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Home My WebLink AboutMITIGATION 10/29/1993 ~''''~ - TWlIIIII'- ,¡; LABORATORIES, INC. ANALYTICAL CHEMISTRY' ENVIRONMENTAL SERVICES GEOTECHNICAL ENGINEERING . DRilLING SERVICES CONSTRUCTION INSPECTION & MATERIALS TESTING LIMITED SOIL ASSESSMENT WORK PLAN FOR A CLASS V SHALLOW INJEcrION WELL PACIFIC GAS AND ELECfRlC COMPANY SERVICE CENTER 4101 WIBLE ROAD BAKERSFIELD, CALIFORNIA Prepared Cor: Pacific Gas and Electric Company Kern Division 1918 H Street Bakersfield, CaliCornia 93301 Prepared by: The Twining Laboratories, Inc. 2527 Fresno Street Fresno, CaliCornia 93721 October 29, 1993 TL 393-0161-02 CORPORATE OFFICE: 2527 Fresno Street Fresno, CA 93721 (209) 268-7021 . Fax 268-7126 (\L....._:........ r.... I',,:on n'7An MODESTO 4230 Kiernan Ave. Suite 105 Modesto, CA 95356 (209) 545-1050 r..... ~Ar: .... A-' VISALlA 2521 E. Valley Oaks Drive Visalia, CA 93292 (209) 625-1712 .r:....'" C"IC "'7" A BAKERSFIELD 3701 Pegasus Drive, Suite 124 Bakersfield, CA 93308 (805) 393-5088 c....v I)nl) AC AI) - -- TL 393~0161-02 TABLE OF CONTENTS ~ 1.0 WIRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 2.0 PURPOSE AND SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 3.0 BACKGROUND INFORMATION.. . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. 1 3.1 Site Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 3.2 Regional Geology ........................................ 2 3.3 Regional Hydrology. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 3.4 Project History .......................................... 2 4.0 WORK SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 4.1 Site Health and Safety Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 4.2 Soil Borings and Soil Sampling .............................. 5 4.3 Laboratory Analyses ...................................... 5 4.4 Site Characterization Report ................................. 6 5.0 PROJECT SCHEDULE ........................................ 6 6.0 UMITATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 7.0 CWSING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 ii TL 393-0161-02 LIST OF TABLES Table 1 Table 2 e e TABLE OF CONTENTS (Continued) Summary of Analytical Methods and Results, Liquid Sample . Date Sampleù: August 5, 1993 Summary of Analytical Methods and Results, Sludge Sample LIST OF APPENDICES APPENDIX A The Twining Laboratories, Inc. Standard Operating Procedures iii e e LIMITED SOIL ASSESSMENT WORK PLAN FOR A CLASS V SHALLOW IN.JEcrION WELL PACIFIC GAS AND ELECfRIC COMPANY SERVICE CENTER 4101 WIBLE ROAD. BAKERSFIELD. CALIFORNIA 1.0 INTRODUcrION This work plan is for a limited soil assessment in the area of a Class V shallow injection well at the Pacific Gas and Electric Company (PG&E) Bakersfield Service Center at 4101 Wible Road, in Bakersfield, California (Drawing 1). This work plan was authorized by Mr. Tom O'Brien of PG&E. The work plan was prepared by the Environmental Services Division of The Twining Laboratories, Inc. (Twining), in Visalia, California. 2.0 PURPOSE AND SCOPE . The pUrpose of this site characterization is to assess the presence of petroleum hydrocarbons in soil that may have resulted from the use of the Class V Shallow Injection Well associated with the vehicle wash rack. Twining's proposed scope of work is summarized below. · Drill and sample a soil boring next to one of three drywells that received rinseate from the wash rack; · Collect soil samples from the boring at approximately 5-foot intervals and field screen the samples for the presence of petroleum hydrocarbons; · Analyze selected soil samples for total petroleum hydrocarbons-diesel (TPH- D); and · Prepare a technical report for submittal to the Kern County Environmental Health Services Department (KCEHSD). 3.0 BACKGROUND INFORMATION , A description of the site and project history are presented in the following subsections. . ! I i i ~- i - I ............,,,....,,.....,,, .37Q I).":;) V'," ~'1'/ ú~,.,i ~):~:;Ä~'~: ...... :..... --_._-.._-~_. -.--...---- ::::::{::::::. h ~~ ~~. ...·.~i~..... c~ _--:Y~)HAR-:I~ ;/1 _.;:C';~~.' ."':-"1 ·11. 'I ,----:;;"-~~ l:1 <~'U__,]J--~J~--- I~ò R.Qi~ dreeñfì¡.Jd . III. J Jr High >';ch . I 1 ) ----~v f ' I I , '; ,. ~ '''-.)'>0 ~'; / /' ./ ----......,....., Fairview Sch . (Aoon'd) L, FAIRVŒW 3~ 19 366 PANAMA :\\ i' . .'\ &s~ __3, ROAD RO Tr~~;~ l~L~ r i~ ,",{<' 1¡ - '. /I/tr' ":, LANE .. NORTH SITE LOCATION MAP PACIFIC GAS AND ELECTRIC BAKERSFIELD SERVICE CENTER 1918 H STREET BAKERSAELD. CALIFORNIA o 2000 I I I APPROXIMATE SCALE (fEET) SCALE: DATE: 1n=2000' 10/29/93 DRAWN BY: WP PROJECT NO. 393-0161-02 APPROVED BY: ... The Twining ... Laboratories, Inc. FRESNO/MODESTONISALIA/BAKERSFIELD DRAWING NO, 1 e e Pacific Gas and Electric Company October 29, 1993 TL 393-0161-02 Page 2 3.1 Site Descrintion: The site is located at 4101 Wible Road, in Bakersfield, California. The site is in the southeast quarter of Section 14, Township 30 south, Range 27E, Mount Diablo Baseline and Meridian. The site is at an approximate elevation of 370 feet above mean sea level and is currently occupied by the PG&E Bakersfield Service Center. PG&E operates a vehicle màintenance facility at the site. A wash rack is located on the eastern edge of the vehicle maintenance building. Prior to 1993, rinseate from the wash rack was collected in a drain and then piped through an oil/water separator into three drywells. The drywells are reportedly 10 to 15 feet deep. Drawing 2 is a site plan and schematic of the rinseate disposal system. In 1993, PG&E installed a closed rinseate recovery system that collects rinseate for recycling. Piping to the drywells was disconnected. 3.2 Re~onal Geolo~: The site is in the southern portion of the San Joaquin Valley, within the southern half of the Great Valley geomorphic province of California. The Great Valley is a nearly flat, north-west to south-east trending structural basin approximately 450 miles long and 50 miles wide. The Great Valley extends from the granitic and metamorphic Sierra Nevada on the east to the sedimentary and metamorphic Coast Range Mountains to the west. The Great Valley is bound on the north by the Klamath Mountains and on the south by the Transverse Ranges. The Great Valley has been filled with a sequence of older to younger alluvium of Pliocene to Holocene age that overlie sedimentary rocks of Cretaceous to Tertiary age (Hackel, 1966). 3.3 Re~onal HydroloK,y: Groundwater in the Bakersfield area is present mainly in the unconsolidated sediments of Pliocene and younger. According to the United States Department of the Interior, Bureau of Reclamation, groundwater in the area of the site was approximately 190 feet below surface grade in the Spring of 1992 and flowed generally to the east (U.S. Bureau of Reclamation, 1992). 3.4 Proiect History: In April, 1993, the KCEHSD requested that PG&E perform a preliminary investigation of the former rinseate disposal system with the goal of closure of the system according to United States Environmental Protection Agency ,(U.S. EPA) guidelines. PG&E retained Twining to perform initial sampling and analysis of liquid and sludge remaining in the former disposal system. On August 5, 1993, Twining sampled liquid and sludge from the oil/water separator on site. The samples were collected in the presence of a KCEHSD representative. Analytical results of the samples are summarized on tables 1 and 2. The number and location of the samples and the specific analyses were requested by the KCEHSD. - WHITE LANE ~ . , Fence -,. Vehicle Maintenance Garage Oil/Water Separator 0 / ¡ 0- -fT & - -0<:>-0- - - - - - - -0-' \ Oiverter Ji Collection Drain -0 . Fence ~ NORTH 0 40 I I Scale in Feet EXPLANATION o Drywall . Proposed Boring Location SrTEMAP SCALE: DATE: 1 "=40' 10/29/93 . The Twining Former Wash Rack DRAWN BY: APPROVED BY: Rinseate Disposal System wp Laboratories, Inc. Pacific Gas and Electric PROJECT NO. DRAWING NO. Bakersfield Service Center 393-0161-02 2. FRESNO/MODESTONISAlIA/BAKERSFtELD e e, Pacific Gas and Electric Company October 29, 1993 TL 393-0161-02 Page 3 TABLE 1 SUMMARY OF ANALYTICAL METIIODS AND RESULTS Liquid Sample Date Sampled: AUfUst 5, 1993 ::R£iMiW¿61 ............,............ ......................... """""''' ............ . " "I" d' .. ..... ..I.... . ...... .. ..... "'::"':',I:,:,::Mtiþ" I.. ........ . . . . . - M~ij\~t# uhiU( ::\¢ß#¢a#i~i,ß~ Volatile Aromatics 601(1) 602(1) ug/L ug/L ND* 0.5-3.0 Volatile Haloc:arbons Toluene Xylenes 1.7 0.5 0.6 0.5 GCfFID(2) ug/L ND 40 801S ug/L ND 0.5 8015 ug/L ND 0.5 GC-FID ug/L 1040 1-- 80 f~2S , 418.1 mg/L / ) \0 10 1 - -' TPH-G Methyl ethyl Ketone Methyl isobutyl Ketone TPH-D TRPH ·ND = None detected MDL = Method detection limit. Individual MDLs are listed on laboratory data reports. (1) United States Environmental Protection Agency, 1987, "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods: SW-846, 3rd cd. (2) California State Water Resources Control Board, 1989, Leaking Underground Fuel Tank Field Manual (LUFf). e e Pacific Gas and Electric Company October 29, 1993 TL 393-0161-02 Page 4 TABLE 2 SUMMARY OF ANALYTICAL METHODS AND RESULTS SIud2e Samole ....................... ..................... ..................... ... ........................ iJ~=~IIII: Poly-chlorinated Biphenyl (PŒ) 8080 mg/kg ND· 1.0 Antimony 7041 mg¡'L mg¡'L mg¡'L mg¡'L mg¡'L mg¡'L mg¡'L mg¡'L mg¡'L mg¡'L mg¡'L mg¡'L mg/I mg¡'L mg¡'L mg¡'L mg¡'L 0.008 0.005 Arsenic 7060 0.054 u. ~' 0.002 Barium 6010 1.27 0.005 Beryllium 6010 0.002 0.001 Cadmium 6010 0.03 V -,' 0.01 Chromium 6010 0.16 0.01 Cobalt 6010 0.06 0.05 Copper Lead 6010 0.37 0.05 7420 0.33 I '.:"~ '--" ) 0.05 Mercury 7470 ND· 0.0002 Molybdenum 6010 ND 0.2 Nickel 6010 0.14 0.05 0.003 Selenium Silver 7741 7760 0.009 ND 0.02 0.005 Thallium 7841 ND Vanadium 6010 0.23 0.05 Zinc 6010 1.32 0.05 ·ND None detected MDL Method detection limit (1) United States Environmental Protection Agency, 1987, "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods· SW-846, 3rd cd. Based on these analytical results the KCEHSD requested in a letter dated October 1, 1993, that PG&E submit a site characterization workplan for assessing the soil surrounding the shallow injection well system. In the letter, and in a later phone conversation with Twining staff, the KCEHSD has specified only assessment of the TPH-D in the soil. - e Pacific Gas and Electric Company October 29, 1993 TL 393-0161-02 Page 5 4.0 WORK SCOPE Twining developed the following work scope to assess the presence of TPH in soil in the area near the drywells. The scope of work is based on the requirements included in KCEHSD publications "Closure of Shallow Disposal Wells", (SDW-I00) and "Site Characterization and Remediation," (Handbook UT-35) and on Twining's experience in projects of this type. Because each of the drywells received rinse ate, PG&E proposes to drill only near one of the drywells. IT indications of TPH are observed in soil, PG&E will propose additional drilling to assess the extent in soil. This work is designed to be exploratory in nature and is not intended to be a complete site characterization. Our work scope will be performed under the direction of a California registered geologist. Field activities will be performed according to Twining's standard operating procedures, which are presented in Appendix A 4.1 Site Health and Safety Plan: Twining has prepared a health and safety plan which will be available to field personnel. The health and safety plan is presented in Appendix B. 4.2 Soil Borin~s and Soil Sampline: Twining will drill and sample the soil boring utilizing a truck-mounted hollow-stem auger drilling rig near the center drywell. This drywell should be representative of the other two. The boring will be drilled and sampled to at least 20 feet below surface grade (BSG). This depth is based on the reported depth of the drywells of 10 to 15 feet BSG. Soil samples will be collected at approximately 5-foot intervals for the preparation of lithologic logs. Samples will also be collected 1 to 2 feet and 5 feet below the bottom of each drywell according to the figure C-2 of the SDW-lOO. The soil samples will be field screened for the presence of petroleum hydrocarbons with a photoionization detector (Pill) and observed for staining or odor. Drilling will continue until a sample can be collected 5 feet below the last field evidence of petroleum hydrocarbons in soil. Soil cuttings from drilling and rinseate from decontamination procedures will be containerized in Department of Transportation approved, sealed, 55-gallon steel drums in an area of limited public access. Disposal will be based on the analytical results of samples collected during drilling. . 4.3 Laboratory Analyses: Selected soil samples will be analyzed for TPH-D by U.S. EPA method 3540 and gas chromatography-flame ionization (GC-FID). Samples analyzed will include samples 1 to 2 feet and 5 feet below the bottom of the collection 4!ain, oil/water separator, diversion sumy and e~ of the d~el~. Samples from every 5 feet in the borings will alsooeãïïãlyzed for TPH-D. e e Pacific Gas and Electric Company October 29, 1993 TL 393-0161-02 Page 6 The soil samples will be analyzed by Twining, a California Department of Health Services- certified laboratory. I I 4.4 Site Characterization Report: Twining will prepare a limited soil assessment report which will include at least the following: · Brief Discussion of the Problem; · Soil assessment findings; and · Conclusions and Recommendations. 5.0 PRO.JECf SCHEDULE The field portion of this project will begin after KCEHSD approval of this workplan and appropriate permits are obtained from the KCEHSD. The drilling should be completed in two days. Laboratory analytical results should be available two weeks after the completion of the field work. The limited soil assessment report will be completed within sixty days of the completion of the field portion of the project. 6.0 LIMITATIONS This workplan is based on the assumption that site conditions do not deviate from those reported to Twining. If variations are found, or undesirable conditions exist, Twining should be notified so that supplemental consideration may be provided. Work performed by Twining will be for the sole use of the client and appropriate regulatory agencies. Any reliance on Twining's work by a third party will be at that party's sole risk. Geologic and hydrologic conditions may exist at he site that cannot by identified solely by visual observation. When subsurface assessment is performed, professional opinions are based on interpretation of data at discrete sampling locations which may not represent conditions at unsampled locations. Twining is unable to predict events that may change the site conditions after its professional services are performed. Therefore, Twining assumes no responsibility for conditions it was not authorized to evaluate, or conditions it was not generally recognized as predictable when services were performed. e e Pacific Gas and Electric Company October 29, 1993 TL 393-0161-02 Page 7 Professional services performed by Twining will be in accordance with generally-accepted engineering principles and practices in Kern County in 1993. This warranty is in lieu of all other warranties, either expressed or implied. 7.0 CLOSING Twining appreciates being of service to PG&E on this project. If you have any questions concerning this work plan or any aspect of the project, please call Twining at (209) 625- 1712. Respectfully submitted, THE lWINING LABORATORIES, INC. Environmental Services Division I!U~ Project Manager lðt~~g~EG Division Manager " WP:CLR:lr e I - TL 393-0161-02 APPENDIX A THE lWINING LABORATORIES. INC. STANDARD OPERATING PROCEDURES e e STANDARD OPERATING PROCEDURES FOR DRILLING AND SOIL SAMPLING Standard operating procedures (SOPs) used by The Twining Laboratories, Inc. (Twining) when drilling soil borings, and sampling soil are presented below. Twining observes these procedures in order to obtain consistent, reliable data. I ! Subsurface assessment permits will be filed with the appropriate regulatory ageIlcies prior to conducting field operaûons. Field acûvities will be performed under the direcûon of a California-registered geologist. ~ Soil borings will be drilled using an appropriate method. The method selected will depend upon project objectives and subsurface conditions. Drilling and sampling equipment will be thorougWy cleaned before, during and after each use. Cleaning procedures are described in Twining's "Standard Operating Procedures for Equipment Decontamination". Soil samples will be collected using a continuous-coring device, by driving a split-spoon sampler, or by grabbing samples from the drilling cutting returns. The sampler or coring device will be lined with brass, stainless steel, or acrylic tubes, in which samples may be retained for subsequent chemical analyses. Soil samples will be examined for the purpose of preparing lithologic logs, and screened for evidence of volatile organic chemicals (VOCS) using a photoionizaûon detector (Pill) or Drager tube. If a Pill is used, it will be calibrated daily according to manufacturer's recommendations. Screening for VOCS is performed by placing samples in sealed glass containers, and placing the containers in a warm atmosphere for approximately 15 minutes to allow volatiles to escape from the soil. The PID probe or tip of the Drager tube is inserted into the container to measure VOC concentration in the sample head-space. The greatest concentraûon of organic vapors or the drager tube reading will be recorded on the soil boring log. Generally, two soil samples from each soil boring will be submitted for chemical analyses. Soil samples selected for analyses typically represent the greatest head-space analysis reading recorded for each soil boring, and the sample from just above first-encountered groundwater. Samples intended for chemical analyses will be sealed with Teflon tape and plastic end caps, labeled, placed on ice, and delivered to a laboratory, along with chain-of- custody 'documentation. e e To collect samples using the split-spoon sampler, the sampler is initially lowered to the bottom of the soil boring and driven 6 inches into undisturbed soil. It is then driven 12 inches deeper by repeatedly dropping a 140-pound weight from a height of 30 inches. The number of blows required to advance the sampler 12 inches is recorded on the boring logs as "blows per foot". This information is used in estimating soil density. Soil descriptions, including consistency, moisture, particle size, and color, and other relevant observations will be recorded on soil boring logs. Soils will be classified in general accordance with the Unified Soil Classification System (USCS) or the American Society for Testing and Materials (ASTM) standards. The soil borings may be completed as groundwater monitoring wells, or abandoned by grouting with a 6-sack cement slurry containing 3 to 5 percent bentonite or by backfilling with bentonite chips. Abandonment procedures will depend upon the boring depth, depth to groundwater, project objectives, and regulatory requirements. For borings greater than 15 feet deep, grout will be emplaced through the hollow augers which will extend to within 15 feet of the bottom of the boring. If required by the local regulatory agency, grout will be emplaced by pumping through a tremie pipe which extends to within 15 feet of the bottom of the boring. The tremie pipe or augers are withdrawn from the boring in 5-foot increments as the boring fills with grout. SOPs for groundwater monitoring well installation are described in a separate document. Soil cuttings generated during drilling will be containerized in Department of Transportation-approved drums, or placed on and covered with plastic sheeting, and stored on site in an area inaccessible to the general public. Typically, the stockpiled soil is characterized by collecting and analyzing composite samples from the stockpile. Twining can recommend an appropriate method for disposition of the cuttings based on the analytical results. Disposal will be the responsibility of the client. e e STANDARD OPERATING PROCEDURES FOR EOUIPMENT DECONTAMINATION Standard operating procedures used by The Twining Laboratories, Inc. (Twining) when decontaminating equipment are described below. Twining observes these procedures in order to obtain consistent, reliable data. Proper decontamination procedures reduce the potential for: (1) cross-contamination among sample locations; and (2) introduction of contamination from outside sources. Before, during, and following drilling operations, drilling equipment will be thoroughly cleaned using a high pressure hot water (steam) washer. Well casing, screen, end caps, and centralizers will also be cleaned using the steam washer. Steam cleaning condensate will be containerized for later disposal. Generally, disposal will be the client's responsibility. Sampling equipment and any tools, measuring devices, or other equipment which will contact soil, groundwater, or any media being assessed will be washed in a non-phosphate soap and water solution, and rinsed in de-ionized water before each use. The type of soap used will depend upon project requirements. ,e e . STANDARD OPERATING PROCEDURES FOR SAMPLE HANDLING AND CHAIN OF CUSTODY Standard operating procedures used by The Twining Laboratories, Inc. (Twining) for sample handling and chain of custody are presented below. Twining follows these procedures in order to obtain consistent, reliable data. Records will be developed for samples which include: sampling date, sample type, location, job number, name of sampling personnel, and method of preservation. Each sample container will be labelled immediately following collection. Chain-of-custody protocol, as described in United States Environmental Protection Agency, 1986, "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, SW-846, 3rd ed.", will be followed. Samples will be maintained at approximately 4°C. Upon arrival at the laboratory, the samples will be preserved for analysis as appropriate. Samples may be delivered to Twining's chemistry laboratory in Fresno, California. The Twining representative in charge of the field work will transport or direct the transportation of the samples and custody forms to the laboratory, where the samples will be transferred to the sample control department. A receiving clerk, or an authorized analyst, will sign the custody forms, present a duplicate copy to the Twining representative, and transfer the samples to a laboratory analyst. The laboratory director will retain possession of the custody forms during analyses of the samples. The laboratory director's responsibilities include monitoring the sample integrity within the laboratory. This involves assigning each sample a laboratory number and maintaining cross- reference between the sample's field and laboratory identifications. The analysts' responsibilities include maintaining accurate records of the samples analyzed along with the analytical data produced. This involves labelling chromatograms and maintaining the laboratory numbers on subsamples taken from the submitted samples, labelling glassware used in the analyses, and properly labelling sample extract containers with each sample's laboratory number. Following analyses, the samples are transferred to a limited-access storage room. Chain-of- custody forms, chromatograms, and other pertinent information are filed for future reference. Splits of samples analyzed are kept for 30 days. Samples containing hazardous concentrations will be returned to the client for disposal. e e STANDARD OPERATING PROCEDURES FOR LABORATORY OUALI1Y ASSURANCE/OUALI1Y CONfROL Standard operating procedures used by The Twining Laboratories, Inc. (Twining) for laboratory quality assurance/quality control (QA/QC) are presented below. Twining observes these procedures in order to obtain consistent, reliable data. These laboratory QA/QC procedures were developed to reduce outside inteñerences during analyses of samples. The laboratory director is responsible for creating and maintaining the program. General QA/QC,procedures follow: o Analytical instruments are serviced on a regular basis to assure accurate calibration; o Organic-free water is monitored daily for quality; o Gas chromatographs are calibrated daily; o Method blanks are run to check whether the glassware and reagents are free of inteñ~rence from chemicals that would invalidate the analyses; o Standards are prepared using the applicable reference materials; o Matrix spikes are analyzed in duplicate to validate the accuracy and precision of the method; and o During groundwater sampling, a travel blank sample consisting of organic-free water is prepared and containerized in the laboratory, transported to the site, and handled and transported in the same manner as the groundwater samples. e e STANDARD OPERATING PROCEDURES FOR SAMPLE HANDLING AND CHAIN OF CUSTODY Standard operating procedures used by The Twining Laboratories, Inc. (Twining) for sample handling and chain of custody are presented below. Twining follows these procedures in order to obtain consistent, reliable data. Records will be developed for samples which include: sampling date, sample type, location, job number, name of sampling personnel, and method of preservation. Each sample container will be labelled immediately following collection. Chain-of-custody protocol, as described in United States Environmental Protection Agency, 1986, 'Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, SW-846, 3rd ed.", will be followed. Samples will be maintained at approximately 4°C. Upon arrival at the laboratory, the samples will be preserved for analysis as appropriate. Samples may be delivered to Twining's chemistry laboratory in Fresno, Calüornia. The Twining representative in charge of the field work will transport or direct the transportation of the samples and custody forms to the laboratory, where the samples will be transferred to the sample control department. A receiving clerk, or an authorized analyst, will sign the custody forms, present a duplicate copy to the Twining representative, and transfer the samples to a laboratory analyst. The laboratory director will retain possession of the custody forms during analyses of the samples. The laboratory director's responsibilities include monitoring the sample integrity within the laboratory. This involves assigning each sample a laboratory number and maintaining cross- reference between the sample's field and laboratory identifications. The analysts' responsibilities include maintaining accurate records of the samples analyzed along with the analytical data produced. This involves labelling chromatograms and maintaining the laboratory numbers on subsamples taken from the submitted samples, labelling glassware used in the analyses, and properly labelling sample extract containers with each sample's laboratory number. Following analyses, the samples are transferred to a limited-access storage room. Chain-of- custody forms, chromatograms, and other pertinent information are filed for future reference. Splits of samples analyzed are kept for 30 days. Samples containing hazardous concentrations will be returned to the client for disposal. e - STANDARD OPERATING PROCEDURES FOR LABORATORY OUALI1Y ASSURANCE/OUALI1Y CONTROL Standard operating procedures used by The Twining Laboratories, Inc. (Twining) for laboratory quality assurance/quality control (QA/QC) are presented below. Twining observes these procedures in order to obtain consistent, reliable data. , 1ñese laboratory QA/QC procedures were developed to reduce outside interferences during analyses of samples. The laboratory àirector is responsible for creating and maintaining the program. General QA/QC procedures follow: . o Analytical instruments are serviced on a regular basis to assure accurate calibration; o Organic-free water is monitored daily for quality; , o Gas chromatographs are calibrated daily; o Method blanks are run to check whether the glassware and reagents are free of interference from chemicals that would invalidate the analyses; o Standards are prepared using the applicable reference materials; o Matrix spikes are analyzed in duplicate to validate the accuracy and precision of the method; and o During groundwater sampling, a travel blank sample consisting of organic-free water is prepared and containerized in the laboratory, transported to the site, and handled and transported in the same manner as the groundwater samples. · - STANDARD OPERATING PROCEDURES FOR DECONTAMINATION RINSATE. MONITORING WELL PURGED WATE~ AND SOIL CU1TINGS DISPOSAL The soil cuttings generated by drilling operations will be retained on site, and either covered by plastic sheeting or containerized in Department of Transportation-approved drums. The drilling equipment will be steam-cleaned on racks, and the rinsate will be retained in a steel trough, and then transferred to drums. Water purged from monitoring wells will be containerized in drums if contamination is known or suspected. Drums containing soil, rinsate, and purged water will be sealed and temporarily stored on site at a location remote to the public. Each drum will be labelled to identify its contents. Disposal of these wastes will be the responsibility of the client. The client will be informed that the wastes must be disposed in accordance with applicable Federal, State, and local regulations. .îW!~~~p ANALYTICAL CHEMISTRY· ENVIRONMENTAL SERVICES GEOTECHNICAL ENGINEERING . DRILLING SERVICES CONSTRUCTION INSPECTION & MATERIALS TESTING DATE 10/29/93 Job No. 393-0161-02 ATTN: Ms. Dolores Gough RE: Class V Shallow Injection Well PG&E Bakersfield Service Center TO Kern County Environmental Health Services Department 2700 M street Bakersfield, California 93301 WE ARE SENDING YOU X Attached 0 Under separate cover via the following items: o Drawings o Copy of letter o Brochures o Specifications o Invoices X Copy of Report o Plans o o S8q)les 1 10/29/93 TL 393-0161-02 Limited Soil Assessment Work Plan for a Class V Shallow Injection Well Pacific Gas and Electric Company Service Center, 4101 Wible Road Bakersfield, Ca THESE ARE TRANSMlITED as checked below: o X o o For approval 0 For your use 0 As requested 0 For review and comment Approved as submi tted Approved as noted Returned for corrections o o o Resubmit copies for approval Submit_____copies for distribution For Signature REMARKS Please call Twinina at (209) 625-1712 if you have any auestions. COPY TO PG&E: Mr. Dennis White ~GNFJ>. ?1~ If enclosures are not as noted, kindly notify us at once· c 2527 Fresno Street, P.O. Box 1472 Fresno, California 93716 (209) 268-7021 Fax (209) 268-7126 \r2521 E. Valley Oaks Drive I'visalia, California 93291 (209) 625-1712 Fax (209) 625-1714 a 4230 Kiernan Avenue, Suite 105 Modesto, California 95356 (209) 545-1050 Fax (209) 545-1147 C 3701 Pegasus Drive, Suite 124 Bakersfield, California 93308 (805) 393-5088 Fax (805) 393-4643 e '~ ',' "-'ì e \. '" 'j ,,-' ~ ~ W tr [):> [):> W I:-' ru I.r1 ~ ~ W tr [):> [):> W I:-' ru I.r1 'fj*"?'''C, ,f.'-," , " -~ . I ," "..' , ~ -~~r.."..:?"., '\ ! ~.~ - ({.:jbðö.::lj,c~ I 'I 'II' "Ii I r I ì r II I - J16H1 7736883125 ~,:'-'S,IŸ!r:lij--:'~ :~;i'~Ïi~j i~;:!!·;.( ~';,;-;:,;:;:~ï:1 -:~:..:;-~. ~~'0931-011ó-3 /O/3o/ý3 I ',,,, 'VII;);" PJ~c- h fA ~:~~ #J~ ¿ÎÐ;~'~r b0~~(~~~-';~~-;~j~~;'2~1 : ¡,,~ ~ ¿;'~~-J... 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