7/23/91 @ 1130 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor CHEMICAl. ANALYSIS PETROLEU¥" PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/05/91 Lab $: 8387-10 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3D @ 19.5 - 20.0' (SOIL) 7/23/91 @ 1139 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis · Completed: 08-02-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/05/91 Lab $: 8387-11 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3E @ 24.5 - 25.0' (SOIL) 7/23/91 @ 1147 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Regults Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene NOne Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ENVIRONYENTAL CHE¥1CAL ANALYSIS I~IROLEO¥" 4100 ATLAS CT., Petroleum Hydrocarbone ~327-1918 PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE $2 BAKERSFIELD, CA 93309 Attn.= STEVE L. 324-7768 Date of Report= 08/05/91 Lab ~= 8387-12 Sample Description= #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTEICT~ SB3F @ 29.5 - 30.0' (SOIL) 7/23/91 @ 1158 SAMPLE COLLECTED BY SHL/TRN TEST METHOD= TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix= Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/05/91 Lab $: 8387-13 Sample Description: $SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3G @ 34.5 - 35.0' (SOIL) 7/23/91 @ 1214 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 · p-Xylene None Detected mg/kg 0.005 Total Petroleum HYdrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor CHF.¥1CAL ANALYSIS, . 41'00 ATLAS CT, BAKERSFIELD, Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of. Report: 08/05/91 Lab $: 8387-14 Sample Description: ~SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3H @ 39.5 - 40.0' (SOIL) 7/23/91 @ 1226 SAMPLE COLLECTED BY S~L/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor Chain of Custody Documents PACIFIC GEOTECHNICAL ASSOCIATES, INC. ~- *CHAIN OF CUSTODY RECO Paciflc/~eotechnical Associates, Inc. 4664 American Avenue · Bakersfield, Calif. 93309 · (805) 832-7490 ~$7- I Pacific Geotechnical Inc. Associates, ! 4664 American Avenue · Bakersfield, Calif. 93,309 CHAIN OF CUSTODY RECOI 30.0  ""~- Pacific Geotechnical Associates, Inc. ! 4664 American Avenue * Bakersfield, Colif. 93309 CHAIN OF CUSTODY RECO · (805) 832-7490 Pacific' Geotechmcal' Asso?iates, Inc, t~ [ 4200 Easton Drive, Ste. 2 Bakersfield, Calif:. 93309 November 9, 1992 Ms. Flora Darling Environmental Health Serv. Dept. 2700 "M" Street Suite 300 Bakersfield, CA 93301 Dear Ms. Darling: Pacific Geotechnical Associates, Inc. (PGA), is now submitting a closure report for your approval, for the South High School Remediation site, Enclosed is the Closure Report. If you have any questions, please do not hesitate to contact me or Randy Metz at the above printed number. Thank you. Sincerely, Michael R. McGrath Encl. cc: Randall T. Metz Andrew Marlnello acific/Geatechnical Associates, Inc. 4200 Easton Drive. Ste. 2 · Bakersfield. Calif. 93309 · (805) 324-7768 SOUTH HIGH SCHOOL CLOSURE REPORT Submitted on behalf of KERN HIGH SCHOOL DISTRICT ¸by Pacific Geotechnical Associates, Inc. November 9, 1992 ~,~""~~~~~~ ~ical Associates, Inc. Closure Repon: SoueHigh School South High School Remediation Closure Report TABLE OF CONTENTS 1.0 2.0 3.0 4.0 5.0 6.0 7.0 INTRODUCTION .......................................................................................... ~ ...... 1 PROJECT DESCRIPTION ................................................................................... 1 2.1 SITE HISTORY ........................................................................................ 1 2.2 ESTIMATE OF VOLUME OF EXTRACTED HYDROCARBONS ............................................................................................. 2 DOCUMENTATION BORINGS ................................................... , ..................... 3 3.1 PURPOSE AND SCOPE .......................................................................... 3 3.2 DOCUMENTATION BORING LOCATION ......................................... 3 3.3 DOCUMENTATION BORING ............................................................... 3 CONCLUSIONS .................................................................................................... 4 4.1 INTRODUCTION ..................................................................................... 4 4.2 RISKS ......................................................................................................... 4 RECOMIVIENDATION ......................................................................................... 4 DESTRUCTION OF VAPOR RECOVERY WELLS ........................................ 4 CLOSING ............................................................................................................... 5 Illustration Figure i Documentation Boring Plot Plan Appendices Appendix A Laboratory Findings Appendix B Chain of Custody Records Pacific Geotechnical Associates, Inc. page ii 1.0 INTRODUCTION South High School is located 1101 Planz Road, Bakersfield, California. Soil contamination was discovered near' the maintenance building during removal of a leaking fuel dispenser and associated underground gasoline storage tank. A remedial action plan was designed, approved by the Kern County Environmental Health SerVices Department, KCEHSD, and initiated to reduce contaminants to below action levels The following report describes the actions taken to this date and recommends closure of the site. 2.0 PROJECT DESCRIPTION 2.1 SITE HISTORY Soil contamination was underground fuel tank Construction Company. Soil samples taken two feet and six feet documented during removal of an and nearby dispenser by McNabb below the dispenser recorded 250 and 7,800 parts per million (ppm) Total Petroleum Hydrocarbons (TPH) respectively. Soil samples taken at two feet and six feet below the center of the tank excavation indicated no detectable concentrations of contaminants. The cause and quantity of release of product was unknown. The Kern County Environmental Health Services Department (KCEHSD) requested that a site characterization be conducted to further study the unauthorized release of gasoline at this site. On July 23, 1991, a site characterization was performed by Pacific Geotechnical Associates, Inc., (PGA), and a report was submitted to the KCEHSD for approval. The maximum contamination concentration (11,000 ppm TPH, and 130 ppm Benzene) was encountered at five feet below grade at the dispenser site. All measured levels of contaminants were at their maximum (5,000 to 11,000 ugm/gm for TPH as gasoline and 3.0 to 130 ugm/gm benzene) at depths less than ten feet below the surface. Total Petroleum Hydrocarbons and Pacific Geotechnical AssociateS, Inc. page 1 Closure Report: Sou igh School ,") ~!~]~~4:~:".-"' Benzene concentrations were above the maximum allowab!e 'leV~l~:?as:i ' established by the L.U.F.T. Field Manual fOr areas of'loW~,~l~achmg::. potentiaI. Following its approval by the Kern County Environmental Health Services Department, KCEHSD, on June 16, 1992, a remedial action plan was implemented by Pacific Geotechnical Associates, Inc. The remediation program involved the soil venting and carbon absorption of volatile organic compounds. (VOC's). This process · involved the installation of soil vapor recovery wells which were perforated in the contaminated zone. Soil gases were withdrawn from the soil when a vacuum was applied .to the wells. Volatilization of liquids to the vapor phase occurred as the contaminated soil reestablished vapor phase equilibrium. The vapors moved from the extraction wells via piping through two vessels containing approximately 2,000 pounds of granular activated carbon. The residual air, stripped of contaminate vapors by the activated carbon, were vented into the atmosphere. By continuing the vapor' extraction process, volatile contaminants are removed from the soil. 2.2 ESTIMATE OF VOLUME OF EXTRACTED HYDROCARBONS From June 16, to November 6, 1992, the soil venting through carbon absorption process has been operating. The performance of the operation has been closely monitored and analyzed to determine the effectiveness of the remediation system. To date it is estimated that approximately 80% of the volume of gasoline in the ground has been extracted from the contamination plume. This figure has been derived by cross-plotting Time (vacuum days) vs Percent of remaining fuel (in pounds). From this it was judged prudent at this time to' advance a documentation boring. The laboratory results from the documentation boring indicated that contaminants were either eliminated or reduced to below action levels (Appendix A). Pacific Geotechnical Associates, Inc. page 2 Closure'. Repon: Sou~High School 3.0 DOCUMF. NTATION BORINGS 3.1 PURPOSE AND SCOPE When the concentrations of contaminants in the vapor being extracted dropped to a very low level, a documentation boring was advanced to determine if concentrations of gasoline in the soil were below action levels. 3.2 DOCUMF. NTATION BORING LOCATION The documentation boring was located in the center of the contamination plume where the highest contaminant concentrations were found as identified by the site characterization report. The boring was located directly between Vapor Recovery Wells #3 and #4 (Figure 1). 3.3 DOCUMENTATION BORING On October 20, 1992, under the supervision of Ms. Flora Darling of the KCEHSD, a documentation boring was advanced using an AMS extendable hand auger to a depth of fifteen feet below surface grade to determine if contaminants still exist above action levels in the contamination plume (Figure 1). Soil samples were retrieved and analyzed from five, ten, and fifteen feet, the depths with highest concentrations in the site characterization report. The soil samples were sent to BC Laboratory and were analyzed for Benzene, Toluene, Xylene, Ethyl Benzene (BTXE), and Total Petroleum Hydrocarbons as gasoline (TPH-G), using EPA methods 3810/8020. B/T/X/E/TPH-G values at five feet were reported to be 0.005/0.028/2.3/0.15/90 (mg/kg), at ten feet were ND/ND/ND/ND/8.0 (mg/kg), and at fifteen feet were ND/ND/ND/ND/ND. Documentation boring laboratory results are summarized in Figure 1. Laboratory results of the soil samples retrieved indicated that contaminants were either eliminated or reduced to below action levels. After discussing the laboratory findings with Ms. Flora Darling of the KCEHSD, it was determined that no further remedial Pacific Geotechnical Associates, Inc. page 3 Closure RePO, rt~. So High School action, was.. necessay. On November 5, aPproval to terminate the remediation project. 4.0 CONCLUSIONS 4.1 INTRODUCTION The gasoline contamination plume located at South High School has been remediated,' resulting in contamination concentrations below action levels. One documentation soil boring with a depth of fifteen feet was advanced with all soil samples being analyzed for TPH as gasoline and BTXE. A plan view (Figure 1) of the site remediation area is included in this report. 4.2 RISKS Field observations and measurements,, and laboratory analyses indicate that the site does not pose a present or reasonable threat to ground water or to the accumulation of vapors underneath the maintenance building, due to this report's findings of predominantly None Detected and extremely low values of contaminants. 5.0 RECOMMENDATION As a result of the findings described in this report, we recommend the clean closure of the South High School site. The-volume of contamination is sufficiently small, that ongoing dispersion and biodegradation will continue to eliminate any remaining contaminants. 6.0 DESTRUCTION OF VAPOR RECOVERY WELLS All fourteen of the vapor recovery wells located at the site were destroyed in place. The two-inch plastic casings were cut off at approximately two feet below surface grade. The remaining portion of the plastic casings left in the ground was filled with bentonite clay Pacific Geotechnical Associates, Inc. page 4 Closure Report: S High 'School ':.:~i~!~i~!~2~:--~'' t~oughout. The fill mate~al was sufficiendy compacted to eH~nate. any subsidehCe.' All Piping and consiruction was d~sm~tled::and removed from the site. 7.0 CLOSING This Closure Report is intended for the exclusive use of Kern High School District only. Pacific Geotechnical Associates, Inc. assumes no responsibility nor liability for the reliance, herein or use hereof by anyone other than the above named client. In addition, all laboratory work cited in this report was prepared by BC Laboratories, Inc., Bakersfield, which is soley responsible for the contents and conclusions of the laboratory. Respectfully Submitted, Randall T. Metz California Registered Geologist #3995 Michael R. McGrath Geologic Technician Pacific Geotechnical Associates, Inc. page 5 PARKING ~VR#5 (backfilled) MAINTENAN( SHOP ~ VR #1 ND Legend Vapor Recovery Well (Phase I) Vapor Recovery Well (Phase II) Documentation Boring None Detected Contamination Plume (TPH Gasoline) Original Revised Original 6/16/92 9/4/92 ~:.:.:..-~.~-~.<. ............. > 1000 rog/kg ~ 1000 mg/kg ~Geot~hnical Associates, Inc. SOUTH HIGH SCHOOL Plot Plan Documentation Boring Author: PGA I Date: 10/92 Drafted By: PGA I Revised: 12/91 SHL After 4 months of remediation 1 O/9/92 > 1000 rog/kg Figure 1. Scale (ft) WOODSHOP ~ 5! 10' 15' 10 Documentation Borina Benzene 0,005 rog/kg Toulene 0.028 mg/kg Xylene 2,3 mg/kg . Ethyl Benzene 0,15 mg/kg Total Petroleum 90,0 mg/kg Hydrocarbons-Gas Benzene ND rog/kg Toulene ND mg/kg Xylene ND mg/kg Ethyl Benzene ND mg/kg Total Petroleum 8,0 rng/kg Hydrocarbons-Gas Benzene ND mg/kg Toulene ND rog/kg Xylene ND mg/kg Ethyl Benzene ND rog/kg Total Petroleum ND rog/kg Hydrocarbons-Gas PARKING ' (Asphalt covered) Closurc. Repon: S .Hi School APPENDIX A LABORATORY FINDINGS Pacific Geotechnical Associates,. Inc. Petroleum Hydrocarbons PACIFIC GEOTECHNICALASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: MICHAEL R. MCGRATH 324-7768 Date of Report: 10/29/92 · Lab ~: 9558-1 Sample Description: ~515008, SOUTH HIGH SCHOOL: DOC. %1-1 BETWEEN VR ~3. & ~4, 5' (SOIL) 10-22-92 ® 1030 COLLECTED BY M. MCGRATH TEST METHOD: TPH by D.O.H.S. / L.U.F.T.'Manual Method - Modified EPA 8015 Individual constituents 'by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 10/22/92 Constituents Date Sample Received ® Lab: 10/22/92 Date Analysis Completed: 10-28-92 Analysis Reporting Results Units Minimum Reporting Level Benzene 0.005 mg/kg · Toluene 0.028 mg/kg Ethyl Benzene 0.15 mg/kg Total Xylenes 2.3 mg/kg 0.0~ . Total Petroleum Hydrocarbons (gas) 90. mg/kg 1. California D.O.H.S. Cert. #1186 Department SuperviSor Petroleum Hydrocarbons PACIFIC GEOTECHNICALASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: MICHAEL R. MCGRATH 324-7768 Date of Report: 10/29/92 Lab %: 9558-2 Sample DesCription: ~515008, SOUTH HIGH SCHOOL: DOC. ~1-2 BETWEEN VR ~3 & ~4, 10' (SOIL) 10-22-92 @ 1045 COLLECTED BY M. MCGRATH TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents.bY EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 10/22/92 Constituents Benzene Toluene Ethyl Benzene Total Xylenes Total Petroleum Hydrocarbons (gas) Date Sample Received ® Lab: 10/22/92 Date Analysis Completed: 10-28-92 Analysis Reporting Results Units Minimum Reporting Level None Detected mg/k9 None Detected mg/kg None Detected mg/kg None Detected mg/kg 0.'~i~ 8. mg/kg 1.' California D.O.H.S. Cert. $1186 Department Superviso~ "'~:?ili. 4100Ar3as C~c. · ~skersf~eld, ~ ~5~308 · (8(2]~ :327~91 I · F~X (15)0~ 3~7-1 ~I ~1 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL. ASSOCIATES, INC. 4200 EASTON DRIVE SUITE %2 BAKERSFIELD, CA 93309 Attn.: MICHAEL R. MCGRATH 324-7768 Date of Report: 10/28/92 Lab ~: 9558-3 Sample Description: %51500'8, SOUTH HIGH SCHOOL: DOC. ~1-3 BETWEEN VR %3 & %4, 15' (SOIL) 10-22~92 @ 1100 COLLECTED BY M. MCGRATH TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents.by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 10/22/92 Constituents Benzene Toluene Ethyl Benzene Total Xylenes Total Petroleum Hydrocarbons (gas) Date Sample Received ® Lab: 10/22/92 Date Analysis Completed: 10-28-92 Analysis Reporting Results Units Minimum Reporting Level None Detected mg/kg ~,,~~ None Detected mg/kg None Detected mg/kg None Detected mg/kg 0.0,~ None Detected mg/kg 1. California D.O.H.S. Cert. %1186 4100Atlas Ct. · E)ekersfield, GA ~k33019 · 05~ib-] 327-491 i · FAX (80b-') ::5~:::~-1 ~18 APPENDIX B CHAIN OF CUSTODY RECORDS Pacific Geotechnical Associates, Inc. Gf" CHAIN OF CUSTODY RECORd.. eotechnical Associates, Inc. ' :: .. Page 2" A site remediation workplan must be submitted 'to this office for review. Remediation efforts should commence within 60 days of the above date. If you have any questions or desire further information, contact me at (805) 861-3636, Extension 549. FD:cas Sincerely, /"7 Hazardous Materials Special. isf Hazardous Materials Management Program cc: Pacific Geotechnical Associates ~310009.1tr January 9, 1992 Ms. Flora Darling, Hazardous Materials Specialist, Hazardous Materials Management Program Kern County Environmental Health Services Department 2700 "M" Street, Suite 300 Bakersfield, CA 93301 Re.' Remediation Work Plan, South High School Gasoline Contaminated Soil Site Dear Ms. Darling: Pacific G¢otcchnical Associates, Inc. (PGA) has been retained by thc Kern High School District to direct and assist in the rcmcdiation of soil contaminated with gasoline on the campus of South High School in Bakersfield. In response to your letter to the Kern High School District dated October 17, 1991 (attached), PGA is submitting the enclosed work plan for the South High School site. The remcdiation technique to be employed is soil venting using activated carbon. An application for Authority to Construct/Operate has also been submitted to thc San Joaquin Valley Unified Air Pollution Control District. As soon as thc work plan and air permit are approved we will move forward with construction of ventilation wells and activated carbon facilities. '~ If you should have comments , questions or suggestions concerning this project please call me at (805) 324-7768. Sincerely, Brian M. Hirst, R.G. BMH:pld DAVID PRICE i!!' ASSISTANT DIRECTOR · trio :' jAS~S~ A~CS,;Om~c-roa ENVIRONMENTAL HEALTH SERVICES DEPARTMENT October 17, 1991 Kern High School District 2000 24th Street Bakersfield, CA 93301 Attention: Ms. Janet Ford-Shell RE: South High School 1101 Planz Road, Bakersfield, CA Permit: 310009 Ladies and Gentlemen: The Site Characterization Report submitted by Pacific Geotechnical Associates (PGA) for the above-referenced facility has been '_reviewed. The major portion of the contamination lies in an area of approximately 10 feet thickness, beneath the ground surface, with some migration beneath the maintenance building. PGA has suggested the following remediation options: No Action: Denied. Levels of T.P.H. and benzene exceed levels that may be left in place. Portions of the plume have migrated beneath the structure, which may become upwardly mobile and increase risk factors. Soil VentingJCarbon Adsorption: Agreeable to this Department. May require permitting by Kern County Air Pollution Control District. o Vapor Extraction: Acceptable to this Department. This technique is rapid and would minimize the amount of time the equipment would be onsite. It requires permitting by Kern County Air Pollution Control District. .. Excavate: Acceptable to our Department but may not be feasible due to proximity of buildings. 2700 "M" STREET, SUITE 300 BAKERSFIELD, CALIFORNIA 93301 (805) 861-3636 FAX: (805) 861-3429 Kern High School District" October 17, 1991 page 2 A site remediation workplan must be submitted to this office for review. Remediation efforts should commence within 60 ~days of the 'above date. If you have any questions or desire further information, contact me at (805) 86i-3636, Extension 549. FD:cas. Sincerely, . [ ./7 ·.: .//.~ i Hazardous Materials Specialjsf Hazardous Materials Management Program cc! Pacific Geotechnical Associates ~310009.1tr SOUTH HIGH SCHOOL REMEDIATION WORK PLAN Submitted on behalf of KERN HIGH SCHOOL DISTRICT by Pacific Geotechnicol Associates, Inc. 4200 Easton Drive Suite 2 Bakersfield, California 93309 December, 1991 ~'"'~cific ~ Geotechnical Assoclah~ Inc. South High School Site Remediation Work Plan TABLE OF CONTENTS page 1.0 INTRODUCTION ......................... : ............................................................................ 1 2.0 FrI~.D AND/OR LABORATORY STUDIES ....................................... : ...................... 1 2.1 S1TE HISTORY ......................................................................................... 1 2.2 GROUND WATER ..................................................................................... 3 3.0 DF_,SCRIFHON OF REMEDIATION METHOD ........................................................... 3 3.1 IKFRODUCq'ION ....................................................................................... 3 3.2 VAPOR RECOVERY WELLS ..................................................................... 6 3.3 VENTILATION WELLS ........................... ~ ................................................ 8 4.0 REIVIEDIAL ACTIVITY ........................................................................................... 8 4.1 WELL INSTALLATION ............................................................................ 8 4.1.1 Phase I ........................................................................................ 8 4.1.2 Phase II ....................................................................................... 9 4.2 PUMP RATES ......................................................................................... .'.9 4.3 VAPOR TESTING ......................................................................... : ............ 10 4.4 QUALITY ASSURANCE/QUALITY CONTROL ......................................... 10 4.4.1 Purpose ................................................ .' ...................................... 10 4.4.2 Vapor Recovery Wells .............................................................. 10 4.4.3 Documentation Borings ........................................................... 1! 4.4.4 Soil Samples ............................................................................... 12 4.4.5 Vapor Samples ......... : ................................................................. 12 4.4.6 Spoils Disposal and Boring Destruction ................................ 13 4.4.7. Handling and Disposal of Spent Activated Carbon ............. 13 4.5 SITE SECURITY ....................................................................................... 14 5.0 CONCE2q'IR~TIONS OF CONTAMINANTS AFTER REMEDIATION ..................... ' .... 14 6.0 VERIFICATION OF REMEDIATION EFFECTIVENESS ............................................ 14 7.0 HEALTH 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 AND SAFETY PLAN ................................................................................ 15 PURPOSE .................................................................................................. 15 EMERGENCY CONTACTS .......................................................................... 16 PERSONNEL ............................................................................................. 17 WASTES .................................................................................................... 18 ]'OB HAZARDS .......................................................................................... 18 RISK ASSESSMENT ................................................................................. 18 EXPOSURE MONITORING ........................................................................ 19 PERSONNEL PROTECrIVE EQUIPMENT ................................................. 19 WORK ZONES ........................................................................................... 20 DECONTAMINATION ............................................................................... 20 GENERAL SAFETY MEASURES .............................................................. 24 PLAN ACCEPTANCE ................................................................................ 24 page ii South High School Site Remediation Table of Contents - Continued page 8.0 SC]-ll~ · ..................................................................................................... 23 9.0 DATES OF ALL WORK STAGES ............................................................................... 27 10.0 CONTRACTORS AND SUBCONTRACTORS ............................................................... 28 ! 0.1 COMPANIF3 ............................................................................................. 28 10.2 PERSONNEL ............................................................................................. 28 11.0 CLOSING ...................................................................................................... 29 Tables 7.1 HAZARDOUS SUBSTANCES DATA ......................................................................... 21 7.2 EXPOSURE SYMPTOMS AND FIRST AID TREATMENT ........................................ 22 7.3 PERSONNEL DECONTAMINATION .......................................................................... 23 7.4 EQUIPMENT DECONTAMINATION ......................................................................... 23 Figures South High School Site Location Map .............................................................. 2 South High School Plot Plan .............................................................................. 4 South High School Contamination Plume Cross Section ............................... 5 Schematic Well Profile and Treatment System .............................................. 7 A B C Appendices South High School Site Characterization Report Letter from KCEHSD to Kern High School District Approving Soil Venting Remediation Option Soil Venting/Carbon Absorption Treatment System Literature Page iii 1.0 INTRODUCTIO~N During removal o£ a leaking fucl dispenser and associated underground gasoline storage tank, gasoline impaired soil was discovered near the maintenance building at South High School, 1101 Planz Road, Bakersfield, CalifOrnia (Figure 1). On October 11, 1991, Pacific Geotechnical Associates, Inc. (PGA) submitted a Site Characterization Report to the Kern County Environmental Health Services Department (KCEHSD) which recommended a remedial action plan employing soil venting and carbon adsorption to reduce contamination concentration to an acceptable level (Appendix A). Soil venting and carbon adsorption are acceptable to the KCEHSD as a remcdiation option (sec attached letter dated October 17, 1991 referencing Permit //310009, Appendix B). The following remedial action plan is based on the .findings of the Site Characterization Report and employs industry standard soil venting and carbon adsorption. It includes the permitting requirements of the Kern County Air Pollution Control District. 2.0 FIELD AND/OR LABORATORY STIffDIF_-g 2.1 SITE HISTORY Soil contamination was documented during removal of an underground fuel tank and nearby dispenser by McNabb Construction Company. Soil samples taken two feet and six feet below the dispenser recorded 250 and 7,800 pans per million (ppm) Total Petroleum Hydrocarbons (TPH) respectively. Soil samples taken at two feet and six feet below the center of the tank excavation indicated no detectable concentrations of contaminants. Thc cause and quantity of release of product was unknown. Thc Kern County Environmental Health Services Department (KCEHSD) requested that a site characterization be conducted to further study the unauthorized release of gasoline at this site. Pacific Geotect~nical Associates, Inc. page 1 South High School nediation Work Plan On July 23, 1991, a site characterization was performed'by Pacific,. Gcotcchnical Associates, Inc., (PGA), and'a report ..was submitted to the KCEHSD · for approval. A copy of the report is attached as Appendix A. The maximum contamination concentration (11,000 ppm TPH, and 130 pPm Benzene) was encountered at five feet below grade in soil boring B-1. Soil borings B-2 and B-3 (Figures 2 and 3) also encountered TPH and Benzene concentrations above the maximum allowable levels as established by the. L.U.F.T. Field Manual for areas of low leaching potential. The maximum Vertical extent of contamination is approximately 26 feet at the dispenser site. All measured levels of contaminants were at their maximum (5,000 to 11,000 ugm/gm for TPH as gasoline and 3.0 to 130 ugm/gm .benzene) at depths less than ten 'feet below the surface. The volume of soil with contamination levels greater than 500 ugm/gm TPH as gasoline at the dispenser site is estimated at 223 cubic yards and extends to a depth of 26 feet, 183 cubic yards of which is located above ten feet below grade (Figures 2 and 3). 2.2 GROUND WATER The 1989 Water Supply Report published by the Kern County Water Agency indicates that the depth to groundwater in the Summer of 1989 was approximately 160 feet. Ground water is not considered to be threatened by the contamination plume because it is approximately 130 feet below the deepest detectable levels of contamination and further migration of the plumes is not expected due to removal of the sources of contamination. Ground water is not considered to be a factor in this remediation program. 3.0 DESCRIFI'ION OF REMEDIATION METHOD 3.1 INTRODUCTION In accordance with the letter from Ms. Flora Darling of the KC£HSD to Ms. Janet Ford-'Shell dated October 17, 1991, the approved remcdiation method will be soil venting through carbon absorption (copy attached). This process Pacific Geotechnlcal Associates. Inc. page 3 qTENANCE SHOP i.;. COURTYARD" (Concrete) X-Section PARKING VENT ~3 VR ~ TANK SITE )VR ~4 SB~3 DISPENSER SITE i:i:i:i:i:i':'i SB #1 VR #1 VENT #1 Legend Soil Boring (Site Characterization) Proposed Vapor Recovery Well (Phase I) Proposed Ventilation Well (Phase I or II) Proposed Security Fence i Proposed Location of Blower and Activated Carbon Interpreted Maximum Extent of Contamination Plume (TPH Gasoline) ND 500 rog/kg > 1000 mg/kg ' f " ~'"~Pe~fl~ Geotechnical Aeeociatea, Inc. SOUTH HIGH SCHOOL PLOT PLAN O~te: 12/91 10 FEET I IBy: S~L ~_-:'--~"_ 12/91 8MH PARKING (Asphalt covered) Figure 21 -i- GRASS AREA · Plem~note bende, in ~ ~ '~,~' ~.T.T.~, ,::-'~''::: ..... ,. ....... ~ ...... :::: · · · N~ . · ...... .... :::.. ~ .... .~.~e.~.on .... ~ · .~a.~ ........ ............... '.'..':.:.:U:l ' . ...... , ...... · ..~ .......... : : ..... ~ ............... :::: :::::.. ~~-.~- ~'~. ~.r.~--~--5........... m~~~.??. ·.. ~ ......... ~ ~ ~ - _ _ ~~:.:.. ....... ... NW SE SW NW A A' ~e (~) 0' '10' Legend Contamination Plume Concrete ~ Sand  Clay (TPH G~oline) Sand & Silt ~ Sand, Silt & Clay ND 500 z1000 ug~m ug~gm ~orato~ analyses Re~ analyses ~ ~~ ~m., ~. ~ ~ SOUTH HIGH SCH~L B~E OVA field ~ee~ of head~ ga~s ~H-G....To~ P~oleum re~rd~ in ~ ~r million ~ m~hane. Hydr~n .. ~=,.. ,n u== V~ CROSS SECTION A- A' ............ Be~ene in u~g ............ Toluene in u~g _ Well Com~efion ............ Ethyl~ene in u~g ; Pe~rat~ I~ew~ O~ ~: ~UUMfl Dm: 1~1 South High School ~nediation Work Plan 12/16/91 involvcs thc installation of soil vapor rccovcry wells which arc perforated presented in Figure 4. Soil gasses arc withdrawn from the soil when a vacuum is applied 'to thc wells. Volatilization of liquids to thc vapo~ phase occurs as as thc contaminated soil reestablishes vapor phase equilibrium. By continuing thc vapor extraction process, volatile contaminants arc removed from thc soil. Thc vapors move from thc extraction wells via piping to thc processing equipment. They pass first through a ten-micron filter into thc blower assembly and then to a liquid dropout drum. From there they are circulated through two vessels containing approximately 2,000 pounds of granular activated carbon. Thc residual air, stripped of contaminate vapors by the activated carbon, will be vented to the atmosphere. This schematic will be preferred during cooler months when thc relative humidity is high. Should thc project extend into warmer weather thc blower may be placed after the activated carbon vessels in thc flow stream to increase efficiencies. This decision will be made by the project manager. Prior to constructing and operating at the site it will be necessary to obtain an Authority To Construct and Permit to Operate from thc Kcru County Air Pollution Control District. There arc no State or Federal' air permits required for this project. 3.2 VAPOR RECOVERY The proposed vapor recovery wells and their placement are shown in map view on Figure 2. Vapor recovery well VR #1 will extend to 22 feet with a 2 foot completion interval from 20 to 22 feet. Vapor recovery wells VR #2, #3, #4 and #5 will extend to approximately five feet and have a one foot completion interval at thc bottom. Vapor recovery well VR #6 will be slant drilled under the foundation of the Maintenance Shop to a vertical depth of approximately five feet and have a one foot completion interval at the bottom. Figure 3 shows vapor recovery wells VR #1, #2, #3 and #4 in cross sectional view. The vapor recovery wells shown on Figure 3 are the minimum number of wells which will be installed at the beginning of the project. Additional Pacific Geotechnical Associates, Inc. page 6 i!i!!':-.: Maintenance · ~. ~.:'~ ,,,, ..... . . II 2000 Pound vapuf I ~u, 0 Pound :.....? ~.~i~ II ^ctivatod Sample I Aetivatod . ~~ ~ ~ SCHEMATIC WELL PROF!Lg:. · ~. ~ ~}~ AND ' .'" ~'. South High School ~Bediation Work Plan 12l 18/91 vapor' recovery wells may be installed at a later time if testing, indicates they are needed to adequately ventilate thc soil. 3.3 VENTILATION WELLS To assurc cfficicnt vapor rcmoval three vent wells may bc complctcd in the 'upper five fcct of thc soil pr°file. Thc proposed placement of these wells is shown on Figure 3. Installation of the wells will bc decided by thc project manager after thc vapor recovery wells have bccn installed. This decision will depend on whether or not vapor removal will bc enhanced by ventilation wells in the soil types penetrated in thc vapor recovery wells. The construction of these wells will be similar that of the vapor recovery wells as described above,' These wells will be placed outside thc contaminate plumes and will not vent contaminate vapors to thc atmosphere. They will act as entry points for replenishing air to the Soil. 4.0 REMEDIAL ACTIVITY 4.1 WELL INSTALLATION The installation of vapor extraction and ventilation wells will be performed in a two-phase approach to assure optimal extraction conditions are attained. Experience gained during the first phase (Phase I) will be used to determine if additional installations or modifications to the system are necessary. 4.1.1 Phase I Initially 6 vapor recovery wells will be installed as outlined in Section 3.2. Prior to constructing each well, a two-inch diameter hand augered sampling hole will be bored at the designated vapor recovery site. Soil compositions and relative levels of gasoline saturation will be noted. Based on these observations a completion plan will be devised for each well. These borings will then be enlarged to four inches diameter using a portable mechanical augering unit. Pacific Geotechnical Associates, Inc. page South High School ~nediafion Work Plan As shown in Figure 4 thc vapor recovery wells .'will be construCted-of' two-inch PVC pipe with perforations machined on site. The completion interval will be gravcl packed with #3 sand and a two-foot bentonite nnnular seal placed above thc the completion interval. Connecting piping will bc run from the wells to a flow control manifold. All Connccting piping from wells to the control manifold and processing facility will be protected from damage or tampering. Based on the findings of the sampling holes a decision will be made whether to install from one to three ventilation wells outside the contamination plume. These wells would be sampled and completed similarly to the vapor recovery wells. Extraction will commence following the installation of the Phase I wells. The performance of the operation will be monitored and analyzed for at least one month to determine if additional vapor recovery or ventilation wells are require. Additional installations will constitute Phase II development of the project. 4.1.2: Phase II Phase II installation of vapor recovery and/or ventilation wells will be based on analysis of Phase I performance. As many as six additional vapor recovery wells may bc required to adequately ventilate thc soil. Thc completion depths and methods will be similar to that in Phase I. The location of these installations will be dependent on information obtained during Phase I operation. 4.2 PUMP RATES The maximum pump rate for thc one horse power blower to be used is 90 CF/M (cubic feet per minute). A rate of 50 to 70 CF/M is likely based on anticipated pressures for the system. The project is being designed .to run at lower rates to improve thc efficiency of the granular activated carbon. Pacific Geotechnical Associates. Inc. page 9 South High School ~ediation Work Plan 12/16/91 4.3 VAPOR T~3NG Testing for VOC's (volatile organic compounds) in thc vapor stream will be taken upstream of the activated carbon vessels, between vessels and downstream at the point of venting to the atmosphere. Sample ports will be installed at appropriate points in thc system to facilitate in the collection of these samples. Sample ports consist of a valve and probe insert adapter. The probe of the organic vapor analyzer (OVA) draws sample vapors from thc .insert adapter, and VOC's are measured in ppm relative to methane. Vapor measurements will be taken on the following schedule: a) b) c) d) Once each hour during the initial start up of vapor withdrawal operation (Probably thc first one to two days); Once a day'during thc first week of operation; Once a week after operations are under way and sampling is shown to be predictable; Whenever additional samples arc deemed to be necessary (such as when changes are made to the system). 4.4 QUALITY ASSURANCE/QUALITY CONTROL 4.4.1 Purpose This project has been undertaken to remediate the soil at an underground fuel tank site at South High School. Procedures used in the field will generally follow guidelines contained in the State Water Resources Control Board guidance document entitled "L.U.F.T. Field Manual" dated May 24, 1988 (and including 1989 revisions). The field activities will meet or exceed the requirements of the Kern County Environmental Health Services Department's requirements as outlined in its Handbook UT-35. 4.4.2 Vapor Recovery Wells The soil venting effort will consist of drilling as many as 15 vertical borings to a sufficient depth to allow a perforated completion across the zone of contamination. The depth of each boring will be determined in the field by Pacific Geotechnlcal Associates, Inc. page 10 South High School ediation Work Plan the project geblogist with the concurrence of a representative fromm-the-. KCEHSD. The locations of the vapor recovery wells will be determined by measurement from known facilities, and elevations will be estimated from a topographic map. Thc locations and elevations of thc drill holes should be considered accurate only to the degree implied by the method used. Borings will be advanced first with a two-inch hand auger to sample each location for lithology and contamination levels. Logs of the drill holes containing information regarding earth materials encountered, depths and clcw~tion of samples obtained, and thc results of field testing will be prepared. These sample holes will be enlarged to four inches in diameter using- a portable Little Beaver Inc. mechanical auger. Thc vapor extraction and ventilation wells will be completed with two- inch schedule 40 PVC pipe. Thc completion interval ~will consist of a gravel packed perforated pipe. A two-foot bentonite annular seal will be placed above thc gravel packed completion interval. Cement grout will be placed around casing using a trcmic pipe from thc annular seal to thc surface. 4.4.-~. Documentation Borings Documentation borings will be used to determine the efficacy of the vapor recovery procedure. These borings will bc centered in between thc recovery wells. The documentation borings will be advanced using an AMS extendable soil recovery hand auger with a core sampling head capable of retaining a two-inch in diameter by six-inch long brass sampling tube. Documentation borings will be advanced and samples will be collected when field data indicates that soil venting has been established at a constant, low rate. Soil: venting refers to the transformation of volatile hydrocarbons from thc liquid to gas phase. A graph plotting Time of Operation (in hours) versus Vapor Concentrations (in ppm) will be updated with every sample. Pacific Geotechnical Associates, Inc. page 11 South I-IiEh School ~nediation Work Plan 12/16/91 4~4.4 ' Soil Samples Prior to the collection of each sample, sampling equipment will be washed with a non-phosphate detergent solution, triple rinsed with distilled water, and air dried. Soil samples for analyses will be retrieved at five-foot intervals beginning at five feet below grade and at any' change in lithology. Immediately after sampling, sample sleeves will be sealed with Teflon sheets and air-tight caps, taped, labelled, and placed in a cooler containing artificial icc and kept at: or bclow 4°C. Chain-of-Custody forms will bc completed when the sample is collected and maintained with each transfer of the sample. At the end of each day, all samples will bc transported to BC Laboratories, 4100 Atlas Ct., Bakersfield, California, 93308, a California state Certified Laboratory. Soil samplcs will bc analyzcd for TPH as gasoline and BT)CE using EPA methods 3810/8020. 4.4.5 Vapor Samples Vapor samples will be collected by the method described and on the schedule indicated in Section 4.3 above. Samples will be analyzed in the field for volatile organic compounds using a Foxboro Model 128 FID and following the operating instructions which accompany the instrument. With each measurement, a worksheet which indicates the following will be completed: 1) 2) 3) 4) 5) 6) 7) 8) Date of sample; Time of day sample was taken; From which sample port sample was taken; Flow rate from wells at sample port (from flow rate sensor); Flow rate at motor; VOC measurement of contaminates in vapor stream above background (from FID in ppm); Number of operating hours since the last reading; Cumulative, number of operating hours. Pacific Geotect~nical A.~oclates, Inc. page 12 South High School ~aediation Work Plan Vapor analysis will continue on a regular basis (Section 4.3)'throughout thc life of thc project. 4.4.6 Spoils Disposal and Boring Destruction All soil displaced by well installations or other operations will be placed in SS-gallon drums which will be sealed, labeled, and temporarily stored at the site. The drum(s) will then be remediated on site by inserting a slotted extraction probe through the lid into the soil and connecting the probe to the blower/activated carbon system. An intake port will also be opened in the drum lid to allow influx of fresh air into the drum. When field screening of soil in the drum(s) with an OVA indicates the soil is fully remediated, a representative sample will be retrieved for analysis. The sample weighing at least two pounds will be placed in a glass sample jar, leaving no head space. A teflon sheet will be placed over the mouth of the jar, the lid will be firmly secured and sealed with tape. The sample will be delivered to BC Laboratories for analysis of TPH and BTXE using protocols described in Section 4.4. A copy of the analysis will be included in the final site characterization report. All rinsate will be stored and tested for BXTE in a separate drum. Upon verification that soil and liquid in the drums are below action levels with regard to contaminates the contents will be utilized on site for fill or other appropriate USES. All borings not completed as monitoring wells will be backfilled with cement. Borings, vapor recovery wells and ventilation wells will be abandoned by backfilling with cement sand slurry. 4.4.7 Handling and Disposal of Spent Activated Carbon Thc granular activated carbon and vessels will be provided by SUN-AG Inc. Virgin granular activated carbon will be used. SUN-AG Inc. is a licensed transporter of spent carbon and will load and transport thc material to a certified carbon regeneration facility. They will also remove and recondition the vessels at the conclusion of the project. Pacific Geotechnlcal Associates, Inc. page 13 South High School ~ediafion Work Plan 12/16/91 4.5 SITE S~ A temporary security fence will be erected around the soil venting equipment. Barriers and yellow caution tape will be used to demark and bar access to the well, manifold and venting treating area. South High School maintenance personnel will be familiarized with the site and health and safety requirements. Security inspections will be scheduled on a 'regular basis. In case of emergency one of the following will be immediately informed in this order: Randall T. Metz (PGA) Steve Lewis (PGA) Brian Hirst (PGA) (805) 324-7768 or (h) (805) 832-3534 (805) 324-7768 or (h) (805) 832-3809 (805) 324-7768 or (h) (805) 664-9506 5.0 CONCENTRATIONS OF CONTAMINANTS AVIER REMEDIATION Following the guidelines established by the State Water Resources Control Board guidance document entitled "L.U.F.T. Field Manual" dated May 24, 1988 (and including 1989 revisions), the maximum allowable level of Total Petroleum Hydrocarbons for gasoline in an area of low leaching potential is 1,000 parts per million. An application for a declaration of sufficient remediation will be requested when soil samples from documentation borings indicate soil contaminant concentrations below 1,000 ppm TPH (gasoline) at all subsurface levels. 6.0 ~CATION OF REMEDIATION EFFECTIVE~S Documentation borings will be advanced and soil samples taken for analysis when soil venting rates attain a constant, low rate. The borings will be located within the zone of contamination as identified by the site characterization and equidistant from vapor recovery wells. Samples for analysis will be obtained at four feet below grade in areas associated with the shallow contamination plume and at 20 feet in the area where deeper Pacific Geotechnical Associates, Inc. page 14 South High School ~hediation Work Plan contamination is recognized. Soil samples will be analyzed for TPH'and BTXE-' using EPA methods 3810/8020. If sample analyses indicate contaminant levels above the maximum allowable, soil venting will continue for a period of time suitable to reduce concentrations to an acceptable level. After additional soil venting, new documentation borings located in the approximate area of the former borings will be advanced, and soil samples will be taken at the level or levels which contained excess contaminants in the earlier borings. If soil analyses are still above allowable levels, the cycle of soil venting,~ boring, sampling and analysis will continue until a clean sample has been obtained at every five- foot level in the subsurface. 7.0 HEALTH AND SAFETY PLAN 7.1 PURPOSE The purpose of this plan is to provide for worker and environmental Health and Safety during underground fuel tank site remediation, for South High School (Figure 1). The project is summarized in the following list of tasks: Task 1: Preparation of a Site Remediation Work Plan including this Health and Safety Plan. Task 2: Drill at least six and as many as twelve vapor recovery wells to a · depth to sufficient, to allow volatile contaminant vapors to be drawn by pressure r~'duction though the soil, into the wells, and into carbon filled v~-~sels where contaminants will be absorbed. Task 3: Continue vapor recovery from the wells until contamination in the soil is reduced to acceptable levels. Task 4: Prepare and submit a technical report summarizing the results of the site remediation including, but not limited to results and interpretations of data, discussion of methodologies, and a risk appraisal. Pacific Geotechnical Associates, Inc. page 15 South High School .~hediation Work Plan 12/16/91 7.2 EMER~CY CONTACTS In the event an emergency occurs during the remediation program, thc following emergency facilities are available: Police Call 911 Fire Ambulance Hospital 911 or 631-8421 Fire Station No. 5 700 W. Planz Rd. (east on Planz Rd. 4 blocks) 911 Mercy Hospital 2215 Truxtun 327-3371 (west on Planz 1/2 mile, north on H Street 3-1/3 miles, and west on Truxtun 1/3 mile) The following telephone numbers are for South High School. Administration Office 831-3680 Maintenance Shop 831-3680 ext 44 inside the Maintenance Shop will be used as point The telephone communication. of If a medical emergency occurs, the following procedures will be implemented: Minor Cuts or Abrasions. Wash affected area with soap and water and bandage. A first aid kit with eye wash solution must be located on site. The site safety officer is basic first aid trained. Serious Physical Injury_. In the event of serious physical injury: a. Call immediately for ambulance or medical assistance. Pacific Geotecl~nlcal Associates, Inc. page 16 South High School ~aediation Work Plan b. Follow protocols established in thc Medical' Emer_~encv~ ]Reference Manual #1 (Emergency Medical Planning, Inc.) until assistance arrives. Thc site safety officer is basic first trained. c. If an ambulance is not available, transport victim to nearest hospital (Mercy Hospital). The foll(~wing information must be recorded by the project engineer or site officer for any emergency situation as soon as possible: Notifier's name. Date, time, and location of the incident. Nature of emergency (describe what happened). Type and amount of materials involved. Extent of injuries, if any. Agencies and/or organizations notified, names of people notified. Actions taken. 7.3 PERSONNEL Thc following personnel arc expected to bc at thc site during thc remediation project: PGA Kc~3tSD Kcra High School District Randall Metz, R.G., R.E.A. Brian Hirst, R.G. Steve Lewis Mike McOrath Flora Darling Andrew Marinello Mr. Randall. T. Metz is designated as site safety officer and will be responsible for ensuring compliance with this plan at all times. Mr. Metz has completed the 8-hour Health & Safety Supervisors Training course. Mssrs. Metz and Hirst, have completed the necessary 40-hour Health & Safety Training requirements. Pacific Geotechnical Associates, Inc. page 17 South High School ~aediation Work Plan 12/16/91 7.4 WASTES The contaminant to be encountered at the site is gasoline. The specific hazardous substances that are likely to be encountered are shOwn in Appendix A. Applicable exposure data for these substances are presented in Table 1 - Hazardous Substances Data. Symptoms of exposure and first aid treatments for each chemical are presented in Table 2 - Exposure Symptoms and First Aid Treatment. As listed in Table 1, the lowest permissible short-term exposure limit (STEL) concentration is 5 ppm (for benzene). This concentration will be used to establish the requirement to don Level C personnel protective equipment (see Section 7.7). Contaminated boring spoils and rinsate will be sealed in 55-gallon drums, labeled and stored on site pending onsite remediation. 7.5 JOB HAZARDS Chemicals hazards could be encountered from direct skin contact with the contaminated soils or breathing volatilized chemicals in the air. Level D equipment includes standard work clothing and gloves which would reduce direct skin contact with chemicals encountered (see Section 7.4). A flame ionization detector (FID) will be in continuous use in the breathing zone and if organic vapor concentrations of 5 ppm above background are detected, Level C equipment will be donned by all personnel in the' contaminated zone. The respirator should protect workers from inhaled contaminants. Weather conditions have the potential to disrupt the~ project in that if it is raining, drilling and sampling should be postponed. It is unlikely that temperature conditions would preclude completion of thc project. Temperature ranges expected to be encountered are 50°F to 90°F. 7.6 RISK ASSESSMENT The potential for adverse health or safety risks to the on-site workers or the immediate surrounding area is low. Concentrations of the hazardous substances encountered in the previous assessment at the site have been low, Pacific Geotechnlcal Associates, Inc. page 18 South High School ~ediafion Work Plan and it is unlikely that high concentrations will be encountered'esPecially considering that thc source of contamination, thc dispenser and underground fuel tank, has been removed. Since the site is located outdoors, the atmosphcric dispersion of contaminants will bc significant. Special arrangements for possible plant cvacuation should not bc required. No unauthorized personnel may bc Permitted to stand near thc boring location during site remediation. If South High School employees, students, or any other non-essential personnel enter the work site, they will be informed that health and safety procedures have been established to protect both the workers and the public. If they refuse to leave, the South .High School Principal, will be contacted. 7.7 EXPOSURE MONITORING A FID will bc in continuous usc during drilling opcrations. If thc organic vapors in the breathing zone detected by the FID exceed 2.5 ppm above background levels (to be measured prior to excavation and up-wind of the site) for more than five minutes, the personnel in the contaminated zone will don Level C protective equipment, including respirators. Level C 'equipment will be worn continuously in thc contaminated zone until such time as thc FID concentrations are below 5 ppm above background. If FID concentrations measured in the breathing zone exceed 1,000 ppm above background, the site area will be evacuated immediately. Reentry will not be allowed until concentrations are below 1,000 ppm or Level B equipment is provided. Care will be taken in operating the FID to avoid monitoring vehicle exhaust. 7.8 PERSONNEL PROTF_.L"I"IVE EQUIPMENT Level D equipment will be required at all times that the FID measured conccntrations are below five ppm above background. Level D equipment includes: , hard hats · safety boots · eye protection (safety glasses or goggles) · neoprene gloves (while handling samples) Pacific Geotechnical Associates, Inc. page 19 South High School ~ediafion Work Plan 12/16/91 If organic vapor concentrations equal or exceed five ppm above background, all personnel in the contamination zone (see Section 7.9) will don Level C equipment and remain in Level C equipment until organic vapor concentrations arc reduced to below five ppm above background. Level C equipment includes Level D equipment plus: · half-face respirator equipped with combination organic vapor/dust cartridges · tyvek suits PGA will provide Level C personnel protective equipment for its own representatives. If Level C equipment is required, only personnel equipped with Level C equipment will bc allowed to enter thc contaminated zone, which includes thc immediate working area. Anyone other than the PGA representatives and the drillers who desires entry into the exclusion zone under Level C conditions will be required to provide his/her own Level C personnel protective equipment and demonstrate applicable qualifications. The site safety officer or thc designated assistant will ensure that no one without proper personnel protective equipment enters thc exclusion zone under Level C conditions. Level C equipment provided by PGA will be stored in thc PGA vehicle, when not in usc. 7.9 WORK 7_ONES Two basic work zones will bc established for this project: a restricted zone (exclusion zone) encompassing thc drilling area and a clean zone. Only thc exclusion zone may bc formally delineated by a tape barrier. Thc decontamination zone and clean zone will be separated by function only. Final zone boundaries will not be delineated. 7.10 DECONTAMINATION All personnel who have been working in the contamination zone as defined in Section 10 above shall undergo personal decontamination: · when leaving the exclusion zone for coffee or lunch breaks; · at the end of the work day. Pacific Geotechnical Associates, Inc. page 20 South High School ~hediation Work Plan TABLE 7.1 HAZARDOUS SUBSTANCES DATA (all in ppm) Substance PELa STELb IDLHc Odor Thresholdd LEL/UELf (in %) Max. Levels at site' 1 5 Carcinogen 1.4 1.3/7.1 558 ~ Toluene Total Xvlene 100 100 100 125 150 150 2,000 2,000 1,000 2.0 2.1 NEe 1.0/6.7 · 1.2/7.0 1.1/7.0 850 3,842 5,829 a (1987 b d Permissible exposure limit in air for 8-hour day as established by ACGIH update) Short-term exposure limit in air for 15-minute period as established by ACGIH (1987 update) Immediately dangerous to life or health from NIOSH Pocket Guide to Hazardous Substances (1985) As adapted for AH-IA Journal (1987) Not Established Lower Explosive Limit/Upper Explosive Limit from NIOSH Pocket Guide to Hazardous Substances (1985) Pacific Geotechnical Associates, Inc. page 21 South High School ~_~acdiation Work Plan TABLE 7.2 EXPOSURE SYMPTOMS AND FIRST AID TREATMENT 12/16/91 Chemical Route(s) of Entry General Symptoms First Aid Treatment Benzene Inhalation, Inges- tion, Contact Ethylbenzene Inhalation, Inges- tion Toluene Inhalation, Skin Absorption, Inges- tiofi, Contact Xylenes Inhalation, Skin Absorption, Inges- tion, Contact Odor - Aromatic Upper respiratory and GI tract irritation, muscle spasms, slow pulse, extrasystoles, hypokalemia irri- tated eyes, skin burns Odor - Aromatic Irritated eyes and mucous membranes headaches, dermatitis narcosis, coma. EYES - Irrigate im- mediately for 15 minutes SKIN - Water flush immediately ificial respiration and move to fresh air. INGESTION - Medical attention immediately Same as 'benzene Odor - Aromatic Fatigue, weakness, confusion, euphoria, dizziness, headache, dilated pupils, lacrima- tion, nervousness, muscle fatigue, insomnia, paresthesia dermatitis, photopia Same as benzene Odor - Aromatic Same as benzene Dizziness, excitement drowsiness, incoordina- tion, staggering gait, irritated eyes nose or throat, corneal vacuolization, anorexia, nausea, vomiting, abdominal pain, dermatitis Paciflc Geotechnical Associates. Inc. page 22 South High School ~ediation Work Plan The decontamination station shall include the steps listed-' tn-~ Table: 3 - Personnel Decontamination, Steps pertaining to .,equipment that is not in use (e.g., respirators) may be eliminated.' TABLE 7.3 PERSONNEL DECONTAMINATION Decontamination Equipment 1. Outer glove and 1 boot removal 2. Air purifying respirator 1 3. Hand wash 1 4. Hand rinse and dry 1 plastic drop cloth. Set equipment on plastic, wash in soap solution, rinse and dry. plastic drop cloth. Lay equip- ment down, wash in soap solution, rinse and dry. 3- to 5-gallon bucket. Liquid hand soap. 3- to 5-gallon bucket. Paper towels. TABLE 7.4 EQUIPMENT DECONTAMINATION Decontamination Steps Equipment 1. High pressure steam rinse 2. Inspect visually 3. High pressure steam rinse as necessary Steam n/a Steam generator generator Pacific Geotechnical Associates, Inc. page 23 Sou~h High School .~hediation Work Plan 12/16/91 7.11 - GENERAL SAFETY MEASURES The following general safety procedures shall be followed by all persons entering and/or working in the designated work zones: No employee or subcontractor may be allowed on-site without the prior knoWledge and consent of the site safety officer. All personnel at the site shall be advised of the site safety requirements as discussed in this plan. All contractor or subcontractor personnel shall bring to thc attention of the site safety officer or resident project representative any unsafe condition or practice associated with the work activities that they are unable to correct themselves. There will be no smoking, eating, chewing gum, or drinking thc contamina- tion zone. Hands shall bc thoroughly cleaned prior to smoking, eating, or other activities outside the contamination zone. Team members must avoid unnecessary contamination (i.e., walking through known or suspected "hot" zones or contaminated puddles, kneeling or sitting on the ground, leaning against potentially contaminated barrels or equipment, etc. Respiratory devices may not be worn with beards, long sideburns, or under other condition that prevent a proper seal. 7.12 PLAN ACCEPTANCE All personnel involved with this project are required to read this Health and Safety Plan and sign in the space below that they have read this plan and understand its requirements. Prior to beginning work on the first day of the project, the site safety officer shall conduct a site safety meeting to explain the requirements of this plan and ensure that all personnel are familiar with it. Pacific Geotechnical Associates. Inc. page 24 South High School ~ediation Work. Plan Site Safety meetings shall bc hcld at thc bcginning of' cach work day-.:of· the project. Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Affiliation Date Name Affiliation Date Pacific Geotechnical Associates, Inc. page 25 South High School ~ediation Work Plan 0 12/16/91 Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Name Date Affiliation Pacific Geotechnical Associates, Inc. page 26 South High School ~hcdiation Work Plan 8.0 Si~n~m~ As soon as this work plan is approved by the KCEHSD, an application will be made to the Kern County Air P°llution Control District to construct and operate the equipment mentioned in Section 3.0 above. Permitting of this unit could take as long as six months, but it is anticipated to be permitted within four to six weeks from the time is it submitted to the District. Work will commence on the site remediation-within ten (10) days of receipt of the above mentioned air permit providing contractor availability, weather, etc. A time table may look like the following: Time 0 1.5 months 2.0 months 3.0 months 9.0 months 9.$ months Work Plan approved by KCEHSD Air permit received from KCAPCD Phase I drilling initiated. Phase II drilling initiated. Soil analyses indicate acceptable concentrations at all subsurface levels Remedial Action Report submitted to KCEHSD 9.0 DATES OF ALL WORK STAGES Assuming the timetable listed in Section 8.0 comes to pass, and assuming Time 0 is on February 1, 1992: February 1 March 15 April 1 May 1 November 1 November 15 Work Plan approved by KCEHSD Air permit received from KCAPCD Phase I drilling initiated Phase II drilling initiated Soil analyses indicate acceptable concentrations at all subsurface levels Remedial Action Report submitted to KCEHSD 'Pacific Gootechnical Associates, Inc. page 27 South High School ~ediation Work Plan 10.0 CONTRAC'rORS AND SUBCONTRACTORS 12/16/91 10.1 COMPANIES Pacific GCotcchnical Associates, Inc. (PGA) will be prime contractor to Kern High School District for the remediation project at the subject site. PGA will act as project supervisor, attain air permitting, and perform all. geologic analyses and site operations. SUN'AG Inc. will provide thc activated carbon and vessels as well as removal and shipping of the spent activated carbon to a certified carbon regeneration plant. BC Laboratories of Bakersfield will conduct laboratory analyses of thc samples. 10.2 PERSONNEL The project manager will be Mr. IL/IlJ;IIII~MrAI. Mr. Metz is California State Registered Geologist #3995 and Registered Environmental Assessor #3559. He has approximately fifteen years of California geologic experience and has been involved in environmental projects for the last three years including site characterizations and assessments in the Kern County. Mr. Metz served as project manager for a number of ground water, petroleum and environmental projects. The project coordinator is Mr. Steven H. Lewis. Mr Steven H. Lewis earned B.A. degrees in Geology and Business Administration from the University of the Pacific in 1975 and held positions in petroleum development and exploration geology for Gulf Oil Corporation and Santa Fe Energy Company, Inc. from 1976 to 1990. He has broad experience in petroleum and environmental geology in California, Alaska, and Montana, and in performing site characterizations in the southern San Joaquin Valley. The project geologist will be Mr. ~.LL~. Mr. Hirst is California State Registered Geologist #4583 and has approximately fifteen years of California geologic experience. He has been involved in environmental projects for the last three years including the closure of a major east side disposal facility. He has been involved in the preparation of SWAT and HAR reports, and has participated in the remediation planning and execution. Mr. Hirst has also ~articipated in site characterizations and assessments. Pacific Geotechnical Associates, Inc. page 28 South High School ~cdiation Work Plan 11.0 1,211:,6191~ . This remediation plan is intended for the exclusive use of the Kern High School District. Pacific Geotechnical Associates, Inc. assumes no responsibility nor liability for the reliance herein or use hereof by anyone other than the above named client. Randall T. Metz California Registered Geologist No. 3995 Pacific Geotechnical Associates, Inc. page 29 APPENDIX A SOUTH HIGH SCHOOL SITE CHARACTERIT~ATION Pacific Geotechnical Associates, Inc. page 1 SOUTH HIGH SCHOOL SITE CHARACTERIZATION REPORT Submitted on behalf of KERN HIGH SCHOOL DISTRICT by Pacific Geotechnical Associates, Inc. October 11, 1991 South 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 High School Characterization 0 1 O/1 1/91 TABLE OF CONTEN'IS Introduction .................... , ............................................................................... 1 Project Description ....................................................................................... 1 2.1 Site History .......................................................................................... 1 Purpose and Scope ....................................................................................... 2 3.1 Introduction ............................................................................... ~ ......... 2 3.2 Soil Sampling Procedures .............................................................. 2 Findings ...................................................................................................... 3 4.1 Soil Profile ........................................................................................... 3 Evaluation. .... ~ ................................................................................................ 4 5.1 Introduction ........................................................................................ 4 5.2 Dispenser Site ..................................................................................... 4 5.3 Groundwater .... ................................................................................... 5 Conclusions ...................................................................................................... 6 6.1 Introduction ........................................................................................ 6 6.2 Findings ................................................................................................ 6 6.3 Risks ....................................................................................................... 6 Remedial Action 7.1 7.2 7.3 7.4 7.5 7.6 Options ........................................................................... 7 Introduction ........................................................................................ 7 Option 1/ No Action (Natural Biodegradation) .................... 7 Option 2/ Passive Ventilation ..................................................... 8 Option 3/ Vapor Extraction and On Site Incineration ........................................................................................ 9 Option 4/ Excavation, Disposal and Backfill with Clean Soil .............................................................................................. 1 0 Recommendation .............................................................................. 1 0 Statement of Qualifications ...................................................................... 1 1 Closing ...................................................................................................... 1 2 PACIFIC GEOTECHNICAL ASSOCIATES, INC. i i South High School Characterization TABLE OF CONTENTS, Cont.;" LIST OF ILLUSTRATIONS Figure 1 Figure 2 Figure 3 South High School Site Location Map Plot Plan Showing Preliminary Site Assessment Results and Soil Boring Locations and Cross Section Transect Cross section A - A' APPENDICES Appendix A Appendix B Appendix C Logs of Soil Borings Laboratory Results Chain of Custody Documents PACIFIC GEOTECHNICAL ASSOCIATES, INC. i i i South High School Characterization 10/11/91 1.0 Introduction This report details site characterization studies conducted at South High School' grounds, 1101 Planz Road, Bakersfield; California' (Figure 1) on July 23rd, 1991 by Pacific Geotechnical Associates, Inc. (PGA). The work was contracted by Kern High School District. The purpose of this work was to determine the vertical and lateral extent of product plume(s) resulting from a leaking fuel dispenser (which, along with an underground tank, had been removed), assess the potential environmental impact of the contamination and propose at least three remediation options, which are compatible with the nature of the contamination plume and the surrounding cultural conditions at the site. This report contains background information regarding the site, a description of the study methodology, and subsequent findings. An evaluation with conclusions and recommendations for site remediation alternatives are also discussed. The appendices to this report contain a log of the exploratory soil borings, laboratory results and chain of custody records. 2.0 Project Description 2.1 Site History Soil contamination was documented during removal of an underground fuel tank and nearby dispenser by McNabb Construction Company. Soil samples taken two feet and six feet below the dispenser recorded 250 and 7,800 parts per million (ppm) Total Petroleum Hydrocarbons (TPH) respectively. Soil samples taken at two feet and six feet below the center of the tank excavation indicated no detectable concentrations of contaminants. The cause and quantity of release of product was unknown. The Kern County Environmental Health Services Department (KCEHSD) requested that a site characterization be conducted to further study the unauthorized release of product at this site. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 1 South High School Characterization O~. 10~1~19;.1~. 3.0 Purpose and Scope 3.1 Introduction The purpose and scope of this study was to define thc vertical and lateral extent of the product plume associated with the leaking dispenser located at the site, and to ascertain if any product had reached the water table. The sampling program described below was followed to achieve this end. 3.2 Soil Sampling Procedures On February 13th, 1991, two exploratory soil borings, soil borings SB#1 and SB#2, were advanced at the locations shown in Figure 2. .Personnel of PGA performed the soil 'boring operations using an AMS hand auger with an auger head capable of retrieving a two-inch by six-inch soil sample in a brass sleeve. Soil samples were collected and described for laboratory analysis. On July 23rd, 1991, three exploratory soil borings were advanced at the locations shown in Figure 2. Soil borings SB#1 and SB#2 were reentered and deepened. Soil boring #3, a slant hole, was advanced under the foundation of the adjacent maintenance building. Personnel of PGA supervised soil boring operations and collected and described samples for laboratory analysis. Drilling services were provided by Melton Drilling Company of Bakersfield, California. Soil boring locations were selected by PGA personnel based on previous findings, field findings and recommendations made by Flora Darling of the KCEHSD. The positions of the borings were later determined for .mapping purposes using a measuring tape. The soil borings were advanced using a Mobile Drill B-53 drill rig equipped with an eight-inch diameter, continuous flight, hollow stem auger. Samples were collected using a hammer driven, split spoon sampler lined with 2.5-inch by six-inch brass rings. Soil borings SB#1 and SB#2 were both continuously cored by hand to 20.5 feet on February 13th, 1991. Subsequently, soil boring SB#1, was continuously cored for stratigraphic control using the Mobile Drill starting at 20.5 feet, the total depth of the original, hand-augered hole. Soil boring SB#2 was PACIFIC GEOTECHNICAL ASSOCIATES, INC. 2 South High Schoo itc Characterization 10/1 1/91 alternately augered and cored for sampling at five foot intervals with the first sample taken at 20.5 feet. Soil descriptions were made by a geologist under the supervision of .a registered geologist, and consisted of soil type, grain size, color, texture, sorting, inclusions, odor, and other distinguishing features. A Foxborro Model 128/FID Organic Vapor Analyzer (OVA) detector was used to field screen samples for volatile organic compounds (VOC's). This measurement was recorded in parts per million (ppm) as methane, and was taken from a capped brass ring core sample which had been agitated and set in the sun to warm for several minutes. · Samples selected for laboratory analysis had both ends inspected for lithology and were then immediately sealed with laboratory film, plastic covers and secured with duct tape. Each sample was labeled, placed in an ice chest and maintained at 4 degrees Celsius until delivered to BC Laboratories in Bakersfield. Chain of Custody procedures were followed (see Appendix D). All samples were analyzed for benzene, toluene, xylene and ethylbenzene (BTXE), and total hydrocarbon (TPH)as gasoline using EPA methods 8020 and 5030 with a flame ionization detector (FID). The results of the analysis are presented in Appendix B and are summarized in Figure 3. The split spoon sampler and the brass tubes were washed with a non- phosphate detergent and rinsed with water between samples to insure quality control. Boring ceased when successive field screening measurements fell below five ppm using the OVA. After the samples were obtained and the operations complete, the bore holes were filled with concrete. Spoils from the augered soil borings were placed in a 55-gallon drum, sealed and stored on site. 4.0 Findings 4.1 Soil Profile As seen in Figure 3 and Appendix A, the soil profile generally consists of .a thick sequence of fine to coarse grained, moderately well to poorly sorted sand PACIFIC GEOTECHNICAL ASSOCIATES, INC. 3 South High School Characterization .~.i~1,0~I~!it9;1!~ fining downward to sandy and clayey silt. The silt and. clay laycr~at~approx- imatciy 31 feet below thc surface is present in ali threc~borings~~, A'~'~layer~of · intcrbeddcd clay and sand is present in bori~g SB#1 from the surface to approximately 6.5 feet, and a sandy clay layer is present in boring SB#2 from thc surface to approximately five feet. The highest OVA field screening values were recorded above the six-foot depth level in each of the three borings. The highest TPH values were recorded in thc same interval with the exception of a high TPH value (1,100 ppm) at thc 20.5 foot depth level in boring SB#2. No refusal of the auger or sampler was encountered at the site. Visual observations indicated soil moisture levels typical of the vadose zone. There was no indication that the water table was penetrated. Soil boring SB#3 was slant drilled beneath the foundation of the garage beside the dispenser location. The hole was drilled at 21° from the vertical towards the northeast. A detailed description of the soils encountered in the borings is presented in Appendix A of this report. The OVA field screening and laboratory analysis of soil samples are 'presented in Appendix B and C and summarized iff Figure 2. An evaluation of the significance of these findings is presented in Section 5.0. 5.0 Evaluation 5.1 Introduction This section evaluates the' findings of the investigation to better develop conclusions and recommendations regarding this site. The evaluation is based on the results of observations and laboratory data. The purpose and scope of the investigation is to determine the vertical and horizontal extent of gasoline contamination, to ascertain'if any product reached the groundwater, and to present options for appropriate remedial action. 5.2 Dispenser Site The maximum level~ of TPH as gasoline observed in soil boring .gl is 11,000 ugm/gm at five feet. Levels of TPH as gasoline decrease below this depth dramatically with a slight increase at 19.5 feet in the middle of the sand. The PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4 South High School ~[e Characterization 10/1:1/91 levels of TPH as gasoline below 20 feet arc none detected (ND) in-this silt and 'clay iithology at 42.5 feet. Detectable levels of bcnzene'are not observed below 20 feet in soil boring gl. Soil boring #2 and #3 characterize thc lateral extent of of contamination associated with the dispenser. The lack of detectable BTXE and TPH at the tank site (Figure 2) delimits the southern edge of the plume. Soil boring #2 recorded a maximum level of 7,200 ugm/gm TPH as gasoline at a depth of 4.5 to five feet. These levels decreased downwards to ND at 14.5 feet and then increase to· 1,100 ugm/gm TPH as gasoline at 20 feet. Levels of contamination rapidly drop to not detected (ND) in the next five feet. This contamination plume profile is similar to that seen in SB gl (decreasing then increasing) but with a higher level of contamination at the deeper level of increase. Soil boring #3 had no detectable levels of TPH gasoline and BTXE from ten feet (nine feet true vertical depth) to the total depth of 40.5 feet (38 feet true vertical depth, approximately 12 feet inside the area of the maintenance building). Based on the results of soil borings gl, #2, and #3 the contamination plume associated with the dispenser site appears to have levels of TPH as gasoline above 1,000 ugm/gm and benzene levels above 1 ugm/gm restricted· to depths above ten feet except for the sample recovered at the 20 foot level in SB#2. Detectable levels of TPH as gasoline and BTXE extend to a maximum depth of approximately 26 feet under borings SB#1 and SB#2, and have a radius of approximately 11 to 18 feet around soil boring gl at depths above ten feet. Levels of TPH as gasoline greater than 500 ugm/gm extend vertically from eight feet to 25 feet and have a maximum lateral extent of approximately eight to 14 feet around soil boring gl. The approximate volume of soil with TPH as gasoline greater than 500 ugm/gm is estimated at 223 cubic yards. 5.3 Groundwater The 1989 Water Supply Repo~ published by-the Kern County Water Agency indicates that the depth to groundwater in the Summer of 1989 was approximately 160 feet. Groundwater is not considered to be threatened by the contamination plume because :.. is approximately 130 feet below the deepest PACIFIC GEOTECHNICAL ASSOCIATES, INC. 5 South High School Characterization 10~,l~ii:]9!l~il - detectable levels of contamination and further migration of thc plumes is not expected due to removal of thc sources of contamination. ~ 6.0 Conclusions 6.1 Introduction The dispenser site at South High School has been characterized for the vertical and horizontal extent of product plumes associated with leakage. Three soil borings ranging in depth from 33.5 to 40.5 feet were advanced with all soil samples being analyzed for TPH as gasoline and BT)CE. A plan view (Figure 2) and a cross sectional views (Figure 3) of the contamination plume are included in this report. 6.2 Findings The maximum vertical extent of contamination is approximately 26 feet in the dispenser site. All measured levels of contaminants were at their maximum (5,000 to 11,000 ugm/gm for TPH as gasoline and 3.0 to 130 ugm/gm benzene) shallower than ten feet from the surface. The volume of soil with contamination levels greater than 500 ugm/gm TPH as gasoline at the tank site is estimated at 223 cubic yards and extends to a depth of 26 feet, 183 cubic yards of which is located above ten feet below grade. 6.3 Risks This site does not pose a threat to groundwater due to the contamination source having been removed. Significant expansion of the plume is not expected providing that no driving mechanism is introduced (such as excessive surface water percolation). The base of the plume is at least 130 feet above the water table. There may exist a potential for gasoline vapors to accumulate beneath the foundation of the Maintenance Building as a result of vapors rising from the plume associated with the dispenser site. High levels of benzene, in excess of 100 ugm/gm as shallow as five feet may pose a risk to air quality in the immediate area of the maintenance building. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 6 South High School Characterization 7..0 'Remedial Action' Options 7.1 Introduction Four remedial options are presented for the dispenser site. into consideration the following: These options take The sites do not pose an immediate.threat to groUndwater. Potential migration routes of thc contaminants include downward migration due to excessive percolation of surface waters and upward migration of volatile vapors. Vapors from the sites could pose .potential concerns. Supervision, testing and quality control for any of the mitigation alternatives has been included in these cost ~analyses. These estimates have been developed only for providing a general comparison between the 'four alternatives and should not be used for preliminary budgeting purposes. 7.2 Option 1/ No Action (Natural Biodegradation) No remedial action will be taken. The dispenser site will be resurfaced to meet the needs of the maintenance garage and the soil boring spoils will be removed to a proper disposal facility. Concentrations of contaminants will decrease with time due to; 1) the removal of the sources of product and 2) natural biodegradation processes which are already active. The time required for TPH gasoline and BTXE concentrations to be reduced significantly or to non-detectable levels in the soil cannot be known. Containment by surficial concrete and asphalt may isolate contaminant vapors from human activity. A notice will be posted inside and outside the Maintenance Building informing the public that gasoline contaminated soil is present beneath the driveway and garage and where information concerning the contamination can be found. This option is feasible and will cost $500 or less to implement. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 7 South High School Characterization :l:0hl~F[9,1i., 7.3 Option 2/ Soil Venting with Carbon Adsorbers '~' -' .... ............. : ....... Three vent wells and possibly as many as three or more air sUpply wells, will be installed near the south corner of the Maintenance Building. One of the vent wells will be drilled on a slant under the Maintenance Building foundation. The wells will use a PVC completion with perforations from total depth to 1.5 feet below the surface. A surface facility consisting of PVC piping, a regenerative blower and two 2000 lb. vessels containing activated carbon will be installed along the southeast wall of the Maintenance Building. The gasoline contaminated, vapor will be drawn through the vessels where the contamination will be scrubbed from 'the air stream by adsorption onto granulated, activated carbon. The system will operate at a relatively low rate, between 10 and 75 cubic feet of air per minute, continuously or intermittently. At least 50% to 60% of the contamination will be remediated in this fashion, while natural processes such as dispersion and biodegradation will reduce the remaining contamination in the soil to below action levels. The process will be monitored by regular sample taking and lab analysis. A thorough risk assessment will be conducted to identify and analyze all sources and receptors of contaminant vapors. The ventilation at the dispenser site will greatly reduce the hazard of vapors that may accumulate, beneath the foundation. Concentrations of contaminants will decrease with time due to; 1) the removal of the sources of product and 2) natural biodegradation processes which are already active and 3) ventilation and scrubbing of vapors drawn from the plume. The time required for TPH gasoline and BTXE concentrations to be reduced significantly or to non- detectable levels in the soil cannot be known precisely, but it is estimated that one year of operation is required. A notice will bc posted inside and outside the Maintenance Building informing the public that gasoline contaminated soil is present beneath the driveway and foundation and where information concerning the contamination can be found. This option is feasible and will cost approximately $28,000 to implement. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 8 South High School Characterization 7.4 'Option 3/ Vapor. Extraction and On Site Incineration 10/1'1/91 A vapor extraction system (VES) will be installed to remove and incinerate soil gases. Fourteen soil vapor extraction wells will be installed near the south corner of the Maintenance Building. Soil gas will be drawn from the soil when a vacuum is applied by a motor designed to incinerate the extracted gas. All fourteen wells will be connected to a manifold that will allow for selective venting or extraction so as to optimize the extraction process. By continuing the process, volatile contaminants will be removed from the soil. 'Contaminant-saturated vapors are drawn into a liquid dropout drum, through a ten-micron filter and into the carburetor of a water cooled, six-cylinder internal combustion engine.. The engine burns the hydrocarbons, and the exhaust is passed through a three-way catalytic converter which oxidizes hydrocarbons and carbon monoxide. The exhaust nitrogen oxides also undergo a reduction reaction in the converter. A muffler will be installed on the engine exhaust. The VES engine will be situated in a sound-proofing enclosure, and all wells and control equipment will be located within a locked, eight-foot storm fence. Due to the proximity of residences, it is recommended that the VES be active ten hours per day, during the daylight hours. The benefit is twofold. First, the impact on ambient sound levels will be less noticeable during the day, and second, down time will afford equilibration within the reservoir and may improve overall efficiency. Concentrations of contaminants will decrease with time due to the removal of product and replacement by ambient air and subsequent dilution. The time required for TPH gasoline and BTXE concentrations to be reduced significantly or to below action levels in the soil can be estimated at a minimum of 45 days. Upon soil testing that demonstrates TPH and BTXE concentrations below action levels as determined by a representative of the KCEHSD the VES will be removed, wells abandoned, concrete patched, and asphalt restored to specifications acceptable to the KHSD. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 9 South High School Characterization . A notice 'will be posted inside the Maintenance Building ~d on least ' two places informing the public that gasoline ~. contaminated~-~ ~oii~ present beneath .driveway and garage foundation and where info~ation concerning the contamination can be found. This option is feasible and will cost at least $20,000 to implement. 7.5 Option 4/ ExcaVation, Disposal and Backfill with Clean Soil Excavation and backfill with clean soil will be used to reduce the concentration levels of TPH as gasoline and BTXE in the soil. Shoring of the Maintenance Building using piles and lagging or by using a process that trenches and pours a retaining wall in one pass prior to excavation will be necessary to ensure the structural integrity of the foundation. It should be noted that proximity to the Maintenance Building is critical to ensuring optimum elimination of the contaminated soil. The contaminated soil will be transported to a Class I disposal site, and the excavated area will be backfilled with clean soil. Roughly 80 per cent of the contamination will be removed by excavation to a depth of ten feet, and within one foot of the Maintenance Building. Thc soil under thc Maintenance Building will be remediated using the technique described in Option 2, above. Excavation will' continue until OVA readings fall to 0 ppm above background. The soil under the Maintenance Building will be vented until soil samples fall below action levels for TPH as gasoline and BTXE as determined by the KCEHSD. This option is feasible and will significantly reduce contamination levels in the soil. The cost for implementing this option is estimated to cost at least $40,000. 7.6 Recommendations Two remediation options are recommended for this site: Option 2 is recommended as the most unobtrusive action alternative which will also address potential safety hazards associated with thc dispenser site. Biodegradation is a natural process which is presently active and will continue. The threat to the water table by the existing plume is minimal. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 10 South High School Characterization 0 10L1 1/91 Option 2 has the potential to perform at a greater than expected efficiency ~ duc to the concurrent natural' processes and the increased contact-time~ between. contaminant vapors and carbon because of the low flow rates planned. Option 3 is recommended as the most timely remedial action alternative. It involves less engineering risk than Option 4 but could take longer than expected, and carries with it the greatest noise risk to the surrounding environment. It should be noted that while Option 2 is relatively quiet it may be viewed as incomplete considering the extent to which natural processes present at the site are expected to contribute to the reduction in contaminant concentrations. Option 3 risk is that project length could be extended due to diminishing efficiencies as soil contamination concentrations decline toward the end of the project. 8.0 Statement of Qualifications This document has been prepared by Steven H. Lewis, Project Geologist. Mr. Lewis began practicing geology in 1976 in California, and has broad experience in petroleum and environmental geology. The preparation of this document has been supervised by Randall T. Metz, a Registered Geologist of the State of California (#3995). Mr. Metz has participated in a number of site assessments including assessments of properties involving oil field activities. He has been practicing geology in California since 1976 and has published several articles on San Joaquin Valley geology. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 11 South High School Characterization 9.0 Closing This report is intended for thc exclusive usc of Kern High School DistricL Pacific Gcotcchnical Associates, Inc. assumes no responsibility nor liability for the reliance herein or use hereof by anyone other than thc above named client. In 'addition, all of thc laboratory work cited in this report was prepared under the supervision of the certified personnel of SMC Laboratory and BC Laboratories, Bakersfield, which arc solely responsible for thc contents and conclusions of thc respective laboratories. Respectfully submitted, Steven H. Lewis Project Geologist Randall T: Metz ~ Calif. Reg. Geologist #3995 PACIFIC GEOTECHNICAL ASSOCIATES. INC. 12 SOUTH HIGH SCHOOL Rgure I LOCATION MaP ': ,!~!-, ..... ·, ,, · 1/2mile ... ' .04lB: Sq)L I1, IBgO JBy: .LMm "',' :;,: Pm~cl: 854301 J ~: 1~ ~A ' MAINTENANCE SHOP ,!-!'!'I-! WOODSHOP PARKING 2' - 250 ppm 6' - 7800 ppm SB~I Old Dispenser Location (backfilled) Legend {~1 SB #1 Soil Boring Contamination Plume (TPH Gasoline) ~; 2' - 1,700 ppmI [6'- ND 500 mg/kg Tank Location > 1000 mg/kg x Sample Location From Prelim. Site Assessment: Depth below tank - ppm TPH ND = Not Detected ~~p,~fl~ Geotechnical Ae.~c~,iatee, Inc. SOUTH HIGH SCHOOL PLOT PLAN 10 FEET I Figure 21 GRASS AREA PARKING (Asphalt covered) " * "~. .*. . SOII*'.BORING:~:'.' ...... -- ...... ': ...... ..... ....... '-~':'*Pfi~note berlclS in .i .......... ~:::.'' ;;~-: ..-..-..:.~:.~ ~g~i~~gL~- .....,,~ ·../.,~,,~,0,,,.~.. "'"'.".;%'~.,r~. ~~4.T.4-'. · ..' ,o ....... .*'.. .. : ..... :[ ....... .... ,o~oao.~'~Z~'~. · · ~_. · ·; ~.;; !. ;~;I; . . aa ........ .......... ,,. '.~"~.. ~ ~'~..L~ ,,_.~.N.~O~e.~ ....... ........... / ..... .o~.,~.o~ .... %r'1 . · *%1~-~ · · .'"*"~"",*~.. : ...... · . .o ~''~ ........ ~ ...... t''''~i==--''''~''" .... _,' ::".~.~..~.: .~-../..c~..:: ~ :! ~' :':.~" 't"~~.- · -~ ...... -- : :. ::: :: :/:: :::: .o~.~; .'~-~ i .5LL;~.~: I:::::: i H:i :NL:-'::..- ....... ., . ...... ./. ~ ........ -,,,,~ ..,,,~.,,.: · · ~ j ~ ..~.. ,~ ....... ·.'''__''~'' ..... '..... ~__.,,..i~~'-~"~'' aa"" · ...... · . ,o ..... g" ........ ,oa~o.-'~.. ~ .c~ :-~,o.~o,,o,o ........ ., ::::::::::::::::::::::::::::::::: , ...........'~ ~"'""' lffi ~lffi ......... :" ' lffi ......... ~0_ '::~. --::::::: ,~_~ ~ ....... ,~, ........ ~ ,. ~.._.-~.;: ~'.-~ ~_.............._............: ? ,,, ' ....... ~~,~:..~,~..cs~. ;~.~:,:,:. :-. .'-. '-- '~;,-.;-. '-. '-. :-- : .-: .-: .-:;.'* ' -~~"..aO~lO~l;~lO'.~'.--.--; -'.--.--.--.--a .--'.-'. _ ~ *~ --' -' *~ ' ' . ~..-m .-..-..-4......... ~ ~ ......,-..~.- ~~- .--T-.-..--T-T-T.--.-.-.-. · ~ ,...~%'~.;.'~'.---"~"~'-- ..... ',,--' .--' .--'., ........ . ' ...... 40'- .. · ' NW SE SW NW -' A A' Scale (Feet) ~)' 10' 20' Legend ~ ¢oncr,te [~] Sand Oontamination Plume ~Clay (TPH Gasoline) ~ Sand & Silt Sand, Silt & Olay ND 500 >1000 ugm/gm u§m/gm Laboratory analyses Field analyses ~-~ B/T/X/E OVA field screening of headspaco gases SOUTH HIGH SCHOOL 'I'PH-G....Total Petroleum recorded in parts per million as methane. Hydrocarbon as Gasoline in ug/g s ............ Bo.~enoinu~g CROSS SECTION A- A' T ............ Toluene in ug/g X ............ Xylene in ug/g E ............ Ethylbenzene in ug/g Author:, SHL I I Figure 3 omftee ay: SIlL I e.-=-_: sat . I South.' High': SChoo ~itc,- Characterization APPENDIX A Logs of Soil Borings PACIFIC GEOTECHNICAL ASSOCIATES, INC. Property Owner: Site Ad.ess: Ddlling Conffator: KERN HIGH SCHOOL DISTRICT SOUTH HIGH SCHOOL MELTON DRILLING COMPANY OVA: FOXBORO 128 FID Driller: MICHEAL BRAYSON Boring # SB~I Location:* CENTER OF DISPELS.. PGA Personnel: R. METZ~ M. MCGRATHr MWF ~ PGA Job #: SIS003 Date: 2/13~7/23/91 i; Drilling Melhod: HOLLOWSTEM AUGER/HAND AUGER Ri~ Type: .,MOBIL B-53 Total Depth: 33.5 Elev.: GROUND LEVEL Hole Diameter: 8' Time - Start: 11:20 End: 14:00 Sample Equip: 18' SPLIT SPOON/2' BRASS SLEEVES CORE REC. DEPTH BLOW LOG USCS TYPE MOD. # % TOP BDT CNT COLOR TEXT. SORT. STAIN ODOR OVA TIME # PPM ASPHALT CONGLOMERATE SUGHTLY PLASTICf POSSIBLE FILL SUGHTLY PLASTIC GRAVEL 2' IN DIA. WET >50% 1/2' LONG PIECE OF WOOD '>50% GRAVEL 1' IN DIA. MICACEOUS VERY SUGHT ODOR SUGHT SUGHT PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 1 of 3 · Property Owner: KERN HIGH SCHOOL DISTRICT Site Address: SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID Drilling Contrator: MELTON DRILLING COMPANY Driller: MICHEAL BRAYSON Boring # SB~! Location: CENTER OF DISPEN. PGA Personnel: R. METZ~ M. MCGRATHr MWF ~.;:~:.. ,, ,~ PGA J~b #: SIS003 Date: 2/13,7/23/91 .". .~. .~ . Drilling Method: HOLLOWSTEM AUGER/HAND AUGER Rig Type: MOBIL B-53 Total Depth: 33.5 Elev.: GROUND LEVEL, Sample Equip: 18' SPLIT SPOON/2' BRASS SLEEVES Hole Diameter: 8' Time - Start: 11:20 End: .14:00 ¥ ~.~:.~'~ .................... :.:.¥ .?~.~:~:~:~.~. ~.~.i:~. ~:~..'.. ~[~*~.[~:~.~.<~:~ :~:~:~..'..~:~:.~ ~.:.'.~:~:~.~:~,~-~*~:~,~{.~=[~ Y, ............. ?..: ..... : ........ :. ~,~ '~ ~,. ~. .... ~ ' · *~ CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM SUGHT SUGHT SUGHT "" * SUGHT NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 2 of 3 SAND FINE TO COARSE MEDIUM FEW MEDIUM GRAVEL FINER GRAIN, ~l- POSS. RLL Site Address:. . SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID Drilling Conffator: MELTON DRILUNG COMPANY Driller: ' MICHEAL BRAYSON Drilling Method: HOLLOWSTEM AUGER/HAND AUGER Rig Type: MOBIL B-53 KERN HIGH SCHOOL DISTRICT Boring # SBill location: CENTER OF DISPEN. ' PGA Personnel: R. METZ~ M. MCGRATH~ NIWF '-. *' ~: PGA Job il: 81S003 Date: 2/13~7/23/91 .... ;::'/, Total Depth: 33.5 Elev.: GROUND LEVEL Sample Equip: 18' SPLIT SPOON/2' BRASS SLEEVES Hole Diameter: 8' Time - Slart 11:20 End: 14:00 ' ' · CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # % TOP BOT CNT PPM 7 75% 30.0 30.5 28 '""""' SW SAND YLW/BRN VF/MED MOD/PR NONE WEAK 10:03 B OTHER DEPTHS NO ODOR - .". :..~ .-. 8 75% 30.5 31.0 30 i i!!~ SW SAND YLW/BRNJ VF/MED MOD/PR NONE WEAK 8 90% 31.0 31.5 75 ML SILT CLAY YLW/BRN MSV POOR NONE WEAK ND SANDY SILT TO SlLT CLAYEY~ FINE 8 100% 31.5 32.0 55 ML SILT CLAY!YLW/BRN MSV MD/PR NONE WEAK 9 50% 32.0 32.5 38 ML SILT CLAY YLW/BRN MSV MD/PR NONE WEAK 9 JO(P/. 32.5=33.0 22 ML SILT CLAY YLW/BRN MSV MD/PR NONE WEAK ND 9 100% 33.0 ! 33.5 18 ML SILT CLAY YLW/BRN MSV MD/PR NONE WEAK 10:27 C VERY FINE GRAINED SAND 33.5 34.0 COMPLETED BORING DUE TO ND 34.0 34.5 OVA READINGS AND APPARENT 34.5 35.0 CLEAN SAMPLES PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 3 of 3 Property Owner: KERN HIGH SCHOOL DISTRICT Site Address: SOUTH HIGH SCHOOL 1101 PLANZ ROAD OVA: FOXBORO 128FID Drilling Con~'ator:. MELTON DRILUNG COMPANY Driller: MICHEAL BRAYSON Boring # SBfK2 Location: 145°NW~T OF SB PGA Personnel: R. MET'~ M. MCGRATH~ RWF PGA Job #: SIS003 Date: 2/13f7/22/91 Rig Typ~,,: MOBIL B-53 Total Deplh: 36 Elev.: GROUND LEVEL Hole Diameter: 8'12' Time - Start: 14.'00 End: 16:00 Drilling Me~lod: 2' HAND AUGER/HOLLOWSTEM AUGER Sample Equip: 18' SPLIT SPOON/2- BRASS SLEEVES CORE REC. DEPTH # % TOP BOT ~..~<....~..~.~>: ....................... ~ ~ ....~ ~<~~:~ ~:~:~ BLOW L~ ~ ~PE MOD. ~LOR T~. SORT. STAIN O~R OVA TIME CNT PPM STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG STRONG PACIFIC GEOTECHNICAL ASSOCIATES, INC. TOP 2' ASPHALT ~,UGERED TO 20' USING HAND AUGER WET PAGE t of 3 'Property Owner: KERN HIGH SCHOOL DISTRICT Site Ad.ess: SOUTH HIGH SCHOOL 110t PLANZ ROAD OVA: FOXBORO 128FID Boring # SB#2 Localion: 145°NWfT OF SB 1 PGA Personnel: R. METZ~ M. MCGRATHf RWF Drilling Conlrator: MELTON DRILLING COMPANY Drillec. MICHEAL BRAYSON PGA Job #: SIS003 Date: 2/13~7122/91 Drilling Method: 2- HAND AUGER/HOLLOWSTEM AUGER Sample Equip: 18' SPUT SPOON/2' BRASS SLEEVES Rig Type: MOBIL B-53 Total Depth: 36 Bev.: GROUND LEVEL Hole Diameter: 8'12' Time- Start: 14.t)0 End: 16:00 CORE REC. DEPTH BLOW # % TOP BOT CNT LOG USCS TYPE MOO. COLOR TEXT. SORT. STAIN ODOR OVA TIME # PPM AUGERED AHEAD AUGERED TO 25' WITH MOBIL B.~3t FIRS'I SAMPLE TAKEN AT 25' AHEAO PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 2 of 3 .Propert~ Owner: KERN HIGH SCHOOL DISTRICT SiteAGGess: SOUTH HIGHSCHOOL 1101 PLANZROAD Boring # OVA: FOXBORO 128FID Drilling Gofltra~o~: MELTON DRILLING COMPANY Driller: MIGHEAL BRAYSON Drilling Method: 2' HAND AUGER/HOLLOW~EM AUGER SBt2 I---n"~'--~on: 145°NW~? OF SB 1 PGA Personnel: R. ME'I7~ M. MCGRATHr RWF PGA Job #: SI-__~30_3 Date: 2/13t7/22/91 Rig Type: MOBIL B.-53 Total Depth: 36 Etev.: GROUND LEVEL Hole Diameter: 8'/2' Time - Staff: 14.tX) End: 16:00 Sample Equip: 18" SPUT SPOON/2- BRASS SLEEVES CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # # % TOP BOT CNT PPM 2 70% 30.0 30.5 13 ~M SAND SILTY GRY/BRN VF/MD POOR NONE NONE 2 70% 30.5 31.0 17 ~Vl SAND SILTY GRY/BRN VF/MD MODPR NONE NONE 13:35 B VERY SILTY SAND FINING DOWNWARD 2 70% 31.0 31.5 15 J~BBIsc SAND CLAY YLW/BRN VF/MD MOD PR NONE NONE ND SILTY CLAY LAM. 2-4' AT BOTT'OM 31.5 32.0 · 32.0 32.5 I 32.5 33.0 AUGERED AHEAD 33.0 33.5 33.5 34.0 34.0 34.5 34.5 35.0 3 35.5 36.0 11IJJJJ ML SILT CLAY BROWN MSV POOR NONE NONE 13:45 C VERY CLAYEY. COMPLETED HOLE WITH 3 36.0 36.5 16 ML SILT CLAY BROWN MSV POOR NONE I NONE ND THREE CONSECUTIVE ND/LOW ! OVA 36.5 37.0I READINGS PACIFIC GEOTEGHNICAL ASSOCIATES, lNG. PAGE 3 of 3 # % TOP BDT CNT Property Owner: KERN HIGH SCHOOL DISTRICT Boring # SB#3 Localion: SEE PLAT. Site Ad,~ess: SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID PGA Personnel: S. LEWIS, T. NUNNINK Drilling Contrator: MELTON DRILLING COMPANY Driller:. MICHEAL BRAYSON PGA Job #: SIS003 Date: 7/23/91 Ddlling Method: HOLLOWSTEM AUGER Rig Type: MOBIL B-53 Total Depth: 40.5 Bev.: GROUND LEVEL Sample Equip: 18' SPLIT SPOON Hole Diameter: 8' Time - Start: 10:55 End: 12:45 ~~IN"..A.-'~ I fltl i~ '~'' ?''''' ........:~' ~:~'~ ...................................................................................................................................................... ~.:.:.:.:.:.:..: .................... .,.: CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # PPM 0.0 0.5 0.5 1.0 1.0 1.5 1.5 2.0 2.0 2.5 2.5 3.0 3.0 3,5 3.5 4.0 I 70% 4.0 4.5 17 1 70% 4.5 5.0 12 1 70% 5.0 5.5 ? 5.5 6.0 6.0 6.5 6.5 7.0 7.0 7.5 7.5 8.0 8.0 8.5 8.5 9.0 2 80% 9.0 9.5 8 2 80% 9.5 10.0 10 2 8O% 10.0 10.5 12 10.5 11.0 11.0 11.5 11.5 12.0 12.0 12.5 12.5 13.0 13.0 13.5 13.5 14.0 3 90~ 14.0 14.5 12 3 90% 14.5 15.0 20 SP SAND GREY MED MOD NONE NONE AUGERED AHEAD SP SAND GREY MED MOD NONE NONE SP SAND GREY MED MOD NONE NONE SP SAND GREY MED MOD NONE STRONG ESTIMATED-BORINGS (~SURFACE SP SAND GREY MED MOD NONE STRONG STRONG ODOR SP SAND GREY MED MOD NONE STRONG SP SAND GREY MED MOD NONE STRONG SP SAND GRY/BRN FN/MD MD/PR NONE STRONG SM SAND GRY/BRN FN/MD MD/PR NONE STRONG OCCASIONALY SILTY SP SAND GRY/BRN FN/MD MD/PR NONE S'rRONG >1000 SP SAND GRY/BRN FN/MD MD/PR NONE STRONG 11:09 A AUGERED AHEAD THROUGH SAND SP SAND GRY/BRI~ VF/MD POOR NONE STRONG ML SILT CLAY GRY/BRI~ MSV POOR NONE STRONG 45 VERY SILTY~ CLAYEY ML SILT CLAY GRY/BRI~ MSV POOR NONE STRONG 11:23 B AUGERED THROUGH SAND~ FINE TO MEDIUM GRAINED sp s^.o MED MD R .ONE F^,.T 14 PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 1 of 3 Pmpert7 Owner: KERN HIGH SCHOOL DISTRICT Boring # SB~3 I__~ca__tion: SEE PLAT. Site AG/~ess: ,SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID PGA Personnel: S. LEWlS~ T. NUNNINK Drilling Con~ator: MELTON DRILLING COMPANY Ddller: MICHEAL BRAYSON PGA Job #: SIS003 Date: 7/23/91 Ddlling Method: HOLLOWS~I=M AUGER Rig Type: MOBIL B-53 Total Depth: 40.5 Elev.: GROUND LEVEL Sample Equip: Hole Diameter: 8' Time - Start: 10:55 End: 12:45 18' SPLIT SPOON CORE REC. DEPTH BLOW LOG # % TOP BOT CNT 3 90% 15.0 15.5 20 15.5 16.0 16.0 16.5 16.5 17.0 17.0 17.5 17.5 18.0 18.0 18.5 18.5 19.0 4 70% 19.0 19.5 21 4 70% 19.5 20.0 29 4 70% 20.0 20.5 37 20.5 21.0 21.0 21.5 21.5 22.0 22.0 22.5 22.5 23.0 23.0 23.5 23.5 24.0 5 90% 24.0 24.5 20 5 90% 24.5 25.0 30 5 90% 25.0 25.5 30 25.5 26.0 26.0 26.5 26.5 27.0 27.0 27.5 27.5 28.0 28.0 28.5 28.5 29.0 6 70% 29.0 29.5 23 6 70% 29.5 30.0 50 USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # PPM SP SAND YLW/BRN MED MD/PR NONE FAINT 11:30 C AUGERED AHEAD SP SAND ORG/BRN FN/MD MD/PR NONE V FAINT SILTY SP SAND ORG/BRN FN/MD MD/PR NONE V FAINT 11:39 D SP SAND ORG/BRN FN/MD MD/PR NONE V FAINT 2 AUGERED AHEAD SP SAND YLW/BRI~ MED MOD NONE NONE SP SAND YLW/BRh MED MOD NONE NONE 11:47 E SP SAND YLW/BRI~ MED MOD NONE NONE 3 I AUGERED AHEAD SP SAND YI.W/BRI~ MED' MOD NONE NONE OCCASIONAL FINE TO VERY FINE SP SAND Yt.W/BRI~ MED .MOD NONE NONE 11:58 F PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 2 of 3 properly Owner: KERN HIGH SCHOOL DISTRICT Site AG,~us,~: SOUTH HIGH SCHOOL OVA: FOXBORO 128 FID Ddlling Conb'ator: MELTON DRILLING COMPANY Driller: ' MICHEAL BRAYSON Drilling Method: HOLLOW~.M AUGER Boring # S1~3 Localion: SEE PLAT. PGA Personnel: S. LEWISt T. NUNNINK PGA Job #: S1~3__3 Data: 7/23/91 Rig Type: MOBIL B-53 Total Depth: 40.5 Elev.: GROUND LEVEL Sample Equip: 18' SPLIT SPOON Hole Diameter: 8' Time - Start: 10:55 End: 12:45 # % TOP BOT CNT ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: · · .......... ,?. ~ , .~ ~:~.::::: :~:~:~ :~i:~:.~m ~J~.:~:: :~: :~:: .'..~: :~ :~.~.~ CORE REC. DEPTH BLOW LOG USCS TYPE MOD. COLOR TEXT. SORT. STAIN ODOR OVA TIME # PPM 6 70% 30.0 30.5 43 30.5 31.0 31.0 31.5 31.5 32.0 32.0 32.5 32.5 33.0 33.0 33.5 33.5 34.0 7 90% 34.0 34.5 35 7 90% 34.5 35.0 55 7 90% 35.0 35.5 NP 35.5 35.0 36.0 36.5 36.5 37.0 37.0 37.5 37.5 38.0 35.0 38.5 38.5 39.0 8 39.0 39.5 11 8 39.5 40.0 16 8 40.0 40.5 21 SP SAND YLW/BRI~ MED MOD NONE NONE ~.8 AUGERED AHEAD SM SAND SILT GRY/BRN FN/MD MD/PR NONE NONE 3 CLAY~ VERY SILTY ~ NEAR 35' SM SAND SILT GRY/BRN VF/FN MD/PR NONE NONE 12:14 G SM SAND ~ILT GRY/BRN VF/FN MD/PR NONE NONE AUGERED AHEAD ML SILT CLAY GRY/BRN V FINE POOR NONE NONE SANDY VERY FINE GRAINED SP SAND GRY/BRN V FINE POOR NONE NONE 12:26 H COMPLETED WELL BASED ON LOW' SP SAND GRY/BRN V FINE POOR NONE NONE 0.8 OVA READINGS PACIFIC GEOTECHNICAL ASSOCIATES, INC. PAGE 3 of 3 South High School Characterization Laboratory Results PACIFIC GEOTECHNICAL ASSOCIATES, INC. SMC Laboratory Client Name: Pacific Geotechnical Associates Address : 4664 American Avenue Bakersfield, CA 93309 Attention : Mr. Rod Williams Date samples received : 2-13-91 Date analysis completed: 2-20-91 Date of report : 2-20-91 Analytical Chemistry Project Name: South High School Project ~ : SIS003 RESULTS OF ANALYSIS: 690 ID: SB%I-1 BenZene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm MDL,ugm/gm 130. 0.005 140. 0.005 320. 0.005 630. 0.005 770. 0.005 100. 0.005 20. 0.005 11000. 1.0 Method of Analysis for BTX/TPH (Gasoline): 3810/8020 (FID) MDL = Minimum Detection Level TPH = Total Petroleum Hydrocarbons ugm/gm = micrograms Per gram (ppm) ND = None Detected An~ e'l a Horton Analytical Chemist 3155 Pegasus Drive P.O. Box 80835 · · Bakersfield, CA 93308 · (805) 393-3597 Bake~field, CA 93380 · FAX (805) 393-3623 RESULTS OF ANALYSIS: 691 ID: SB#I-2 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm .37 .97 .33 .51 .55 1.3 .50 48. MDL, ugm/~m 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 692 ID: SB~I-3 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm .068 .18 .071 .066 .12 .20 .13 4.6 MDL,ugm/~m 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 693 ID: SB~i-4 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm .090 .34 .13 .22 .26 .62 .24 12. MDL,ugm/gm 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 An~eia Ho~ton Analytical Chemist RESULTS OF ANALYSIS: 694 ID: SB$2-1 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm 100. 120. 80. 170. 340. 390. 83. 7200. MDL,ugm/~m 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 695 ID: SB$2-2 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm .77 1.0 ND 1.4 .66 ND ND 18. MDL, ugm/gm 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 696 ID: SB$2-3 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xylene Isopropylbenzene TPH (Gasoline) ugm/gm ND ND .0054 .0066 .0069 .0079 .011 ND MDL,ugm/gm 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 Ate'la Horton Analytical ChemiSt RESULTS OF ANALYSIS: $.697 ID: SB$2-4 Benzene Toluene Ethylbenzene p-Xylene m-Xylene o-Xy!ene Isopropylbenzene TPH (Gasoline) ugm/gm 18. 27. 27. 62. 56. 14. 4.3 1100. MDL, ugm/~m 0.005 0.005 0.005 0.005 0.005 0.005 0.005 1.0 A~3e 1 a Horton Analytical Chemist LABORATORIES, INC -''' ' ~ J. EGUN, REG. CHEM. 4100 ATLAS CT., BAKERSFIELD, CAUFORNIA':93308'~PHONE(805)~327a1911~ FAX-(805).327-1918 Petroleum Hydrocarbons, PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.= STEVE L. 324-7768 Date of Report= 08/02/91 Lab ~= 8387-1 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT= SBiA @ 25.0 - 25.5' (SOIL) 7/23/91 @ 0944 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil · Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ~II~AL ANALI~I~ LABORATORIES, INC. J. J. EGUN, REG. CHEM. ENGR. 4100'ATLAS CT., BAKERSFIELD, CALIFORNIA 93308' PHONE (805)~327-49'11 FAX (805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab #: 8387-2 Sample Description: ~SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SBIB @ 30.0 - 30.5' (SOIL) 7/23/91 @ 1003 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene 'Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ENVItK~MENTAL C~ ANALYSIS LABORATORIES', J. J. EGUN, REG. CHEM. ENGR. 4100 ATLAS CT., BAKERSFIELD, CAUFORNIA;93308i:PHONE~(805)i32Z.;4911 FAX4805)32?-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE $2 BAKERSFIELD, CA 93309 'Attn.; STEVE L. 324-7768 Date of Report= 08/02/91 Lab ~: 8387-3 Sample Description: ~SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SBlC@ 33.0 - 33.5' (SOIL) 7/23/91 @ 1027 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor LABORATORIES,. INC. J. J. EGLIN, REG. CHEM. ENGR. 4100 ATLAS CT., BAKERSFIELD, CAUFORNIA 93308 PHONE (805)~327-4911 FAX (805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.= STEVE L. 324-7768 Date of Report= 08/02/91 Lab ~= 8387-4 Sample Description: $SIS 002 - SOUTH HIGH scHooL KERN HIGH SCHooL DISTRICT: SB2A @ 25.5 - 26.0' (SOIL) 7/23/91 @ 1327 SAMPLE COLLECTED BY SHL/TRN TEST METHOD= TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed= 08-01-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. ~1186 Department Supervisor PETROLEU¥ LABORATORIFF;_, IN.C: -" J. J. EGLIH, REG. CHEM. ENGRo 4100'ATLAS CT., BAKERSFIELD, CALIFORNIA93308;PHONE(805)~327:4911~FAX~(805)' 327.1918 Petroleum Hydrocarbons.. PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab ~: 8387-5 Sample Description: $SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT= SB2B @ 30.5 - 31.0' (SOIL) 7/23/91 @ 1335 SAMPLE COLLECTED BY S~L/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 Comments: California D.O.H.S. Cert. #1186 Department Supervisor LABO RATO RI F.?,, INC. J. J. EGLIN, REG. CHEM. ENGR. 4100 ATLAS CT., BAKERSFIELD, CALIFORNIA 93308 PHONE (805)~':~27'-4911 FAX(805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab ~: 8387-6 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT= SB2C @ 35.5 - 36.0' (SOIL) 7/23/91 @ 1345 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor C'"~It'[C I./. PETROLEU¥ LABORATORIES, IN.C!'!' J. J. EGUN, REG. CHEM. ENGR. 4100 ATLAS CT., BAKERSFIELD, CAUFORNIA-g~'~---'PHONE~(805)~r7";4911~ FAX-(~')'327~1918 Petroleum Hydrocarbons" PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/05/91 Lab #: 8387-7 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICTs SB3A @ 5.0 - 5.5' (SOIL) 7/23/91 @ 1109 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by.D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 .Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units Minimum Reporting Level Benzene 3.0 mg/kg 2. Toluene 50. mg/kg 2. Ethyl Benzene 46. mg/kg 2. o-Xylene 300. mg/kg 2. m-Xylene 340. mg/kg 2. p-Xylene 140. mg/kg 2. Total Petroleum Hydrocarbons (gas) 5000. mg/kg 600. Comments: California D.O.H.S. Cert. ~1186 Department Supervisor W~AL LABO RATO RIFS, INO. J. J. EGUN, REG. CHEM. ENGR. 4100 ATLAS CT., BAKERSFIELD, CAUFORNIA g3308'PHONE(805)~32'~'4911 FAX (805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.= STEVE L. 324-7768 Date of Report= 08/02/91 Lab #= 8387-8 Sample Description: ~SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3B @ 10.0 - 10.5' (SOIL) 7/23/91 @ 1123 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constStuents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected= 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ANALYSIS PETROLEU¥ LABO RATO RIF , I'NC ' J. J. EGLIN, REG. CHEM. ENGR. 4100 ATLAS .CT., BAKERSFIELD, CAUFORNIA~ _g~_~___',PHONE(805)~327,~4911:FAX4805)327'1916 Petroleum Hydrocarbons. PACIFIC GEOTEC~NICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/02/91 Lab ~t 8387-9 Sample Description: ~SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3C @ 15.0 - 15.5' (SOIL) 7/23/91 @ 1130 SAMPLE COLLECTED BY SHL/TRN TEST M~THOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07123191 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-01-91 Minimum Analysis Reporting Reporting Results Units Level None Detected mg/kg 0.005 None Detected mg/kg 0.005 None Detected mg/kg 0.005 None Detected mg/kg 0.005 None Detected mg/kg 0.005 None Detected mg/kg 0.005 None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor LABORATORIES, INC. J. J. EGUN, REG. CHEM. ENGR. 4100 ATLAS CT., BAKERSFIELD, CAUFORNIA*93308 PHONE (805).3;27'"1911' FAX*(805) 327-1918. Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/05/91 Lab #= 8387-10 Sample Description: ~SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT= SB3D @ 19.5 - 20.0' (SOIL) 7/23/91 @ 1139 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. ~1186 Department Supervisor LABORATORIES', INC' ,J. J. EGUN, REG. CHEM. ENGR, 4100 ATLAS CT., BAKERSFIELD, CALIFORNIA;' _9'~___'PHONE(805)~327a1911' FAX (805) 327-1918 Petroleum Hydrocarbon~ PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE #2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report= 08/05/91 Lab #= 8387-11 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT= SB3E @ 24.5 - 25.0' (SOIL) 7/23/91 @ 1147 SAMPLE COLLECTED BY S~L/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Con st ituent s Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units Minimum Reporting Level Benzene None Detected mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor ANALYSIS PETROLEU¥ LABORATORIES, INC J. J. EGLIN, REG. CHEM~ ENGR. 4100 ATLAS CT.,' BAKERSFIELD, CALIFORNIA 93308 PHONE (805)327'~4911 FAX'(805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200 EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 Date of Report: 08/05/91 Lab $: 8387-12 Sample Description: ~SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3F @ 29.5 - 30.0' (SOIL) 7/23/91 @ 1158 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Minimum Analysis Reporting Reporting Results Units Level None Detected mg/kg 0.005 None Detected mg/kg 0.005 None .Detected mg/kg 0.005 None Detected mg/kg 0.005 None Detected mg/kg 0.005 None Detected mg/kg 0.005 None Detected mg/kg 1. .Comments: California D.O.H.S. Cert. #1186 Department Supervisor ENVIROR~ENTAL Ct~IICAL ANALI~I~ PETFIOLEU¥ LABORATORIES, INC.. J. J. EGUN, REG. CHEM. ENGR. 4100 ATLAS CT., BAKERSFIELD, CALIFORNIAgS308'PHONE(805)~S2'/'~4911~'FAX(805)'327-1918 Petroleum Hydrocarbons" PACIFIC GEOTECHNICAL ASSOCIATES, 4200 EASTON DRIVE SUITE $2 BAKERSFIELD, CA 93309 Attn.: STEVE L. 324-7768 INC. Date of Report: 08/05/91 Lab 2: 8387-13 Sample Description: #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICTs SB3G @ 34.5 - 35.0' (SOIL) 7/23/91 @ 1214 SAMPLE COLLECTED BY S~L/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Benzene Toluene Ethyl Benzene o-Xylene m-Xylene p-Xylene Total Petroleum Hydrocarbons (gas) Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg None Detected mg/kg Minimum Reporting Level 0.005 0.005 0.005 0.005 0.005 0.005 1. Comments: California D.O.H.S. Cert. ~1186 Department Supervisor LABORATORIES, INC. J. J. EGUN, REG. CHEM. ENGR. 4100 ATLAS CT., BAKERSFIELD, CALIFORNIA 93308 PHONE (805)' 327.4911 FAX(805) 327-1918 Petroleum Hydrocarbons PACIFIC GEOTECHNICAL ASSOCIATES, INC. 4200EASTON DRIVE SUITE ~2 BAKERSFIELD, CA 93309 Attn.: STEVE L, 324-7768 Date of Report: 08/05/91 Lab #: 8387-14 Sample Description: ' #SIS 002 - SOUTH HIGH SCHOOL KERN HIGH SCHOOL DISTRICT: SB3H @ 39.5 - 40.0' (SOIL) 7/23/91 @ 1226 SAMPLE COLLECTED BY SHL/TRN TEST METHOD: TPH by D.O.H.S. / L.U.F.T. Manual Method - Modified EPA 8015 Individual constituents by EPA Method 5030/8020. Sample Matrix: Soil Date Sample Collected: 07/23/91 Constituents Date Sample Received @ Lab: 07/23/91 Date Analysis Completed: 08-02-91 Analysis Reporting Results Units Minimum Repor~ing Level Benzene None Detec=ed mg/kg 0.005 Toluene None Detected mg/kg 0.005 Ethyl Benzene None Detected mg/kg 0.005 o-Xylene None Detected mg/kg 0.005 m-Xylene None Detected mg/kg 0.005 p-Xylene None Detected mg/kg 0.005 Total Petroleum Hydrocarbons (gas) None Detected mg/kg 1. Comments: California D.O.H.S. Cert. #1186 Department Supervisor South High Schoo~ite Characterization Chain of Custody Documents PACIFIC GEOTECHNICAL ASSOCIATES, INC. ~~- f CHAIN OF CUSTODY RECORD Pacific Geotechnical Associates, Inc. ! 4664 Amedcan Avenue · Bakersfield, Calif. 93,309 · (805) 832-7490 ~ / of,,/ ~~ ~- CHAIN OF CUSTODY RECORD Pacific Geotechnical Associates, Inc. 4664 American Avenue · Bakersfield, Calif. 93309 · (805) 832-7490 Pagei of~- ~~ ~ CHAIN OF CUSTODY RECORD '~ Pacific Geotechnical Associates, Inc. .- ! 4664 American Avenue · Bakersfield, Calif. 93309 * (805) 832-7490 Page ~' of ~ APPENDIX B I.RTIER FROM KCEHSD TO KERN HIGH SCHOOL DISTRICT APPROVING SOIL VENTING KEMEDIATION OPTION Pacific Geotechnical Associates, Inc. ~s~¢ ! RANDALL L. ABBO'I-F DIRECTOR DAVID PRICE ili ASSISTANT DIRECTOR STEVE McCALLEY, REHS~.DIRECTOR Air Pollution Control District WILUAM J. RODDY, APCO Planni~ & Dev~iopmem Sewices Deparm~ent TED ,JAMES, AICP, DIRECTOR ENVIRONMENTAL HEALTH SERVICES DEPARTMENT October 17, 1991 Kern High School District 2000 24th Street Bakersfield, CA 93301 Attention: Ms. Janet Ford-Shell RE: South High School 1101 Planz Road, Bakersfield, CA Permit: 310009 Ladies and Gentlemen: The Site Characterization Report submitted by Pacific Geotechnical Associates (PGA) for the above-referenced facility has been reviewed. The major portion of the contamination lies in an area of approximately 10 feet thickness, beneath the ground surface, with some migration beneath the maintenance building. PGA has suggested the following remediation options: 1. o No Action: Denied. Levels of T.P.H. and benzene exceed levels that may be left in place. Portions of the plume have migrated beneath' the structure, which may become upwardly mobile and increase risk factors. Soil Venting/Carbon Adsorption: Agreeable to this Department. May require permitting by Kern County Air Pollution Control District. Vapor Extraction: Acceptable to this Department. This technique is rapid and would minimize the amount of time the equipment would be onsite. It requires permitting by Kern County Air Pollution Control District. Excavate: Acceptable to our Department but may not be feasible due to proximity of buildings.. 2700 "M" STREET, SUITE 300 BAKERSFIELD, CALIFORNIA 93301 (805) 861-3636 FAX: (805) 861-3429 Kern High School District October i7, 1991 Page 2 A site remediation workplan must be submitted to this office for review. Remediation efforts should commence within 60 days of the above date. If you have any questions or desire further information, contact me at (805) 861-3636, Extension 549. FD:cas . Sincerely, /'7 _ ./f _//~ , Hazardous Materials Specialj~ Hazardous Materials Management Program cc: Pacific Geotechnical Associates '~3 lO009.1tr APPENDIX C SOIL VENTING/CARBON ABSORP'rlON TREATMENT SYSTEM LITERATURE Pacific Geotechnlcal Associates, Inc. page 1 .............. 1 N3fl-I:INI ~131d1103 3~VI/V33 ,,g V"IO$1 NOIl V,~8IA l~tOd Q3ZI18 ~IV HS3~t3 FIN ONINI ONI~IOV8 -- '~IV~I ONII NnOrV ~t3ldVOV 3"IVIAI ,,Z 3onvo l, vnnovA ~J31~13 150d IN3H373 ~J31-113 QNV ~31SINV3 S1~830/15nQ ~I0101AI _'lOO&td NOISO ldX3 - ~3~S,~S ~vnnovA 'llNf) _-!0 3Q15 MOV8 NO Q3.LVOO'7 O~OO ~13MOd :~. X08 HD./.I~$ *3iON* PERFORMANCE. CURVES, 1 HP, VACUUM SYSTEM 60 50 40 .30 2o 0 0 20 40 60 801 100 FREE AIR FLOW (CFM)I PERFORMANCE CURVE, 2 HP, tVACUUM SYSTEM 100 IIIIIII1111111111111111111t111111111 IIIIIIIIIIIIIIIIIIit1111111111111111 IIIIIIIIIIIIIIIIIlllllllllllllllllll kl4N, IJlllllllllllllllllllllllllllll 80 I I~NIIIIIIIIIIIIIIIIIIIIllllll Il I ~lllllllllllllllllllllll H-t-I~I.LIIIIIll"I. LIIIIIIIIIIlll I II IlllllIPl'l,~llll'~llllllllllllllllll 60 IIIIIIIIIll'N, tIII I~IIIIIIIIIIIIIIIll Illlllllllllll~llll~llllllllllllllll IIIIIIIIIIIIIIINIIII~IIIIIIIIIIIIIll 40 Illllllltlllllll. I klll~lllllllllllll IIIIIIItIIIIIIIIIINIIN Illlllllllll IIIIIIIIIIIIIIIIIIPLll NIIIIIIIIlll Illlllllllllllllllll'kll NIIIIIIIIll IIIIIIIIIIIIIIIIIIIIIINI~IIIIIIIII 20 Illlllllllllllllllllllll~ll~llllllll IIIIIIIIItIIIIIIIIIIIIIIINI~IIIIIll I 'IIIltIIIIIIIIIIIIIIIIN, I N~IIIll Illllllllllllltlllllllllllll'kll'kllll 0 ~ O' 26 50 75 ~00 ~25 ?50 776 FREE AIR FLOW .......... IN TERMI TTEN T PRESSURE - VACUUM APR. ETON BUSINCn~$ CD/TER NL'W IPSWICH, NEW ~ ~71 ~ (~) 8~2624 PERFORMANCE.: CUR VES, 1 HP & 2 HP VACUUM S~MS DWG. NO.' 105 AVENIDA:~DE~LA: ESTRELLA 6U Ni.,AC. INC, ' '" · . SAN~C~MENTE.~CALIF. 92672 (714)' 498~83~;,~-'' .. ENVIRONMENTAL PRODUCTS & SERVICES · FAX ,~,.'~(71a,) TELEX EIUN'A(2, 4 x 6 MESH PELLET DESCRIPTION: These act/rated carbon pellet, are un/form adsorbent with well developed nmoropora ~uld mioropore structure allowing a wide range of unllormily of particle gte dla~rbutlon. The high lmrdn®u number allows for minimal I~makage and &he Idndllng poln~ of ~ r, erbon is unum~ly hlglt :! ' ~; ' ' This ;arbon Is designed to provide an efficient, eeonomlo, i way to control vapors venMd from: storage tanks, reactor vesseiw, prooelw aqulpmanf, lewage Ire~tmaM p/a/g, fo name · few eppll~tJon& ,, camon will effecth(ely remove odom, toxin v~pora, irritlntl, and ~ l~mse~ mmmg few Of the ga;las ~uld vapor~ ghat ~ be commlled utilizing this carben me: PHYSICAL PROPERTIES: CARBON TETR~CHLORIDE ACTIVITY APPARENT DENSITY, LBS./CUBIC FOOT TOTAL ~ CONTENT ~NE.SS (Bali Abrasion) IODINE NUMBER e5 Minimum 8?5 ,., · ,.._~.: ~..~_{~*..~ ~ 42½"- ~ 112" ~ 20~m Bolted ~ }lanway COUPLINGS 4" X 8" Steel 3/16' Top & Bottom D?f DRAIN PLUG ,\ 2~11 .... .: ~ .: SUN:AG, Inc. 105 Avenida De La Bstrella, Ste. 3C San Clemenbe Ca 92, MODEL SA2000V .~j~~ SUITE":'3 ~L~'~ -:... ~..~. :~ " " ~ ~4) 498~4'.-: ENVl~NMENTAL PRODUCTS & SERVICES ~AX ~(~4) 498-38~7 TELEX ~ 681888' 11 10 8 100 200 300 #00 500 UNIT FLOW RATE, CFM SUN-AG Model 2000V Vapor Phase Adsorber ' /"WII. LIAM~ A. TEIPE &~ &O¢IATE., INC:. -- C,~QidlBU L. rl N ~. ~ iVi L~ KNGINIrERS WI'LL. IAM~A. ~TEIPE'~ &~;A~S$OCIATE$, ! NC. CQNSUI. TtNG CIVIL, ENI~INEERS IUIJECT I C~)NIULTIN6-CIVIC. i[NQINE:~rR~ - ...j