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HomeMy WebLinkAboutRISCK ANALYSIS REP. 1/15/2001I SOILS ENGINEERING, INC. I I RISK ANALYSIS REPORT For I I Schwebel Petroleum Company 900 Sacramento St. in 1 Bakersfield, California I Prepared For: 1 I Schwebel Petroleum Company 900 Sacramento St. Bakersfield, California I File No. 99-9015 ! Prepared By: I Soils Engineering, Inc. I 4700 District Blvd. Bakersfield, CA. 93313 I I I January 15, 2001 I 4400 YEAGER WAY ° BAKERSFIELD, CALIFORNIA93313 ° PHONE(661)831-5100 ° FAX:(661)831-2111 I SOILS ENGINEERING, INC. - I January 15, 2001 File Number 99-9015 I I I I I Mr. Howard Wines Bakersfield City Fire Dept. Office of Environmental Services 1715 Chester Ave. Bakersfield, CA., 93301 Subject: Risk Analysis Report Schwebel Petroleum Company Bulk Plant 900 Sacramento St. Bakersfield, CA. Mr. Wines: I I ! This Risk Analysis Report (Report) is submitted by Soils Engineering, Inc. (SEI) in accordance with ASTM standards for Risk Based Corrective Action (RBCA) as requested in a letter dated November 20, 2000 from the Bakersfield Fire Department Office of Environmental Services (BFDES). This Report incorporates laboratory data collected during site characterization activities to calculate the risk and hazard that constituents of concern at the site may have on on- site workers and the groundwater beneath the site. If risk or hazards exceed applicable levels for the site then appropriate cleanup standards are suggested for the site for each constituent of concern. I I ! I I I I BACKGROUND On August 4, 1998 BC Enterprises (BCE) removed one (1) 550-gallon waste oil UST and on May 7, 1999 BCE removed six (6) 6,000 gallon UST's. Elevated petroleum hydrocarbons were detected in soil samples collected beneath the waste oil UST and beneath the product pipeline extending from the 6 UST's to the northern and eastern dispensers and at the eastern end of the east-central tank (sample TK-3). The UST's evidently contained motor oils, gasoline, diesel, and mineral spirits over the period of operation. The BFDES requested additional site characterizations be conducted beneath the former waste oil UST and the former 6,000 gallon UST's to determine the lateral and vertical extent of the petroleum release. SEI advanced 1 soil boring in the area of the former waste oil tank and 5 soil borings to depths ranging from 35 feet to 81 feet in the area of the former underground storage tank CLIST's) areas and collected soil samples for chemical analysis in order to determine the lateral and vertical extent of the petroleum release. SEI's findings were submitted in a Site Characterization Report to the BFDES dated October 28, 1999. In a letter dated January 26, 2000, the BFDES requested a workplan addendum to further characterize the Eastern extent of the petroleum contamination. SEI prepared an addendum to the Workplan dated February 18, 2000, which was approved by the BFDES in a letter dated February 25, 2000. On March 10, 2000 SE! advanced 2 slant soil i 4400 YEAGER WAY ° BAKERSFIELD, CALIFORNIA93313 ° PHONE (661) 831-5100 ° FAX: (661) 831-2111 I I I Site Assessment Continuation Report 900 Sacramento St.., Bakersfield, CA. Schwebel Petroleum Co. SOILS ENGINEERING, INC. File Number 99-9015 January 15, 2001 Page 2 I I I I I I I I I I I I I I I borings (B-7 and B-8), located approximately 10 and 65 feet to the Northeast of soil boring B3, to collect soil samples for chemical analysis. A Site Characterization Continuation Report dated April 1 l, 2000 was prepared by SEI and contained the following conclusions. Based on field observations and soil sample analytical results SEI concluded the following: 1) Petroleum hydrocarbons are present in the soil from 30 to 60 feet bgs. at soil boring B-2 in the central area of the former UST's, from 30' to at least 40' bgs. at B-3, from 20' to approximately 35' bgs. at B-5, from 15' to 54' (vertical) at B-7 and from 20' to 40' at B-8. See Plate 3A and 3B for hydrocarbon plume cross-sections. The lateral extent of the petroleum hydrocarbon plume is approximately 100' in diameter east-west and 40' north- south. The benzene plume is approximately 70' east-west by 20' north-south. 2) The eastern extent of the petroleum hydrocarbon plume extends to at least the horizontal displacement of boring B-8, but is of less vertical extent (<40' bgs. vertical) and at decreasing concentrations. 3) Benzene concentrations in soil samples were highest at a depth of 50' at boring B-2 at 12.8 ppm. 4) The majority of the petroleum hydrocarbon plume is apparently mineral spirits, which is reported as TPHd in the analytical reports. The highest TPHd result is 23,600 ppm at 50' in boring B-2. 5) No MTBE concentrations were reported in the contaminated soil samples B3-30' and B7-40' analyzed by EPA Method 8260. MTBE concentrations reported by EPA Method 8020 are not as reliable as results utilizing EPA Method 8260. 6) Hydrocarbon stained soil is present between approximately 15' to 30' bgs. in borings B-2, B- 3, B-5 and B-7. 7) No significant petroleum hydrocarbons are present at borings B-4 and B-6 to a depth of 35' and 40' bgs., respectively. 8) Depth to groundwater in this area as reported by the Kern County Water Agency is approximately 220' bgs. or approximately 160' below the base of the TPHd plume at B-2. 9) The nearest public drinking water well (currently inactive) is over 500' north (upgradient) of the site. See attached historical analytical results in soil attached as Table 4. I I I ! Site Assessment Continuation Report 900 Sacramento St.., Bakersfield, CA. $chwebel Petroleum Co. SOILS ENGINEERING, INC. File Number 99-9015 January 15, 2001 Page 3 I I I I I I I I I I I I I ! I RISK ANALYSIS SEI utilized the computer-modeling program RBCA Tool Kit for Chemical Releases version 1.2 (RBCA Tool Kit) produced by Groundwater Services, Inc. for the risk analysis at this site. The RBCA Tool Kit is based on the ASTM document PS-104, Standard Provisional Guide for Risk- Based Correction Action. The RBCA Tool Kit consists of a series of Microsoft Excel spreadsheets that site-specific data is inputted into for each potential exposure pathway at the site for each constituents of concern (COC's). Potential Exposure Pathways Since there are no permanent structures directly over the soil plume and no surface water is present within ¼ mile of the site, the potential pathways for the COC's were narrowed down to the following: SOURCES EXPOSURE PATHWAY Affected Surface Soil Dermal Contact & Ingestion Volatilization to Surface Air Inhalation Affected Subsurface Soil - Leaching to Groundwater Volatilization to Surface Air Inhalation The Exposure Pathway Flowchart is attached in Appendix A and shows a graphic representation of the potential Exposure Pathways at this site. Affected Surface Soil Since the majority of the surface soil impacted with petroleum hydrocarbons has been removed or is not present in areas of potential dermal contact, this exposure pathway is considered minor at this site. Some volatili?ation to the surface may occur in the area of boring B-7 where near surface petroleum hydrocarbons were encountered. An asphalt surface will be covering the residual petroleum hydrocarbons left in-place further reducing potential dermal contact and volatiliTation to outdoor air. Affected Subsurface Soil The affected soils containing petroleum hydrocarbons are present from a depth of approximately 20' to 65' below ground surface (bgs.) in the area of the former UST's and beneath the product pumps to the east of the former UST's. Groundwater has been reported to be at a depth of approximately 220' bgs. beneath the site, in reports prepared by the Kern County Water Agency. This leaves a non-impacted area of soil approximately 155' thick before the present petroleum hydrocarbon plume ever reaches the groundwater beneath the site. According to the soil borings conducted at the site the majority of the petroleum hydrocarbon impacted soils are Sandy Silt with I I I I Site Assessment Continuation Report 900 Sacramento St.., Bakersfield, CA. Schwebel Petroleum Co. SOILS ENGINEERING, INC. File Number 99-9015 January 15, 2001 Page 4 I I I I I '1 I I I I I I I I I Iow permeability. Petroleum hydrocarbons in low permeability soils such as Sandy Silt are less likely to migrate unless a continual source is present or water infiltration occurs into the plume. Since the source of the petroleum hydrocarbons (the UST's) has been removed no additional petroleum hydrocarbons are expected to enter this area. Since this area will be covered with asphalt the amount of rainwater infiltration into the existing residual petroleum hydrocarbon plume is very minor, further reducing the potential for the plume to migrate deeper. The nearest drinking water well (California Water Service Station 78-01) to the plume area is over 500' north (upgradient) and completed in a zone hundreds of feet deeper than the base of the plume. Constituents Of Concern The constituents of concern (COC) at this site are the volatile organics benzene, toluene, ethylbenzene, and xylenes (BTEX) reported in the soil samples collected at this site. Naphthalene was also included as a COC since it was reported at 10.5 parts per million (ppm) in the 40' soil sample from boring B-7. Total petroleum hydrocarbon (TPH) concentrations reported in the soil samples collected at the site were not included in this risk analysis in accordance with ASTM E 1739 - 95 Standard Guide for Risk-Based Correction Action Applied at Petroleum Release Sites (section 6.4.3). The reported concentrations of BTEX and naphthalene from the soil samples analyzed from the site characterization borings were inputted into the Soil Source Zone Concentration Calculator spreadsheet to determine the appropriate concentration of each COC to use in the risk analysis calculations. The 95% upper confidence level (UCL) of the mean concentration reported for each COC was used for this risk analysis. The maximum concentration, the mean concentration and the 95% UCL concentration for each COC are presented in the RBCA Tool Kit Soil Source Zone Concentration Calculator spreadsheet included in Appendix A. Risk & Hazard Modeling & Calculations After inputting the site-specific data (COC concentrations, soil characteristics, groundwater depth, plume dimensions, etc.) into the RBCA Tool Kit program the risk and hazard for each potential pathway at a commercial site was calculated. For a commercial site an acceptable individual COC risk is 1 x 10~ and a cumulative COC risk of 1 x 10'5. For a commercial site an acceptable hazard quotient and hazard index is 1.0. Two different RBCA Tool Kit Soil to Groundwater Leaching transport modeling options were evaluated at this site. The first transport modeling utilized the ASTM model with soil attenuation and first order biodecay (with default values). The second transport model utilized the ASTM model with only soil attenuation. The risk analysis utilizing biodecay shows that the vadose plume never reaches the groundwater and therefore the cumulative risk and the total hazard to the groundwater beneath the site is so small that it is not calculated (NC) in the Tier 2 Baseline Risk Summary Table. Not utilizing the biodecay factor the cumulative risk to the groundwater beneath the site is an acceptable 5.2 x 10'g I Site Assessment Continuation Report 900 Sacramento $~.., Bakersfield, CA. $chwebel Petroleum Co. SOILS ENGINEERING, INC. File Number 99-9015 January 15, 2001 Page $ I I I I I I I I I I I I I and the total hazard index is an acceptable 0.002. So utilizing either ASTM transport model it appears that this vadose plume can be left in-place without an elevated risk or hazard to the groundwater beneath the site. The calculated individual and cumulative COC risk and hazard quotients and hazard index for each pathway at the site are shown on the Tier 2 Baseline Risk Sununary Table. Since 2 different transport models were evaluated, the resulting two (2) Tier 2 Baseline Risk Summary Tables are attached as Table 1 (with biodecay) and Table 2 (without biodecay). Other tables and graphics from the RBCA Tool Kit are included in Appendix A (with biodecay) and Appendix B (without biodecay). The Outdoor Air Exposure Pathway had acceptable risks and acceptable hazards for both transport models. The Indoor Air Exposure Pathway was not evaluated since no permanent structures are present over the plume area. The Soil Exposure Pathway had an individual risk of 1 x 10'6 (equal to the target risk) and an acceptable cumulative risk of 1 x 10'6. The hazard quotient and index for the soil pathway are acceptable at 3.2 x 10-2 and 5.7 x 10'2, respectively. As stated above, the Groundwater Exposure Pathway had acceptable risk and hazards calculated utilizing both ASTM transport models. The Surface Water Exposure Pathway was not evaluated since no surface water is nearby the plume area. Site-Specific Target Levels Utilizing the RBCA Tool Kit site-specific cleanup levels can be calculated. According to the Soil (20' to 65') Site-Specific Target Levels (SSTL) attached in Appendix C and presented as Table 3, the groundwater beneath the site may be threatened when average benzene concentrations are >66 ppm, toluene is >790 ppm, ethylbenzene is >640, xylenes are >510 ppm and naphthalene is >620 ppm in the soil plume. The 95% UCL on each of these COC's is less than these concentrations. Only xylenes reported at 1320 ppm in soil sample B7-40' exceeds any of these values as a maximum COC concentration. The calculated SSTL for benzene (3.2 ppm) is exceeded in only 3 soil samples (B2-45', B2-50', and B7-40') collected at the site. The SSTL for the other COC's are not exceeded in any of the soil samples. DISCUSSION The only elevated risk or hazard according to the RBCA Tool Kit calculations is in the individual COC soil exposure pathway for benzene. Since the amount of surface soil contamination is very minimal (only around boring B-7) and the surface plume area will be covered by asphalt this exposure pathway will be nearly eliminated. The cumulative risk for all pathways (air, soil and groundwater) is 1.19 x 10'6 and the cumulative hazard index for all pathways is 0.106, both acceptable values for a commercial site (< 1 x 10.5 and <1.0, respectively). According to the RBCA Tool Kit calculations there is no elevated threat to on-site workers or to the groundwater beneath the site. I SOILS ENGINEERING, INC. I Site Assessment Continuation Report File Number 99- 901 $ i 900 Sacramento St.., Baltersfield, CA. January 15, 2001 Schwebel Petroleum Co~ Page 6 RECOMMENDATIONS I SEI recommends the implementation of the natural attenuation remedial alternative suggested in the Site Characterization Continuation Report dated April 11, 2000, with the placement of an i asphalt cap over the in-place petroleum hydrocarbon plume. Please call Soils Engineering, Inc. at (661) 831-5100 if you have any questions concerning this Risk Analysis Report. ~x~:~_ I ~. _ I Enviroumental Divisi;~ ~I~a~a~;r I I I ! I I I I I Enclosures: Table 1, Tier 2 Baseline Risk Summary Table (with Biodecay) Table 2, Tier 2 Baseline Risk Summary Table (without Biodecay) Table 3, Soil (20'-65') SSTL Values (without Biodecay) Table 4, Historical Analytical Results - Soil Location Map, Plate 1 Plot Plan, Plate 2 Appendix A: RBCA Toolkit Calculations (with Biodecay) Appendix B: RBCA Toolkit Calculations (without Biodecay) 1 TABLE 1 (With Biodecay) RBCA Tool Kit for Chemical Releases, Version 1.2 Baseline Risk~ Site Name: SchwebelPetroleum Company Completed By: Soils Engineering,Inc. Site Location: 900 Sacramento St., Bakersfield,CA. Date Completed: 10-Jan-01 1 of TIER 2 BASELINE RISK SUMMARY TABLE BASELINE CARCINOGENIC RISK BASELINE TOXIC EFFECTS Individual COC Risk Cumulative COC Risk Risk Hazard Quotient Hazard Index Toxicity EXPOSURE MaximumI Target Total Target Limit(s) Maximum I Applicable Total I Applicable Limit(s) PATHWAY Value Risk Value Risk Exceeded? Value Limit Value Limit Exceeded? OUTDOOR ~IR EXPOSURE PA THWA YS Complete:ll.OE-711.0E-6 1.9E-711.0E-5I [] I~.~-~l,.o~.oi,.~-~I ~ INDOOR AIR EXPOSURE PA THWA YS SOIL EXPOSURE PA THWA YS OROUNDWA TER EXPOSURE PA THWA YS Complete:I NC 1.0E-6I NC I 1.0E-5 I [] I NC I 1.0E+0 NC I 1.0E+0 I [] SURFACE WA TER EXPOSURE PA THWA YS CRITICAL EXPOSURE PATHWAY (Maximum Values From Complete Pathways) Soil Soil Outdoor Air Soil m m m m m m m m m m m m m m m m m m m TABLE 2 (Without Biodecay) RBCA Tool Kit for Chemical Releases, Version 1,0 Baseline Risk Summary-All Pathways Site Name: Schwebel Petroleum Completed By: Site Location: Date Completed: 0-Jan-00 1 of TIER 2 BASELINE RISK SUMMARY TABLE a BASELINE CARCINOGENIC RISK BASELINE TOXIC EFFECTS Individual CCC Risk Cumulative CCC Risk Risk Hazard Quotient Hazard Index Toxicity PATHWAY Value Risk Value ,, Risk Exceeded? Value Limit Value Limit Exceeded? OUTDOOR AIR EXPOSURE PA THWA YS INDOOR AIR EXPOSURE PA THWA Y$ Complete:INA NAINAINAI [] I"AI NA INA NAI [] SOIL E)(POSURE PA THWA Y$ Complete:l 1.0E-6I .I [] GROUNDWATER EXPOSURE PATHWAYS Complete: I 5.2E-8 1.0E-~ I 5.2E-e I 1.0E-5I [] I 1.17E-3 I 1.0E+0 2.0E-3 I 1.0E+0I [] SURFACE WA TER EXPOSURE PA THWA YS Complete:INA NAI NAI NA [] INAI NA NAI NAI [] CRITICAL EXPOSURE PATHWAY [Maximum Values From Complete Pathways) Soil Soil Soil Soil TABLE 3 SOIL SSTL VALUES RBC. A Tooi ~t for Chemical Releases, Ve~on 1.2 S~te Name: $<:fwve{~ Pe~e~ C.,~apleted By. Job ID: Stte Localloa: Date Completed: 0-Jan-00 I OF' I Tlrg~ RIsk (CIiII A & B) 1.0E-6 SOIL (20 - 65 ft) SSTL VALUES T.r~ RIIk (C~asl C) 1.0E-5 Gro~'td~tlr DAF O~tlo~ Demealca- FI~ ~ T~ H&m~d ~ 1.0E~ (Of~-dm~i~al v~t. dspef~m} CONSTITUENTS OF CONCERN CAS No. INam~ 1330-20-7 IX .~. ne (mb(ed isomers) 71-43-2 IBenzene 1100-41-4 JEt~lbenzene 191-20.:3 [Naphthalene Co~c~ration (m~<g) 2.5E+2 5.7E+1 3.4E+0 3.6E+1 1.1E+1 X ~ $~ Leaching lo Groundwater I On-lite Off-lite ! Off*~te 2 >5.1E+2 >5.1E+2 >7.9E+2 >7.9E+2 6.6E+1 1.7E+2 >6.4E+2 I >6.4E+2 ~ >6.2E+2 , j >6.2E+2 NA NA NA NA NA Off-lite 2 NA NA NA NA NA '> ' indicates ~is~-based Mrget coacent'al~l ~reat~ ~mn constltuer4 residual saUa~ ~. NA - Not ap~cable. NC - Not cetculated. TABLE 4 HISTORICAL SOIL ANALYTICAL RESULTS $chwebel Petroleum Company - Bulk Plant 900 Sacramento Street, Bakersfield, CA. Ethyl Sample Sample TRPH TPHg TPHd Benzene Toluene i Benzene Xylenes MTBE 8260Volatile No. Date (ppm) (ppm) (ppm) (ppb) (ppb) (ppb) (ppb) (ppb) CAM 17 Metals Organics (ppb) B1-10' 9/1/99 13000 615 24400 <5 6.79 1130 1~60~) <10 No Elevated PCE=105 B1-15' 9/1/99 1100 <10 1590 <5 <5 <5 <15 <i0 B1-20' 9/1/99 3100 <10 3840 <5 16 <5 <15 20.7 B1-30' 9/24/99 <50 <10 <10 <5 <5 <5 <15 <10 B1-40' 9/24/99 <50 <10 <10 <5 <5 <5 <15 <10 B2-20' 9/i/99 <50 <10 <10 <5 <5 <5 <5 36.5 B2-30' 9/1/99 4100 55.9 6760 <200 <200' <200 3340 <1300' B2-45' 9/1/99 2100 665 13400 4350 <280 933 <550 <1800 B2-50' 9/24/99 17000 3460 23600 12800 <950 <950 <1900 <6400 B2-65' 9/24/99 <50 <10 <10 <5 <5 <5 <15 <10 B2-75' 9/27~99 <50 <10 <10 <5 <5 <5 <15 <10 B2-81' 9/27/99 <50 <10 <10 <5 <5 <5 <15 <10 B3-15' 9/2/99 <50 <10 <10 <5 <5 <5 20 96.6 B3-25' 9/2/99 <50 <10 <10 <5 <5 5.15 37.1 1900 B3-30' 9/2/99 NA NA 2080 142 160 17900 104940 *<5 See BTEX&MTBE B3-40' 9/2/99 800 1330 1560 657 11800 13200 68000 <1500 B4-15' 9/2/99 <50 <10 <10 <5 <5 <5 <15 <10 EN-25' 9/2/99 <50 <10 <10 <5 <5 <5 <15 <10 B4-35' 9/2/99 <50 <10 <10 <5 <5 <5 <15 <10 B5-20' 9/2/99 230 < 10 492 <5 <5 <5 <15 27.9 B5-30' 9/2/99 3000 14 4290 <20 <20 <20 6260 <42 B5-40' 912/99 <50 <10 <10 <5 <5 <5 <15 <10 Page 1 TABLE 4 (cont.) Ethyl Sample Sample TRPH TPHg TPHd Benzene Toluene Benzene Xylenes MTBE 8260 Volatile No. Date (ppm) (ppm) (ppm) (ppb) (ppb) (ppb) (ppb) (ppb) CAM 17 Metals Organics (ppb) B6-30' 9/2/99 <50 <10 <10 <5 <5 <5 <15 <10 B6-40' 9/2/99 <50 < 10 <10 <5 <5 <5 <15 <10 ROB-1 9/2/99 2300 <38 2130 <5 7.09 30' 505 *<10 No Elevated, pH=8.0 See BTEX&MTBE B7-20' 3/10/00 NA 1,530 2,650 ND ND 13,200 85,200 ND B7-30' 3/10/00 NA 2,090 5,970 ND ND 27,000 178,000 ND B7-40' 3/10/00 NA 8,590 4,200 9,280 340,000 204,000 1,320,000 ND 'Napthalene = 10,500 B7-50' 3/10/00 NA 639 ND 1,320 18,500 11,500 74,100 ND B7-60' 3/10/00 NA 808 ND ND 3,870 10,900 72,600 ND B7-65' 3/10/00 NA 23.7 ND 73.4 394 320 2,550 ND B8-20' 3/10/00 NA 270 9,600 ND ND 334 6,750 ND B8-30' 3/10/00 NA 249 8,900 ND ND 322 6,330 ND B8-40' 3/10/00 NA 275 2,180 ND ND ND ND ND B8-50' 3/10/00 NA ND ND ND ND ND ND ND Notes: ppb=parts per billion(ug/I or ug/kg),ppm=parts per million(mg/I or mg/kg), MTBE=Methyl Tertiary-Butyl Ether, NA = Not Analyzed PCE = Tetrachloroethene, * = Analyzed by EPA Method 8260 Page 2 ~ I Location & Hospital Map Schwebel Petroleum Co. I 900 Sacratnento, Bakersfield, CA. SOILS ENGINEERING, INC. File No. 99.9015 Jury, 1999 Plate I N f · ~T CC COLUMBUS '3 PLATE 1 LOCATION & HOSPITAL MAP Schwebel Petroleum Co. 900 Sacramento, Bakersfield, CA ! ~,,,,Concrete ,t~t~t~t%t~ ~'~',Barrel Pad 2' High Block Wall ~¢T~ Formor 500 ~al ~;.~mp~ :,~ Waste Oil Tank ;~.~arrel ,'~ , :~:~:3~. ~ Solvent Small Containing Oil or Emp~ Panel For 2' High ~lock Wail Product Pumps Empty 55-Gallon Drums LEGEND Slant Boring (25-Degree) Soil Boring Main Electrical Panel -;~ ~ Steam Cleaner Hydraulic Asphalt Barrel Hoist ~,,,~"<Plant Office wn Area , Product ~ck Fill Stand Pure Diesel & Gas Disenser 'AST's., B-3 COl Basin 2200 gallon 0' 20' I ~ S a c r a m e n t O Approx. Scale G t !pproximate UPPR Lease Line Foamer Tank ~ - 25k Red Carb Diesel #2 - 25k Aviaion Gas 6' High BIockWall ~3 -2Sk 87 Octane Gas #4 - 25k Red Diesel #5 - 12k Solvenl(Min. Spirits) 40' ~6 = 25k Clear Carb Diesel · 1 Railroad Tracks #7. ,2k 92 Oc,ane Gas #8 - 10k Xyseila 40 Oil 119.10k 15w.40w Oil SOILS ENGINEERING, INC. 4700 District Blvd. Bakersfield, CA 93313 PROJECT NUMBER: 99.9121 SCHWEBEL PETROLEUM COMPANY PLATE 900 Sacramento Street Bakersfield, CA 2 Plot Plan I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I SOILS ENGINEERING, INC. Appendix A RBCA TOOL KIT CALCULATIONS (With Biodecay) m m m mm m == m m m m m m m m m m mm m m RBCA Tool Kit for Chemical Releases, Version 1.2 Main Screen ,,CATool Kit for Chemical Releases Version 1.2 © 1999 1. Project Information Site Name: SchwebelPetroleum Company Location: 900 Sacramento St., Bakersfield,CA. Compl. By:;Soils Engineering,Inc. Date:l 10-Jan-01 I Job ID:19015 2. Which Type of RBCA Analysis? ~.'O-~'~!~'~!~' ~'. ' ::. "~' "' Generic Values Site-Specific Values On-Site On- or Off-Site Exposure Exposure 3. Calculation Options Affects which input data are required ~ Baseline Risks (Fo~ard mode) ~ RBCA Cleanup ~tandards (Bac~r~ mo~e) 4. RBCA Evaluation Process Prepare Input Data I! Review Output Data Complete? ( · yes ~llno) mn ExposurePathways ~il I 111 Exposure Flowchart [] Constituents of [. COC Chem. Parameters · Concern (COCs) ~ + ' ~I Input Data Summary I m[] Transp°rtM°dels III User. Spec. COCData... 1 + I m [::] Soil Parameters ~ ~ ~ i i I Transient D°menic° Analysis'" I mn GWParameters I I BaselineRisks... 1 !mn Air Parameters ! I Cleanup Standards... ) 5. Commands and Options ~' New Smte ~' Load Data... ~ Save Data As... "' Print Sheet )~ Set Units '~' Custom Chem. Data... ~ Help RBCA Tool Kit for Chemical Releases, Version 1.2 Exposure Pathway Identification 1. Groundwater Exposure Groundwater Ingestion/ Surface Water Impact Receptor J Com. I~'J Icom. I'1 None Source Media: [] Affected Groundwater [] Affected Soils Leaching to Groundwater Distance to GW receptors On-site Off-site1 Off-site2 100 ·. ':Enter ALP Criteria ) 2. Surface Soil Exposure Direct Ingestion  and Dermal Contact Receptor Com. I'" No off-site t~!~iI Type:I On-site I receptors Construction Worker [] I 3. Air Exposure Receptor Type: Volatilization and Particulates to Outdoor Air Inhalation Com. I~' None I~'[ Off-site1 _Off-s_]te2 t 100 .,, Construction worker [] Affected Soils--Volatilization to Ambient Outdoor Air [] Affected Groundwater-Volatilization to Ambient Outdoor Air [] Affected Surface Soils--Particulates to Ambient Outdoor Air I~i Volatilization to Inhalation Indoor Air ~~!~!i! Receptor IN0ne I' I No off-site Type: I On_site I receptors [] 4. Commands and Options Main Scree~'~T Print Sheet' ~{~ Set Units ~ Help · [] Exposure Factors & Target Risks ~{ Exposure Flowchart RBCA Tool Kit for Chemical Releases, Version 1.2 Exposure Pathway Flowchart Source Media Transport Mechanisms Receptors off-site1 Affected Volatilization Leaching Dispersion Exposure Media Soil Dermal Contact and Ingestion Surficial Soils Affected Subsurface Soils Groundwater Transport Air Inhalation of Vapor and/or Particulates Groundwater Potable Water Ingestion On-site Com./Constr. Off-site2 NA NA Outdoor Air: ComJConstr. Commercial None None NA NA Commercial Commercial None NA NA NA lCommands and Options RBCA Tool Kit for Chemical Releases, Version 1.2 Transport Modeling Options 1. Vertical Transport, Surface Soil Column 0 0 Outdoor Air Volatilization Factors ~ Surface soil volatilization model only Combination surface soil/Johnson & Ettinger models User-specified VF from other model (~ - Enter VF Values L/';~.'i*':i,~', ~!~".'" . : = [.: .~;....:. EnterVF Values ...) Soil. to-Groundwater Leachin.q Factor ASTM Model [] Apply SoilAttenuation Model (SAM) [] Allow first-order biodecay {m [] Enter Decay Rates User-specified LF from other model ( Enter LF Values 2. Lateral Air Dispersion Factor wind ~ ~ ~ / 3-D Gaussian dispersion model Off-site 1 Off-site 2 User-Specified ADF 0 0 Enter Directly Calculate DAF using Domenico Model Domenico equation with dispersion only (no biodegradation) Domenico equation first-order decay ~= [] Enter Decay Rates Modified Domenico equation using /..::?;~.;.~:'.;~ Enter?Site Data'::~ electron acceptor superposition "'~'""'" ..... ' :' .... "'"' User-Specified DAF Values O DAF values from other model or site data ~ 4. Commands and Options ~[~ '~.M.ain' screen ~ RBCA Tool Kit for Chemical Releases, Version 1.2 Constituent Half-Life Values ~ns Print Sheet Constituent Saturated Zone First-Order Decay Half-Life Coeffecient (day) (l/day) 3.6E+2 2.8E+1 7.2E+2 2.3E+2 2.6E+2 Unsaturated Zone First-Order Decay Half-Life Coeffecient (day) I (l/day) I 3.6E+2 2.8E+1 7.2E+2 2.3E+2 2,6E+2 RBCA Tool Kit for Chemical Releases, Version 1.2 Site-Specific Soil Parameters 1. Soil Source Zone Characteristics Hydrogeology Depth to water-bearing unit Capillary zone thickness Soil column thickness Affected Soil Zone Depth to top of affected soils Depth to base of affected soils Affected soil area Length of affected soil parallel to assumed wind direction Length of affected soil parallel to assumed GW flow direction General Case Construction 220 20 .5_. 0.9J 1 5001(f ^2) ~2 II ~2 I(ft) ;olumn Predominant USCS Soil Type or ~ Enter Directly Total porosity Volumetric water content Volumetric air content Dry bulk density Vertical hydraulic conductivity Vapor permeability Capillary zone thickness Net Rainfall Infiltration Net infiltration estimate or (.. Enter Directly Average annual precipitation Partitioning Parameters Fraction organic carbon Soil/water pH JML: Sandy Silt or (-) (in/yr) or 6 (in/yr) 0.04 J(-) 6.8 N 3. Comm~nds and Options Main Screen I~( ..... ~ Print Sheet ~ . , values ,- Set Un,ts ~ iii Help RBCA Tool Kit for Chen~cal Releases, Version 1.2 Input Parameter Summary m Site Name: Sch~a~elPelmleum Company Site Location: 900 Sacramento St., Bakersfield,CA. Completed By: Soils Engineering,Inc. Job ID: 9015 Date Completed: 10-Jam01 f OF f ExpoM.u'e Poremstsm RssldentlM C omrnerclet/Indusa'iet ATe Averaging Use for cami~og~ (yr) 70 ATn Averaging time for hat,carcinogens (yr) 30 25 1 8W Body weight (kg) 70 15 35 70 ED ~ dJraflon (yr) 30 6 16 25 1 ~ Averaging time for vap~ flux (yr) 30 25 1 EF Exlx)sure f~equency (days/~) 350 250 180 EFD Exposure frequency for dermal exposure 350 250 IR. Ingestion rate of water (L/pay) 2 1 IR, Inge~on rat s of ~341 (n~day) 100 200 50 100 SA Sldn surface sras (dennel) (Ch'P2)5800 20235800 5800 M ~ to sldn scherencs facto~ 1 ET~m Swimming exposure time (hrlevent) 3 EV.,,m Swimming event frs quency (event~/r} 12 12 12 IR,,,m Water Ingestion v/nile s~mmlng (L/hr) 0.05 0.5 ~ Sldn mcface sraa for s~mmlng (cm~2) 23000 81(]0 (~, %ngestion fate of ~sh (kgb/r) 0.025 FIR C~tamineted fish fraction (unitlsss) 1 Commie Exposure Pmhwa~ e~l Receptors On-ails Off-site t Off-stta 2 Oroune%vstec (~n~wster ing~tlon None None None Sots Leaching to G¢ound#at er Ingestion Cornmerclal Commercial None ~canie Gufface Water EXpOlU~e Ro~es: Swlnl~ng NA A~attc Life Prctection NA Direct Ingestion and De.et Co~tsct Com./Constr. Out,tear Nr: pa~culates from Sun'acs ~oila None Nor,.e None VobUIb~flon from Soils Com./Constr. Commerc;al None V¢flatilizsUon from Groundwater None None None Voietilizstlon from Subsurface So(ts None NA NA Volsti~tion from Groundwater None NA NA Recaptor D~tan~e from BouJ~ca Media On-stie Off.41te Groum~.veter race,or I NA NA NA (it) I Soft leaching to g'ot~:]weter rane~or Outdo~ air inhaiatt<m receptor 0 10O NA (it) J Tar~lst Health RIIk Vetuel Individ~lai Cumulative TR~ Tsrgct Risk (clas~ A&B carcinogens) I 1.0E-6 1.0E-5 TRc Target Risk (cMss C carcinogens)I 1.0E-$ 1HQ Target Hazard Quotient (non-carctn~enic risk) 1.0E+0 1.0E+0 Modeang Options RBCA tier l~er 2 Outd;~' air ~ m~l ~ce ~ ~ I~ air ~fion ~1 ~ ~ ~1 aff~ti~ ~ (~) f~ leac~te? Yes Nr d~ ~ ~D Gaus~ d~ton NOTE: NA = Not al3:acable Surface Paran~em Gonend Construction A Source z~e area 4.5E+3 4.5E+3 (~2) W LarCh of ~oume-~=ne area paraffai to wind 1.1E+2 1.1E+2 (.3) We, Lm~h of so~rce-zune area parailel fo GW flow 4.0E+1 (it) Uu ~N,~ble~ ~ vekx31ty In mixing ~ 7.4E+O {~s) &~ AJr mtidng z~ne height 6.8E+0 (.3) P= Areal particulate emission rate NA (g/orrr~2/S) L,, ThIGl~ess of affected surface sails NA (it) Surface $oll Column Parameters Vstue (Ur4tl) hca, Cal~lla~ z~e ~c~ss ~ ~ Valse =ne ~c~ass ~ (~) ps ~1 ~k ~nslty 1.7E+0 (~3) f~ Fm~lon m~c ca~ 1.0E-2 (-) eT ~llt~t ~o~y 4.3E-1 (-) ~ V~l~l hy~c ~Mty 2.CE-2 (~ ~ Va~ ~ea~Uty 1.1E-14 (~2) ~ De~ to ~ter 2.2E+2 (fi) L~ ~ to top ~ ~e~ed s~la 2,0E+1 (~) L~ ~s ~ ~e~ed ~la 4.5E.1 (~) ~ ~lV~ter ~ 6,8E+0 ~ V~E~¢ ~ter c~e~ 0.387 0,2~ 0.12 (-) Ga Vo~c air ~e~ 0.~ O.17 O.~8 (-) Bulldln~ peromotors Residential Commercial L~ auJ~dng valse/area ratio NA NA (.3) A~ Foundation ama NA NA (crn~) Xc~ F ou~da'~on pedmeter NA NA ER Bullring air exchange rate NA NA (lis) L~ Foundation thickness NA NA Z~ Deplfl to boffom of fonndatlon slobNA NA (.3) q Foundation crook fraction NA NA (-) dF' indoor/outdoor clffarentlai pressure NA NA (g/cm/l*2) Q~ Convective air flow through slab NA NA (.3~3/s) Groundwater Paremeterl Value (Un~} ~,~v Groundwater mixing zone depth 8.6E+0 (.3) I; Net ;ro~ndweter Infiltration rate 8.2E-2 On/~] U~ Groundwater Darcy velocity 2.2E-1 (R/d) Vg. Geouno~vater seepage velo~ty 5.9E-1 (~ K~ Satumfod hydra~c con~ctlvtt y 2.2E+1 (Wd) I G~oundwater g-adent 1.0E-2 (-) S~ Wroth of g.o~-x]wet er source zone 1.5E+2 (fi) So Depth of ~-oundwat er source zone 8.6E+0 (it) $~ Effective poroxit ¥ in water-bearing unit 3.8E-1 (-) f0¢.,~t Fraction organic cad)on in wst~-beartng ut~t 1.0E-$ (-) pH~= Groundivatsr pH 6.2E+0 (-) Biopag, adation considerecl? 1st Order Transport peremsters Off.41ta 1 Off-lite 2 Off41te t Off41te 2 (unlt~) e.~ Longltudnai d~oersivlty NA NA 1.0E+1 NA (.3) ~ Tmnsveme dsparsivlty NA NA 3.3E+0 NA (.3) ~z VeKica~ dsperst~ty NA NA 5.0E-1 NA (.3) ay Transverse dspersion coefficient 1.1E+1 NA NA NA (.3) oz Vsrtical clsperNon coefficient 7.6E+0 NA NA NA (~) ADF Air deparsion factor 1.7E+0 NA NA NA , (-) (f~3/s) .A (it) I NA ('3) W~ Width of GW plu~ne at SW d scharga ~p~ l~lckness of GW plume et ~N d schorge DFc, Groun<Nmter-to-sufface water cllution factor RBCA Tool Kit for Chemical Releases, Version 1.2 Return Print Sheet Soil Source Zone Concentration Calculator UCL Percentile Estimated (~ Mean Option ~ Detection No. of No. of Distribution Max, Mean UCL on Constituent Sam Detects of Data Conc, Conc, Mean Limit 1.5E-2 5.0E-3 5.0E-3 5.0E-3 5.0E-3 Page 1 of 5 RBCA Tool Kit for Chemical Releases, Version 1.2 Enter Analytical Data from Soil Source Zone (up to 50 Data Points) 1 2 3 IDI B2-30 B2-45' I B2-50' Date Analytical Data 4 5 6 7 8 9 10 11 12 13 B3-25' I B3-30' B3-40' I B5-20' B5-30'I B7-20'I B7-30' B7-40' I B7-50' B7-60' (mg/kg) (mg/kg) (rog/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (rog~kg) (mg/kg) (rog~kg) (rog/kg) 3.34E+0 5.50E-1 1.90E+0 3.70E-2 1.05E+2 6.80E+1 ~.5-0E--'2 ~.26E+0 8.50E+1 1'.78E+2 1.32E+3 7.41E+1 7.26E+1 2.00E-1 2.80E-1 9.50E-1 5.00E-3 1.60E-1 1.18E+1 5.00E-3 2.00E-2 8.90E-1 5.00E-3 3.40E+2 1.85E+1 3.87E+0 2.00E-1 9.33E-1 9.50E-1 5.00E-3 1.80E+1 1.32E+1 5.00E-3 2.00E-2 8.90E-1 5.00E-3 2.04E+2 1.15E+1 1.09E+1 2.00E-1 4.35E+0 1.28E+1 5.00E-3 1.42E-1 6.57E-1 5.00E-3 2.00E-2 8.90E-1 5.00E-3 9.28E+0 1.32E+0 5.20E-1 5.00E-3 1.05E+1 1.05E+1 Page 2 of 5 RBCA Tool Kit for Chemical Releases, Version 1.2 Analytical Data 14 15 16 17 18 19 20 21 22 23 24 25 26 (mg/k~l) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) 2.55E~-0 6.75E+0 6.33E+0 1.90E-1 3.94E-1 7.60E-2 9.00E-2 9.50E-2 3.20E-1 7.60E-2 3.22E-1 9.50E-2 7.40E-2 7.60E-2 9.00E-2 9.50E-2 Page 3 of 5 RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Baker~ Completed By: Soils Engineering,inc. Date Completed: 10-Jan-01 TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION 1 OF ISOILEXPOSURE PATHWAY · (CHECKED IF PATHWAY IS ACTIVE) SURFACE SOILS OR SEDIMENTS: ON-E~TE INGESTION AND 1) Source/Exposure Medium 2) Exposure Multiplier 3) Average Daily Intake Rata DERMAL CONTACT (IR+SAxMxRAF~xEFxED/(BWxATI (k~k~'da¥1 (rn~k~/dayI (1~ x (27 Constituents of Concern Surface Soil Conc. (rng~g) Commercial Construction Worker Commercial Construction Worker Xylene (mixed isomers) 2.5E+2 2.9E-5 2.1 E-5 7.1 E-3 5.2E-3 Toluene 5.7E+1 2.9E-5 2.1 E-5 1.6E-3 1.2E-3 Ethylbenzene 3.6E+1 2.9E-5 2.1 E-5 1.0E-3 7.6E-4 Benzene 3.4E+0 1.0E-5 3.0E-7 3.5E-5 1.0E-6 Naphthalene 1.7E+1 3.3E-6 2.7E-6 5.7E-5 4.7E-5 INOTE: RAF = Relative absorption factor (-) M = Adherence factor (mg/cm^21 Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Bakersfield,CA. Completed By:. Soils Engineering,inc. AT = Averaging time (days) BW = aod~' wei~lht ED = Exposure duration (yrs) EF = Exposure frecluenceY Date Completed: 10-Jan-01 Job ID: 9015 IR = Soil ingestion rate (mg/day) SA = Skin exposure area ~cm^2/day) RBCA Tool Kit for Chemical Releases, Version 1.2 TIER 2 PATHWAY RISK CALCULATION ISOIL EXPOSURE PATHWAY · (CHECKED IF PATHWAY I$ ACTIVE) CARCINOGENIC RISK (1) EPA (2) Total Carcinogenic Intake Rate (rng/l(g/day) (3) Slope Factor (4) Individual COC Risk Caminogenic {;a) via In~lestion lb) via Dermal Contsct lc) via In~leslton ~d~ via Oen'nsl Cor~ct (rng/~g/da¥)~-I (2e)x(3a) + (2b)x[3b) (2c)x(3a) + (2d)x(3b) Classification Commercial Construction Worker (a) Oral (b) Dermal Commercial Construction Constituents of Concern Worker Xylene (mixed isomers) D Toluene D Ethylbenzene D Benzene A 5.9E-7 3.4E-5 3.4E-8 9.8E-7 2.9E-2 3.0E-2 1.0E-6 3.0E-8 Naphthalene D No dermal slope factor available-oral sloi3e factor used. Total Pathway Carcinogenic Risk = ~ 1.0E-6 [ 3.0E-8 ] Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Bakersfield,CA. Completed BT. Soils Engineering,Inc. Date Completed: 10-Jan-01 Job ID: 9015 RBCA Tool Kit for Chemical Releases, Version 1.2 6 OF 10 TIER 2 PATHWAY RISK CALCULATION [SOIL EXPOSURE PATI"IWAY · <CHECKED IF PATI'IWAY IS ACTIVE) TOXIC EFFECTS (5) Total Toxicant Intake Rate (rng/kg/day) (6) Oral (7) Individual CDC Hazard Quotient ga) via In~tio~ ~b) via Den'nal Contact ~c~ via ~n~-lion Id~ via Dermal Contact' Reference Dose (rog/kg-day) (5a~6a) + (5b~6~) (5c)/(6a) + (5<:1)/(6b) Construction Cortstltuents of Concern Commercial Construction Worker (a) Oral (b) Dermal Commercial Worker ..Xylene (mixed isomers) 1.2E-4 7.0E-3 1.7E-4 5.0E-3 2.0E+0 1.8E+0 3.9E-3 2.8E-3 Toluene 2.8E-5 1.6E-3 4.0E-5 1.2E-3 2.0E-1 1,6E-1 1.0E-2 7.5E-3 Ethylbenzene 1.8E-5 1.0E-3 2.5E-5 7.4E-4 1.0E-1 9.7E-2 1.1E-2 7.9E-3 Benzene 1.6E-6 9.5E-5 2.4E-6 6.9E-5 3.0E-3 3.0E-3' 3.2E-2 2.4E-2 Naph~alene 8.4E-6 4.9E-5 1.2E-5 3.5E-5 4.0E-1 3.6E-1 1.6E-4 1.3E-4 No dermaJ reference dose avai~eble--~rel reference dose used. Total Pathway Hazard Index = Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Bakersfield,CA. Completed By:. Soils Engineering,lnc. Date Completed: lO-Jan-01 Job ID: 9015 RBCATool Kit for Chemical Releases, Version 1.2 Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Bakersfield,CA. CUMULATIVE RISK WORKSHEET Completed By: Soils Engineering,Inc. Date Completed: 10-Jan-01 Cumulative Risk Worksheet Job ID: 9015 1 OF3 CONSTITUENTS OF CONCERN Representative Concentration Soil Groundwater CAS No. Name (mgJkg) (rng/L) 1330-20-7 Xylene (mixed isomers) 2.5E+2 108-88-3 Toluene 5.7E+1 100-41-4 Ethylbenzene 3.6E+1 71-43-2 Benzene 3.4E+0 91-20-3 Naphthalene 1.7E+1 Proposed CRF Soil GW <1 <1 <1 .2E+O <1 Resultant Target Concentration Soil Groundwater (rog/kg) (rng/L) 2.5E+2 5.7E+1 3.6E+1 2.7E+0 1.7E+1 Cumulative Values: RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Bakersfield,CA Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Bakersfield,CA. Completed By: Soils Engineering,Inc. Date Completed: lO-Jan-01 Cumulative Risk Worksheet Job ID: 9015 2 OF3 CUMULATIVE RISK WORKSHEET Cumulative Target Risk: 1.0E-5 Targel Hazard Index: 1.0E+0 ON-SITE RECEPTORS Outdoor Air Exposure: Indoor Air Exposure: Soil Exposure: Groundwater Exposure: Commercial None Commercial Commercial Target Risk: Target HQ: Target Risk: Target HQ: Target Risk: Target HQ: Target Risk: Target HQ: CONSTITUENTS OF CONCERN 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+O Carcinogenic Hazard Carcinogenic Hazard Carcinogenic Hazard Carcinogenic Hazard CAS No. Name Risk Quotient Risk Quotient Risk Quotient Risk Quotient 1330-20-7 Xylene (mixed isomers) 3.8E-4 3,9E-3 0.0E+0 108-88-3 Toluene 2.0E-3 1.0E-2 0.0E+0 100-41-4 Ethylbenzene 3.4E-4 1.1E-2 0.0E+0 71-43-2 Benzene 1.6E-7 8.9E-3 8.4E-7 2.6E-2 0.0E+0 0.0E+0 91-20-3 Naphthalene 1.1E-5 1.6E-4 0.0E+0 Cumulat/veValues: 1.6E-7 I 1.2E-2 I O.OE+O I O.OE+O I 8.4E-7 I S.~E-2 I O.OE+O I O.OE+O I · Indicates risk level exceeding target risk RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Bakersfield,CA. Site Name: SchwebelPetroleum Company Site Location: 900 Sacramento St., Bakersfield,CA. Completed By: Soils Engineering,Inc. Date Completed: 10-Jan-01 Cumulative Risk Worksheet Job ID: 9015 30F3 CUMULATIVE RISK WORKSHEET Cumulative Target Risk: 1.0E-5 Target Hazard Index: 1.0E+0 Groundwater DAF Option: Domenico - First Order OFF-SITE RECEPTORS Outdoor Air Exposure: Groundwater Exposure: Commercial (t 00 fi) None Commercial (0 fi) None Target Risk: Target HQ: Target Risk: Target HQ: Target Risk: Target HQ: Target Risk: Target HQ: CONSTITUENTS OF CONCERN 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 Name Carcinogenic Hazard Carcinogenic Hazard Carcinogenic Hazard Carcinogenic Hazard CAS No. Risk Quotient Risk Quotient Risk Quotient Risk Quotient 1330-20-7 Xylene (mixed isomers) 2.3E-4 0.0E+0 108-88-3 Toluene 1.2E-3 0.0E+0 100-41-4 Ethylbenzene 2.1E-4 0.0E+0 71-43-2 Benzene 9.4E-8 5.3E-3 0.0E+0 0.0E+0 91-20-3 Naphtha ene 6.8E-6 0.0E+0 Cumula~iveValues:l 9.4E-8 I ?.oE-3 I o.oE, o I o.o +o I o.o +o I o.oE,o I O.O ,O I o.oE+o I · Indicates risk level exceeding target risk RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: SchwebelPetroleum Company Completed By: Soils Engineering,Inc. Site Location: 900 Sacramento St., Bakersfield,CA. Date Completed: 10-Jan-01 1 of' TIER 2 BASELINE RISK SUMMARY TABLE BASELINE CARCINOGENIC RISK BASELINE TOXIC EFFECTS Individual COC Risk Cumulative COC Risk Risk Hazard Quotient Hazard Index Toxicity PATHWAY Value Risk Value Risk Exceeded? Value Limit Value Limit Exceeded? OUTDOOR AIR EXPOSURE PA THWA YS Complete:[ 1.9E-711.0E-6 1.9E-7 1.0E-5I [] I~.,,I,.0~+0 [] INDOOR AIR EXPOSURE PA THWA YS Complete: INAI NA NA NAI [] INAI NA NAI NA [ [] SOIL EXPOSURE PA THWA YS Complete:l 1.0E-6[ 1.0E-6 1.0E-6 1.0E-5 [ m I~.=,1,.0~+0 [] GROUNDWATER EXPOSURE PA THWA YS Complete: I NC [ 1.0E-6 NC 1.0E-5 I [] I NC 1.0E+0 NC I 1.0E+0 [] SURFACE WA TER EXPOSURE PA THWA YS CRITICAL EXPOSURE PATHWAY (Maximum Values From Complete Pathways) ,.0~.~ I ,.0~-~ ,.0~.~ I ,.0~.~ · ~o~.~ I ,o0~.0 ~.~.~ I ,.0~0 [] Soil Soil Outdoor Air Soil RBCA Toc4 t~t for Che~cal Releases, Version 1.2 Site Name: SchwebelPe~oleum Company Site Locatlor~: 900 Sacramento St.. Bakersfleld~CA. SOIL (20 - 65 ft) SSTL VALUES Completed By: So{Is Engineering, Inc. Date Completed: lO-Jan-Q1 Targa{ Risk (Class A & B) 1.0E-6 Tm'ge{ Ri~k (C~ass C) 1.0E-5 Target Haaard Quotler~ 1.0E+0 Job ID: 9015 Grotm<N~ter DAF Ol~ion: Domenico- First Order (One-drestionaf ve~t. dsperstm) 10F1 Ingestion Indoor Air X Soil Volatl~a~on to Outdoor Air X Required CRF tnqe~qn,IDen~l Ceata~ Ap~cst~ SSTL Representative On-site Off-site I Off-site 2 On-site Off-site 1 Off-sits 2 SSTL Exceeded ? CONSTITUENTS OF, CONCERN Concentration (0 fl) (100 R) (0 fi) (0 fi) On-site (0 fi) (100 R1 (0 Rt On-site (0 fi) Only If'yes' CAS NO. Name (rog/kg) Commercial Commercial None None Co~merclal Construction Construction ~eft WonV. er Commarcia! None Coca'natural We~ker (mg'~l) 'a' if yes 1330-20-7 Xytene (mixed Isomers) 2.5E+2 >5.1E+2 >5.1E+2 NA NA >5.1E+2 >5.1E+2 ,>5.1E+2 NA 5.8E+4 5.9E+4 5.8E+4 [] <1 108-88-3 Toluene 5.7E+1 >7.9E+2 >7.gE+2 NA NA >7.9E+2 >7.9E+2 >7.9E+2 NA 4.6E+3 3,8E+3 3.8E+3 [] <1 100-41-4 Ethylbenzene 3.6E+1 >6.4E+2 >6.4E+2 NA NA >6.4E+2 >6.4E+2 >6.4E~-2 NA 3.3E+3 4.0E+3 3.3E+3 [] <1 71-43-2 Benzene 3.4E+0 >1.3E+3 >1.3E+3 NA NA ,~.8E+1 8.6E+1 2.9E+1 NA 2.7E+0 5.3E+1 2.7E+0 · 1,2E+0 91-20-3 Naphthalene 1.7E+1 >6.2E+2 >6.2E+2 NA NA >6.2E+2 >6.2E+2 >6.2E+2 NA 1.0E+5 1.0E+5 1,0E+5 [] <1 · >" indicates ris~-based target concenlratton ~'eater ttmn constttuent residual saturation value. NA = Not applicable. NC = Not calculated. I I I I I I I ! I, I I I I I I I I I I m Z X ! I I I I I I I I I I I I I I SOILS ENGINEERING, INC. Appendix B RBCA TOOL KIT CALCULATIONS (Without Biodecay) d Main Screen RBCA Tool Kit for Chemical Releases, Version 1.2 RBCA Tool Kit for Chemical Releases Version 1.2 © 1999 1. Project Information Site Name: Schwebel Petroleum (without biodecay) Location: 900 Sacramento St, Bakersfield, CA. Compl. By: SEI Date: 10-Jan-01 I Job ID:]9015 2. Which Type of RBCA Analysis? (~) 1 Generic Values Site-Specific Values On-Site On- or Off-Site Exposure Exposure 3. Calculation Options Affects which input data are required ~ Baseline Risks (Fo~ard mode) ~ RBCA Cleanup Standards (Bac~ard mode) 4. RBCA Evaluation Process "Prepare Input Data ....... ! i ........ Review Output !(an Exposure Pathways I I ~=~~ Data Complete? ( · yes, anD) Constituents of · il CDC Chem. Parameters · [] Concern (COCs) r.,( Input Data Summary · [] Soil ~aramet~m · [] GW Parameters i i Baseline Risks... ( · [] Air Parameters ....... i ..... Cleanup Standards... 5. Commands and Options .aw s.e )d =a=... Print Sheet ~ Set Units d n~ lu lU Z Z 0 RBCA Tool Kit for Chemical Releases, Version 1.2 Exposure Pathway Identification 1. Groundwater Exposure . ,,~.~.~; ,.... Source Media: [] Affected Groundwater [] Affected Soils Leaching to Groundwater Groundwater Ingestion/ Surface Water Impact Receptor Com. - Corn. - None I'~ Type: On-site I[ Off-site1J Off-site2 Distance to GW receptors Off-site1 100 [': ,,:~:;Enter;ALP' criteria' ) 2. Surface Soil Exposure Direct Ingestion ? and Dermal Contact Receptor ~ No off-site ~~ Type: On-site receptors Construction Worker [] 3. Air Exposure Receptor Type: Volatilization and Particulates to Outdoor Air Inhalation Construction worker Corn. Off-site1 100 None '~' I Off-site2 I ,'.-,' [] Affected Soils--Volatilization to Ambient Outdoor Air [] Affected Groundwater-Volatilization to Ambient Outdoor Air [] Affected Surface Soils-Particulates to Ambient Outdoor Air Volatilization to Indoor Air Inhalation Receptor J None J-- J No off-site Type: J On-site J receptors 4. Commands and Options ~ Main Scree Print Sheet Set Units ::..~ · [] Exposure Fa,ors & T arg~e..t2is~ks~~~ RBCA Tool Kit for Chemical Releases, Version 1.2 Transport Modeling Options 1. Vertical Transport, Surface Soil Column OutdoorAirVolatilizationFactors O Surface soil volatilization model only ~) Combination surface soil/Johnson & Ettinger models Thickness of surface soil zone O User-specified VF from other model O ,t' ,,. , ..... [i." . Enter VF Values Soil-to-Groundwater Leachin~ Factor ~) ASTM Model [] Apply Soil Attenuation Model (SAM) [] Allow first-order biodecay O User-specified LF from other model 2. Lateral Air Dispersion Factor Wind ~) 3-D Gaussian dispersion model Off-site 1 Off-site O User-Specified ADF J ~.00E+0 I I ~.00E+0 I~-) 0 0 Enter Directly ) Calculate DAF using Domenico Model Domenico equation with dispersion only (no biodegradation) Domenico equation first-order decay Modified Domenico equation using electron acceptor superposition ~ or~ User. Specified DAF Values DAF values from other model (.~ i.. or site data 4. Commands a~d Options RBCA Tool Kit for Chemical Releases, Version 1.2 Site-Specific Soil Parameters 1. Soil Source Zone Characteristics Hydrogeology Depth to water-bearing unit Capillary zone thickness Soil column thickness Affected Soil Zone Depth to top of affected soils Depth to base of affected soils Affected soil area Length of affected soil parallel to assumed wind direction Length of affected soil parallel to assumed GW flow direction General Case Construction 20 65 4500 II 4500 I(ft^2) I 40 o umn Predominant USCS Soil Type or ~' Enter Directly Total porosity Volumetric water content Volumetric air content Dry bulk density Vertical hydraulic conductivity Vapor permeability Capillary zone thickness Net Rainfall Infiltration Net infiltration estimate or ( Enter Directly Average annual precipitation Partitioning Parameters Fraction organic carbon Soil/water pH Vadose Zone Capillary Fringe ML: Sandy Silt J--J or (-) (-) (-) (kg/L) (ft/yr) (fl^2) (fl) (in/yr) or 6 (in/yr) 0.01 3. Commands and Options J~( Main Screen ]~j; ..... ~ Pnnt Sheet ~J t~ ~ ~. ~.,~] use uetaun m~ ............ ~1 .~" ~ values ~. J~ Set Units )~[ ~ ~ Help "' ~ RBCA Tool Kit for Chemical Releases, Version 1.2 Site-Specific Groundwater Parameters 1. Water-Bearing Unit Hydrogeology Groundwater Darcy velocity Groundwater seepage velocity or ~ Enter Directly ) Hydraulic conductivity Hydraulic gradient Effective porosity Sorption Fraction organic carbon-saturated zone Groundwater pH 2. Groundwater Source Zone Groundwater plume width at source Plume (mixing zone) thickness at source or ( Calculate .~ 8.2E+3 1.0E-2 0.38 0.001 6.20 (-) 147.6377953 I(ft) 6.56167979 J(ft) S Model: I ASTN Default Distance to GW receptors or ~ Enter Directly Longitudinal dispersivity Transverse dispersivity Vertical dispersivity GW Ingestion Soil Leaching to GW Off-site 1 ~~(~) 5. Commands and Options Main ~cr~en ..~- Use Default ...... ~,~:~ .....~/ Values [~- :" :~-: Set Un,ts ]~~ Help m m m mm m m m m mm m m mm m mm m m m m m RBCA Tool Kit for Chemical Releases, Version 1.2 Input Parameter Summary Site Name: S~bel Pe~'oleum (without bi=decay) Site Loca~on: 900 Sacramento St, Bakersfield, CA. Completed By: SEI Job ID: 9015 Date Completed: lO.Jan-01 f OF f Exposure parec~etem Residential CommeralaYlnduetrial Adu~ H-~wt) H-16WC) Chronic ATe Averaging time for carcinogens (yr) 70 AT, Averaging lime for non-carcinogens (yr) 30 25 1 Sw ~ Walgh~ (kg) 70 15 35 70 ED E3~3osurs ~t~'ltlon (yr) 30 0 18 25 1 '~ Averaging Um~ for vapor fl~( (yr)30 25 1 EF Exposure fmqJency (deys/yr) 350 250 180 EFt) F_~osure frequency for dermal e~cura 350 250 IR~ Inge~tlan rata of water (L/day) 2 1 IR~ Ingectlon rate of soil (mo/day) 100 200 50 100 SA Sldn surfaca area (den'aal) (om^2)5800 2023 5800 5600 M Soil to aldn a~srenoe factor ET,,~a Swimming exposure time (hr/event) 3 EV~mm ~/Immlng event frequency (events/yr)12 12 12 IR~,. Water Ingeallon mile swimming (L/hr)0.05 0.5 ~ Sxin surface area for ~mrnlng (cn~2) 23000 8100 IRnm Ingeslion rate of fish (kg~yr) 0.025 Fl.,,n Contaminated fish fraction (unltlecc) I Complete Exposure Fattwmy. and Receptors Or~ite Off-alta t ~EI 2 ~ter In~i~ None Nons None Soil Lea~ng to G~tar In~l~ Co~e~oi Commemial None ~pac~le 8u~e W~r Ex~lurc Ro~el: Fish ~on ~ ~allc Ufa Pr~e~i~ ~ DI~ I~lon and ~I Co~a~ C~JCon~r. O~cor ~: Pa~l~tes ~ ~ca Soils C~JCcostr. Co~al None V~ion ~ ~itS C~.~co~r. Co~er~ai None V~I~ ff~ S~ce Soils None ~ ~ V~tl~tl~ ~ ~ter None ~ ~ Receptor Distance from Source Media On-alta Off-site 1Off-airs 2(Uni~), , I Grc~ndwatar receptor I NA NA NA (it) I Soilleachlng to groundwater receptor I 0 100 NA (it) I Outdo~ air Inhalation receptor 0 100 NA (it) I Tm'gal Health Risk Values Individual Cumulative TR~ Target Risk (oiass A&B carcinogens) TR~ T~,rget Risk (oiass C caminogens} I 1,QE-5 THQ Target Hazard Quctlect (non-camlnogenic risk) 1.0E+0 1.0E+0 Modeang Op~lonl RBCA tier Tie~ 2 Outdco~ elf vc~tl~mt~on modet Sun. ca & subsuKa~e mod~s Indoor sir vofaUl~eaUon model NA Sctlleachlng model AS'rM leeching model Use coil itt snuatlon model (SAM) for lecchate? Yes Air,'~tutlco factor 3-D Gausslan clsps~co Groundwater ctlutlon-alt snuallon factorDomenico model wi btodeg. NOTE: NA = Not N:g~tcable , Surface perametem ~.neral ConetnJctfon ~nt~) A Source zone ama 4.5E+3 4.5E+3 (it~2) W Length of ecuroe-~s area psmllel to wind 1.1E+2 1.1E+2 (11) Wow Langt h of ~,,urce-a3ca area psmdoi to GW flow 4.0E+1 (~) U~. Ambient air velocity In mixing ~3ns 2.3E+8 (frh/r) ~r .Nr rnlxing sons height 8.6E<.0 (it) Pm Nell padlculale emission rate 6.9E-14 (g/crn~2/s) L. Thickness of effected surface soils 2.0E+1 (it) Surface Scsi Celumn Faremetarl Value (Units) f~ Fm~J~ o~c ca~n 1.0E-2 (-) 8~ SOIl t~al ~mcity 4.3E-1 (-) ~ Ve~ical hy~u~c con~Mt~ 1.0E+1 (~) ~ Va~r ~ea~ty 1.1E-14 (~2) L~ De~ to ~un~ter 2.2E+2 (fi) L~ De~ to t~ of affe~ed ~ 2.0E+1 (~) L~. De~ to ~sa ~ effaced soils 6.5E+1 (R) L~ ~ic~ecs of life,ed s~ls 4.5E+1 (a) ~ ~lEff~ter ~ 8.8E~ (-) ~ V~dc ~ter ~e~ 0.387 0.26 0.12 (-) ee Vo~metdc air co~e~ 0.043 0.17 0.26 (-) Buildlr~l Parametem Realdentlal Commercial ~Jnl~) L= Bulldng volume/area ratio NA NA (It) ~ Foundation area NA NA (cs*2) X~r~ Foundation podmetar NA NA (fi) ER ~uttdng air exchange rate NA NA ( 1/yr) L=r~ Foundation thickness NA NA (it) Z=r~ Depth to bottom of foundation slab NA NA (it) q Foundation crock fraction NA NA (-) dP Indoor/outdoor clfferential pressure NA NA (psi) Q, Convective air flow throu~ Uab NA NA (it*3/yq Groundwater parameters Value i~nttl) &g. Groundwater mixing ~ona depth 8.6E+0 (it) I~ Net groundwater infiltration ate 8.2E-2 (in/yr) Ug~ Gro<Jndv~ter Darcy velocity 8.2E+1 (ft/yr) V~, Groundwalar seepage velocity 2.2E+2 (frhyr) K~ Saturaled hyd'aulic conductivity8.2E+3 tlt/yr) I Groundwater gradent 1.0E-2 (-) S. Wlcth of groundwater source zone1.5 E+2 (It) So Depth of groundwater source zone6.8E*4:) (it) ee~ Effective porosity in water-besting t~t 3.8E-1 (-) fo,.sa Fraction organic carbon in Waler-beadng unit 1.0E-3 (*) PHsat Grcundwatar pH 6.2E.H3 (-) ~iodegradatl~ cor~sidered? 1~ Order Transpod Parametarl Off-alta 1 Off.lite 2 Off-sIte 1 Off..~ite 2 OJnlta) ~. Longitt~lnat d~:)emivity NA NA 1.0E+1 NA (it) o~ Transverse dspercivlty NA NA 3.3E+0 NA (It) az Varfloel dspsrsivtty NA NA 5.0E-t NA (It) oy Transvems dspsmion coefficient 1.1E+1 NA NA NA (It) Cz Ymtical (~speraion coefficient 7.6E+0 NA NA NA (it) ^DF .Nr dspsrclon factor 1.6E+0 NA NA NA (-) Surface Water Paremetera Off~lte 2 VVl~th of GW plume at SW dscharge Thloimecs of GW plume at ~N dscharge mNA NA (it) N~ DF~ Greedy, stem'-to-curt'ice water dlulion factor d RBCA Tool Kit for Chemical Releases, Version 1.2 Source Media Constituents of Concern (COCs) Selected COCs coc Select: sort Dst: Add/Insert ~ ~ ~'-~oveU--~- Delete ~ ~ ~MoveDown) · :'. Calculate Representative .COC '/ ( ~ Enter Site Data Concentration Soil Source Zone Calculate 1 ( '" i::': Enter Site Data: (mg/kg) note 1.1E+1 2.5E+2 5.7E+1 3.6E+1 3.4E+0 Help -I Apply Raoult's Law ~ RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: Schwebel Petroleum Site Location: Baseline Risk Summary-All Pathways J Completed By: Date Completed: 0-Jan-00 1 of' TIER 2 BASELINE RISK SUMMARY TABLE BASELINE I IndlviduallcOo RIsk EXPOSURE Maximum Target PATHWAY Value Risk CARCINOGENIC RISK Cumulative COC Risk Total I Target Value Risk Risk Limit(s) Exceeded? IOUTDOOR AIR EXPOSURE PA THWA YS Complete:I 1.2E-7I 1.0E-6 BASELINE TOXIC EFFECTS Hazard Quotient Hazard Index I Toxicity Value Limit Value Limit Exceeded? 1.2E-7I 1.0E-5I I 6.8E-3 I 1.0E+0 8.0E-3I 1.0E+0I NDOOR AIR EXPOSURE PA THWA YS I Complete: I NA NA SOIL EXPOSURE PA THWA YS NA NA NA I NA I [] ~ROUNDWA TER EXPOSURE PA THWA YS I3.3E-2 1.0E+0I 5.8E-2 [ 1.0E+0 SURFACE WATER EXPOSURE PA THWA YS I1.7E-3 1.0E+0I 2.0E-3I 1.0E+0 ll]f'OE'6 f. OE-6 f. OE-6 f. OE.5 [] Soil Soil INA 3.3E-2 I f. OE+O Soil J 5.8E-2 I 'i. OE+O Soil m mm m m m m m m m m m m m m m m -m m m RBCA Tool Kit for Chemical Releases, Version 1.2 Cumulative Risk Worksheet Site Name: Schwebel Petroleum Completed By: Job ID: Site Location: Date Completed: O-Jan-00 1 OF 3 CUMULATIVE RISK WORKSHEET CONSTITUENTS OF CONCERN Representative Concentration Soil Groundwater CAS No. Name (rog/kg) (mg/L) 1330-20-7 Xylene (mixed isomers) 2.5E+2 108-88-3 Toluene 5.7E+1 71-43-2 Benzene 3.4E+0 100-41-4 Ethylbenzene 3.6E+1 91-20-3 Naphthalene 1.1 E+ 1 Proposed CRF Soil GW <1 <1 1.0E+0 <1 <1 Resultant Target Concentration Soil Groundwater (mg/k;) (rnQ/L) 2.5E+2 5.7E+1 3.2E+0 3.6E+1 1.1E+1 Cumulative Values: RBCA Tool Kit for Chemical Releases. Version 1.2 Cumulative Risk Worksheet Site Name: Schwebel Petroleum Site Name: Schwebel Petroleum Completed By: Job ID: Site Location: Site Location: Date Completed: 0-Jan-00 2 OF 3 CUMULATIVE RISK WORKSHEET Cumulative Target Risk: 1.0E-5 Target Hazard Index: 1.0E+0 ON-SITE RECEPTORS Outdoor Air Exposure: Indoor Air Exposure: Soil Exposure: Groundwater Exposure: Commercial None Commercial Commercial Target Risk: Target HQ: Target Risk: Target HQ: Target Risk: Target HQ: Target Risk: Target HQ: CONSTITUENTS OF CONCERN 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 Carcinogenic Hazard Carcinogenic Hazard Carcinogenic Hazard Carcinogenic Hazard CAS No. Name Risk Quotient Risk Quotient Risk Quotient Risk Quotient 1330-20-7 Xylene (mixed isomers) 1.3E-4 3.9E-3 5.4E-5 108-88-3 Toluene 9.3E-4 1.0E-2 2,1E-4 71-43-2 Benzene 1,1E-7 6.5E-3 1,0E-6 3.1E-2 4.9E-8 1.6E-3 100-41-4 Ethylbenzene 1.0E-4 1.1E-2 1.1E-4 191-20-3 Naphthalene 2.0E-7 9.7E-5 1.5E-6 Cumulet/veVelues: 1.1E-7 I 7.7E-3 I O.OE+O I O.OE+O I ~.OE-6 I S.SE-2 I 4.9E-S I 2.0E-3 I · Indicates risk level exceeding target risk RBCA Tool Kit for Chemical Releases, Version 1.2 Cumulative Risk Worksheet Site Name: Schwebel Petroleum Site Name: Schwebel Petroleum Completed By: Job ID: Site Location: Site Location: Date Completed: 0-Jan-O0 3 OF 3 CUMULATIVE RISK WORKSHEET Cumulative Target Risk: 1.0E-5 Target Hazard Index: 1.0E+0 Groundwater DAF Option: Domenico - First Order OFF-SITE RECEPTORS Outdoor Air Exposure: Groundwater Exposure: Commercial (t 00 fi) None Commercial (0 ft) None Target Risk: Target HQ: Target Risk: Target HQ: Target Risk: Target HQ: Target Risk: Target HQ: CONSTITUENTS OF CONCERN 1.0E-6 / 1.0E-5 1.0E+O 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 1.0E+0 1.0E-6 / 1.0E-5 '1.0E+O Carcinogenic Hazard Carcinogenic Hazard Carcinogenic Hazard Carcinogenic Hazard CAS No. Name Risk Quotient Risk Quotient Risk Quotient Risk Quotient 1330-20-7 Xylene (mixed isomers) 7.9E-5 1.4E-5 108-88-3 Toluene 5.6E-4 1.0E-6 71-43-2 Benzene 6.9E-8 3.9E-3 2.0E-8 6.3E-4 100-41-4 Ethylbenzene 6.3E-5 1.5E-5 91-20-3 Naphthalene 1.2E-7 2,4E-8 Cumulative Values: 6.9E-8 I 4.6E-3 I O.OE+O J O.OE+O I 2.0E-8 I 6.6E-4 I O.OE+O I O. OE+O Indicates risk level exceeding target risk RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: Schwebel Petroleum Tier 2 Domenico Groundwater Modeling Summary Site Location: Completed B~: Date Completed: 0-Jan-00 I OF 2 DOMENICO GROUNDWATER MODELING SUMMARY IOFF-SITE GROUNDWATER EXPOSURE PATHWAYS · (CHECKED IF PATHWAY IS ACTIVE) SOILS (20 - GE ft): LEACHING TO Exposure Concentration GROUNDWATER INGESTION 1) Source Medium 2) Steady-state Exposure Concentration 3) POE Concentration Limit 4) Time to Reach POE Conc. Limit Groundwater: POE Conc. (m~/L) Groundwater: POE Conc. (rog/L) Conc. limit reached? ("la" if yes); Time (yr) Off-site 1 Off-site 2 Off-site 1 Off-site 2 Off-site 1 Off-site 2 Soil Conc. (100 fi) (0 fi) (100 It) (0 It) (100 fi) (0 ft) Constituents of Concern (rr~/k~) Commercial None Commercial None Commercial None Xylene (mixed isomers) 2.5E+2 2.9E-3 2.0E+2 [] NA NA Toluene 5.7E+1 2.1E-5 2.0E+1 [] NA NA Benzene 3.4E+0 2.0E-4 9.9E-3 [] NA NA Ethylbenzene 3.6E+1 1.6E-4 1.0E+1 [] NA NA Naphthalene 1.1E+1 1.0E-6 4.1E+1 [] NA NA NOTE: POE = Point of exposure RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: Schwebel Petroleum Tier 2 Domenico Groundwater Modeling Summary Site Location: Completed By: Date Completed: 0-Jan-00 2 OF 2 DOMENICO GROUNDWATER MODELING SUMMARY [OFF-SITE GROUNDWATER EXPOSURE PATHWAYS [] (CHECKED IF PATHWAY IS ACTIVE) OROUNDWATER: INGESTION Exposure Conoen~z~on 1) Soume Medium 2) Steady-state Exposure Concentration 3) POE Concentration Limit 4) Time to Reach POE Conc, Limit Groundwater: POE Conc, (m~/L) Groundwater: POE Conc. (rog/L) Cone reaches limit? ("'"' If yes); Time (yr) Off-site I Off-site 2 Off-site 1 Off-site 2 Off-site I Off-site 2 Groundwater (0 It) (0 It) (0 It) (0 It) (0 fi) (0 It) Constituents of Concern Conc. (rng/L) None None None None None None Xylene (mixed isomers) NA NA Toluene NA NA Benzene NA NA Ethylbenzene NA NA Naphthalene NA NA NOTE: POE = Point of exposure RBCA Tool Kit for Chemical Releases, Version 1.0 Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 JoblD: 1 of 5 Constluent: Source Medium: BIodegredatlon: Xylene (mixed isomers) Affected Soils Leaching to Groundwater 1st Order Concentration vs. Distance from Source Time (yr)I 2.0 I (for given time) Distance (ft) 0 10 20 30 40 50 60 70 80 90 100 t -- 2.0 yr I~ ~ A 1.1 E-2 1.0E-2 9.7E-3 8.8E-3 7.7E-3 6.5E-3 5.5E-3 4.6E-3 3.9E-3 3.3E-3 2.8E-3 Steady-state 18 ~ 1.1E-2 1.0E-2 9.7E-3 8.8E-3 7.7E-3 6.5E-3 5.5E-3 4.6E-3 3.9E-3 3,3E-3 2,9E-3 2,0E-2 1.5E-2 '-' 1.0E-2 o o §.0£-$ 0.0E+0 POE Concentration Limit (mg/L) Off-site1 Off-site2 Commercial None 100 NA 2.8E-3 NA 2.9E-3 NA 2.0E+2 NA 0 10 20 30 40 Disr:~ce 60 70 80 90 100 · , Steady-state · , t= 2.0yr - - I! - .Off-site1 Conc. Limit - - -I- -. Off-site2 Conc. Limit Concentration vs. Time Distance (ft) (for given distance from source) Time (yr) 0 3 6 9 12 15 18 21 24 27 30 x = 50 ft d ~' 0.0E+0 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 , Off-site1 (100 It) ~ E~ 0.0E+0 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 ~ Oil-site2 (0 It) v NA NA NA NA NA NA NA NA NA NA NA 7.0E-3 6.0E-3 5.0E-3 4.0E-3 3.0E-3 2,0E-3 1.0E-3 0.0E+0 ~ 0 [] 0 0 O ,. 10 Tim%5(yr) 20 25 Time to Reach Conc. Limit (yr) Off-site1 I NA Off-site2 NA -.-O--- x = 50 ff -- Off-site1 (100 fi) ~ , Off-site2 (0 ft) - - lB- - .Off-site1 Conc. Limit - - -I.- -. Off-site2 Conc. Limit lmm m m m m m m mm m m mm mm m m m m lmm m. mm RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Job ID: 1 of 5 Constluent: Source Medium: Biod~redatlon: Xylene (mixed isomers) Affected Soils Leaching to Groundwater 1st Order Concentration vs. Distance from Source Time (yr)r~-~'] (for given time) Distance (ft) 0 10 20 30 40 50 60 70 80 90 100 t = 2.0 yr ,,, IL E~ 1.1E-2 1.0E-2 9.7E-3 8.8E-3 7.7E-3 6.5E-3 5.5E-3 4.6E-3 3.9E-3 3.3E-3 2.8E-3 Steady-state (~ ~ A 1.1E-2 1.0E-2 9.7E-3 8.8E-3 7.7E-3 6.5E-3 5.5E-3 4.6E-3 3.9Eo3 3.3E-3 2,9E-3 POE Concentration Limit (mg/L] 2,0E-2 1.5E-2 E '-' 1.0E-2 d O ~ 5.0E-3 0.0E+0 0 10 20 30 40 D is~ce 60 70 80 90 Off-site1 Off-site2 Commercial None 100 NA 2.8E-3 NA 2.9E-3 NA 2.0E+2 NA Steady-state t = 2.0yr .Off-site1 Conc. Limit Off-site2 Conc. L mit 100 Concentration vs, Time Distance (ft)r~~ (for given distance from source) Time (yr) 0 3 6 9 12 15 18 21 24 27 30 x = 50 ft d ~' O.0E+0 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 6.5E-3 Oil-site1 (100 ~t) ~ '~ O.0E+O 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 2.9E-3 Off-s~e2 (0 ~) NA NA NA NA NA NA NA NA NA NA NA 7.0E-3 6.0E-3 5.0E-3 4.0E-3 3.0E-3 2.0E-3 1.0E-3 0.0E+0 [] [] [] [] ~ , 10 Timl~(yr) 20 25 30 Time to Reach Conc. Limit (yr) Off-site1 I NA Off-site2 NA "'"C]"- x = 50 ff -- Off-site1 (100 ft) O Off-site2 (0 ft) - - ~ - .Off-site1 Conc. Limit · !-- .Off-site2 Conc. Limit RBCA ToorKit for Chemical Releases, Version 1.2 Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Constluent: Source Medium: Blode~lredaflon: Toluene Affected Soils Leaching to Groundwater 1st Order Job ID: 2 of 5 Concentration vs. Distance from Source Time (yr)I 2.0 (for given time) Distance (ft) 0 10 20 30 40 50 60 70 80 90 100 t = 2.0 yr I~d ~ ~ 4.3E-3 2.3E-3 1.3E-3 7.4E-4 4.3E-4 2.4E-4 1.4E-4 8.5E-5 5.2E-5 3.3E-5 2.1E-5 Steady-state 18 E~ 4.3E-3 2.3E-3 1.3E-3 7.4E-4 4.3E-4 2.4E-4 1.4E-4 8.5E-5 5.2E-5 3.3E-5 2.1E-5 5.0E-3 4.0E-3 3.0E-3 d 2.0E-3 O 1.0E-3 POE Concentration Limit (mg/L) Off-site1 Off-site2 Commercial None 100 NA 2.1E-5 NA 2.1E-5 NA 2.0E+1 NA 0.0E+0 0 10 20 30 40 Dis~hce 60 70 80 90 100 ~ Steady-state 4, t = 2.0yr - - Er - .Off-site1 Conc. Limit - - -!- - .Off-site2 Conc. Limit Concentration vs. Time Distance (ft)~-~'~ (for given distance from source) Time (yr) 0 3 6 9 12 15 18 21 24 27 30 x-- 50 ft d ~' 0.0E+0 2.4E-4 2.4E-4 2.4E-4 2.4E-4 2.4E-4 2.4E-4 2.4E-4 2.4E-4 2.4E-4 2.4E-4 Off-s~el (100 It) ~ ~ O.0E+0 2.1E-5 2.1E-5 2.1E-5 2.1E-5 2.1E-5 2.1E-5 2.1E-5 2.1E-5 2.1E-5 2.1E-5 Off-site2 (0 It) NA NA NA NA NA NA NA NA NA NA NA 3.0E-4 2.5E-4 ~ 2.0E-4 --' 1.5E-4 d o 1.0E-4 5.0E-5 0.0E+0 0 n [] [] [] 0==-.===-.~0 [] I 5 10 Tim~=(yr) 20 25 30 Time to Reach Conc. Limit (yr) Off-site1 I NA Off-site2 NA '~O--- x= 50ff -- Off-site1 (100 ft) ~ Off-site2 (0 ft) · - Er - .Off-site1 Conc. Limit - - -I- - .Off-ste2 Conc. L mit m m m m m m m mm m m m m m m m m m m ,-- RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Constluent: Source Medium: Blode~lredatlon: Benzene Affected Soils Leaching to Groundwater 1st Order Job ID: 3 of 5 Concentration vs. Distance from Source Time (yr)I 2.0 I (for given time) Distance (ft) 0 10 20 30 40 50 60 70 80 90 100 t-- 2.0 yr I~E~A 5.1E-4 5.0E-4 4.9E-4 4.7E-4 4.2E-4 3.7E-4 3.3E-4 2.9E-4 2.5E-4 2.3E-4 2.0E-4 Steady-state ~ 5.1E-4 5.0E-4 4.9E-4 4.7E-4 4.2E-4 3.7E-4 3.3E-4 2.9E-4 2.5E-4 2.3E-4 2.0E-4 6.0E-4 5.0E-4 ~ 4.0E-4 ~ 3,0E-4 ~ 2.0E-4 1.0E-4 O.OE+O .'. ,-, A POE Concentration Limit (mg/L) Off-site1 Off-site2 Commercial None 100 NA 2.0E-4 NA 2.0E-4 NA 9.9E-3 NA 0 10 20 30 40 Dis~i:hce 60 70 80 90 100 ¢, Steady-state J. t -- 2.0 yr - - I~ - .Off-site1 Conc. Limit - - -P - .Off-site2 Conc. Limit Concentration vs. Time Distance (ft)F'~'~ (for given distance from source) Time {yr) 0 3 6 9 12 15 18 21 24 27 30 ~ O.0E+O 3.7E-4 3,7E-4 3.7E-4 3.7E-4 3.7E-4 3.7E-4 3.7E-4 3.7E-4 3.7E-4 3.7E-4 ×-- 50 ft cd , Off-site1 (100 It) C~ ~ 0.0E+0 2.0E-4 2.0E-4 2.0E-4 2.0E-4 2.0E-4 2.0Eo4 2.0E-4 2.0E-4 2.0E-4 2.0E-4 Off-site2 (0 It) NA NA NA NA NA NA NA NA NA NA NA 4.0E-4 3.5E-4 3.0E-4 2.5E-4 2,0E-4 1.5E-4 1.0E-4 5.0E-5 O.OE+0 10 Tim'l~(yr) 20 25 Time to Reach Conc. Limit (yr) Off-site1 I NA Off-site2 NA -~O--"- x = 50 ft --- Off-site1 (100 It) ---~---Off-site2 (0 ft) - - ~ - .Off-site1 Conc. Llmit - - -I- - .Off-site2 Conc. Limit RBCA Tool Kit for Chemical Releases, Version 1.2 Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Job ID: 4 of 5 Constluent: Source Medium: Blode~lredation: Ethylbenzene Affected Soils Leaching to Groundwater 1st Order Concentration vs. Distance from Source Time (yr)I 2.0 (for given time) Distance (fi} 0 10 20 30 40 50 60 70 80 90 100 t=2.0yr I~A 1.1E-3 9.5E-4 8.3E-4 7.1E-4 5.8E-4 4.6E-4 3.7E-4 2.9E-4 2.4E-4 1.9E-4 1.5E-4 Steady-stateI~E v 1.1 E-3 9.5E-4 8.3E-4 7.1E-4 5.8E-4 4.6E-4 3.7E-4 3.0E-4 2.4E-4 1.9E-4 1.6E-4 2.0E-3 1.5E-3 E ~ 1,0E-3 d O 0 5.0E-4 0.0E+0 POE Concentration Limit (mg/L) Off-site1 Off-site2 Commercial None 100 NA 1.5E-4 NA 1.6E~4 NA 1.0E+I NA 0 10 20 30 40 Disaihce 60 70 80 90 100 · , Steady-state J. t = 2.0yr - - · - .Off-site1 Conc,Limit · - -!- - .Off-site2 Conc. Limit Concentration vs, Time Distance (ff)l 50 (for given distance from source) Time (yr 0 3 6 9 12 15 18 21 24 27 30 x = 50 ft d ~' 0.0E+0 4.6E-4 4.6E-4 4.6E-4 4.6E.-4 4.6E-4 4.6E-4 4.6E-4 4.6E-4 4.6E-4 4.6E-4 Off-site1 (100 It) ,4 ~ 0.0E+0 1.6E-4 1.6E-4 1.6E-4 1.6E-4 1.6E-4 1.6E-4 1.6E-4 1.6E-4 1.6E-4 1.6E-4 Off-site2 (0 It) NA NA NA NA NA NA NA NA NA NA NA v 5.0E-4 4.0E-4 ~ 3.0E-4 cd 2,0E-4 O 1.0E-4 0.0E+0 v 5 10 TimlE(yr) 20 25 Time to Reach Conc. Limit (yr) Off-site1 I NA Off-site2 NA · ~C],,--' x = 50 ft -' Off-sltel (100 ft) O Off-site2 (0 fi) - - · - 'Off-site1 Conc. Limit - - -t- - .Off-site2 Conc. Umit 0 3O RBC^ Tool Kit for Chemical Releases, Version 1.2 Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Constluent: Source Medium: Biode~lredatlon: Naphthalene Affected Soils Leaching to Groundwater 1st Order Job ID: 5 of 5 Concentration vs. Distance from Source Time (yr)I 2.0 (for given time) Distance {ft) 0 10 20 30 40 50 60 70 80 90 100 t =2.0yr I~E~ 6.0E-5 3.9E-5 2.6E-5 1.6E-5 9.3E-6 5.0E-6 2.6E-6 1.3E-6 6.8E-7 3.5E-7 1.8E-7 Steady-state ~A 6.0E-5 3.9E-5 2.6E-5 1.7E-5 1.1E-5 7.3E-6 4.7E-6 3.1E-6 2.1E-6 1.4E-6 1.0E-6 6.0E-5 5.0E-5 ~ 4.0E-5 ~ 3.0E-5 d ~ 2.0E-5 1.0E-5 O.0E+0 Off-site1 Off-site2 Commercial None 100 NA 1.8E-7 NA 1.0E-6 NA 4.1E+1 NA POE Concentration Limit (mg/L) Steady-state t = 2.0 yr 0 10 20 30 40 Disf~hce 60 70 80 90 100 - - ~ - .Off-site1 Conc. Limit - - +- - .Off-site2 Conc. Limit Concentration vs. Time Distance (ft)I 50 I (for given distance from source) Time (yr) 0 3 6 9 12 15 18 21 24 27 30 x -- 50 ft c~ ~' 0.0E+0 6.9E-6 7.3E-6 7.3E-6 7.3E-6 7.3E-6 7.3E-6 7.3E-6 7.3E-6 7.3E-6 7.3E-6 Off-site1 (100 It) C~ ~ 0.OE+0 6.0E-7 9.9E-7 1.0E-6 . 1.0E-6 1.0E-6 1.0E-6 1.0E-6 1.0E-6 1.0E-6 1.0E-6 Off-site2 (0 It) NA NA NA NA NA NA NA NA NA NA NA 8.0E-6 7.0E-6 6.0E-6 5.0E-6 4.0E-6 3.0E-6 2.0E-6 1.0E-6 0.0E+0 10 Timl~5(yr) 20 25 30 Time to Reach Conc. Limit (yr) Off-site1 J NA Off-site2 NA ---C3---- x = 50 ft : Off-site1 (100 ft) ~ Off-site2 (0 ft) - - II- - 'Off-site1 Conc. Limit - - -I- - · Off-site2 Conc. Limit RBCA Tool Kit for Chemical Releases, Version 1.2 I OF5 TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION IGROUNDWATER EXPOSURE PATHWAYS · (CHECKED IF PATHWAY IS ACTIVE) I $OIL8 (20.66 fi): LEACHING TO GROUNDWATER INGESTION 1) Source Medium 2) NAF Value (L/kg) 3) Exposure Medium Receptor Groundwater. POE Conc. (mg/L) (1)/(2) On-site Off-site I Off-site 2 On-site Off-site 1 Off-site 2 Soil Conc. (0 It) (100 It) (0 It) (0 It) (100 It) (0 It) Constituents of Concern (rog/kg) Commercial Commercial None Commercial Commercial None Xylene (mixed isomers) 2.5E+2 2.3E+4 8.7E+4 1.1E-2 2.9E-3 Toluene 5.7E+1 1.3E+4 2.7E+6 4.3E-3 2.1E-5 Benzene 3.4E+0 6.7E+3 1.7E+4 5.1E-4 2.0E-4 Ethylbenzene 3.6E+1 3.3E+4 2.3E+5 1.1E-3 1.6E-4 Naphthalene 1.1E+1 1.8E+5 1.1E+7 6.0E-5 1.0E-6 NOTE: NAF = Natural attenuation factor POE = Point of exposure Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Job ID: RBCA Tool Kit for Chemical Releases, Version 1.2 20F5 TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION IOROUNDWATER EXPOSURE PATHWAYS I $OIL8 (20 - eS f~: LEACHING TO GROUNDWATER INGESTION (oont'd) 4) Exposure Multiplier 5) Average Daily Intake Rate (IRxEFxED)/(BW¥,AT) (L/kg-day) (rng/kg/day) (3) x (4) On-site Off-site I Off-site 2 On-site Off-site I Off-site 2 (on) (~oo~t) (on) (on) (~oo n) (on) Constituents of Concern Commercial Commercial None Commercial Commercial None Xylene (mixed isomers) 9.8E-3 9.8E-3 1.1E-4 2.8E-5 Toluene 9.8E-3 9.8E-3 4.2E-5 2.0E-7 Benzene 3.5E-3 3.5E-3 1.8E-6 7.1E-7 Ethylbenzene 9.8E-3 9.8E-3 1.1E-5 1.5E-6 Naphthalene 9.8E-3 9.8E-3 5.9E-7 9.8E-9 NOTE: AT = Averaging time (days) ED = Exposure duration (yr) IR = Ingestion rate (rog/day) BW = Body weight (k~l) EF = Exposure frequency (da~s/yr) Site Name: Schwebel Petroleum Completed By: Job ID: Site Location: Date Completed: O-Jan-O0 RBCA Tool Kit for Chemical Releases, Version 1.2 3 OF5 TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION IGROUNDWATER EXPOSURE PATHWAYS [] (CHECKED IF PATHWAY IS ACTIVE) I GROUNDWATER: INGESTION 1) Source Medium 2) NAF Value (unitless) 3) Exposure Medium Receptor Groundwater: POE Conc, (mg/L) {1)1(2) On-site Off-site 1 Off-site 2 On-site Off-sEe 1 off-site 2 Groundwater (0 It) (0 It) (0 It) (0 It) (0 It) (0 It) Constituents of Concern Conc. (m~/LI None None None None None None Xylene (mixed isomers) Toluene Benzene Ethylbenzene Naphthalene NOTE: NAF = Natural attenuation factor Site Name: Schwebel Petroleum Site Location: Completed By: POE = Point of exposure Date Completed: 0-Jan-00 Job ID: RBCA Tool Kit for Chemical Releases, Version 1.2 4 OF5 TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION GROUNDWATER INGESTION (~ont'd) 4) Exposure Multiplier 5) Average Daily Intake Rate (IRxEFxED)I(BVVxAT~ (L/kg/day) (rog/kg/day) (3) x (4) On-site Off-site 1 Off-site 2 On-site Off-site I Off-site 2 (o ~) (o n) (o ~) (o n) (o n) (o ~) Constituents of Concern None None None None None None Xylene (mixed isomers) ,, Toluene Benzene Ethylbenzene _. Naphthalene _ NOTE: AT = Averaging time (days) ED = Exposure duration (yr) IR = Ingestion rate (mg/day) BW = Bod~/wei~lht {k~l) EF = Exposure frequeno/(days/¥r~ Site Name: Schwebel Petroleum Completed By: Job ID: Site Location: Date Completed: O-Jan-00 RBCA Tool Kit for Chemical Releases, Version 1.2 5 OF5 TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION JGROUNDWATEREXPOSURE PATHWAYS MAXIMUM PATHWAY INTAKE (rag/kg/day) pVlaxtmum Intake of aetlve paetweye eoll leeelM~ & groumfwater routee.) On-site Off-site 1 Off-site 2 (0 n) Constituents of Concern Commemlal Commercial None Xylene (mixed isomers) 1.1E-4 2.8E-5 ' Toluene 4.2E-5 2.0E-7 Benzene 1.8E-6 7.1E-7 Ethylbenzene 1.1E-5 1.5E-6 Naphthalene 5.9E-7 9.8E-9 .,. I Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Job ID: RBCA Tool Kit for Chemical Releases, Version 1.2 7 OF 10 TIER 2 PATHWAY RISK CALCULATION 1~3ROUNDWATER EXPOSURE PATHWAYS (CHECKED IF PATHWAYS ARE ACTIVE) CARCINOGENIC RISK (1) EPA (2) Maximum Carcinogenic (3) Oral (4) Individual COC Carcinogenic Intake Rate (mg/kg/day) Slope Factor Risk (2)x (3) Classification On-site (mg/kg-day)~-I On-site Off. site I Off-site 2 off-site I off-site 2 (0 n) (0 n) Constituents of Concern Commercial Commercial None Commercial Commercial None Xylene (mixed isomers) D Toluene D Benzene A 1.8E-6 7.1E-7 2.9E-2 5.2E-8 2.1E-8 Ethylbenzene D Naphthalene D Total Pathway Carcinogenic Risk = [ 5.2E-8 J. 2.1E-8 Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Job ID: RBCA Tool Kit for Chemical Releases. Version 1.2 8 OF 10 TIER 2 PATHWAY RISK CALCULATION J(3ROUNDWATER EXPOSURE PATHWAYS · (CHECKED IF PATHWAYS ARE ACTIVE) I TOXIC EFFECTS (5) Maximum Toxicant (6) Oral (7) Individual COC Intake Rate (rog/kg/day) Reference Hazard Quotient (5) I On-site Off-site 1 Off-site 2 Dose On-site Off-site I Off-site 2 (0 It) (mg/kg/day) (0 It) Constituents of Concern Commercial Commercial None Commercial Commercial None IXylene (mixed isomers) 1.1E-4 2.8E-5 2.0E+0 5.4E-5 1.4E-5 Toluene 4.2E-5 2.0E-7 2.0E-1 2.1E-4 1.0E-6 Benzene 5.0E-6 2,0E-6 3.0E-3 1.7E-3 6.6E-4 Ethylbenzene 1.1E-5 1.5E-6 1.0E-1 1.1E-4 1.5E-5 Naphthalene 5.9E-7 9.8E-9 4.0E-1 1,5E-6 2.4E-8 Total Pathway Hazard Index = I 2.0E-3 I 6.9E-4 I Site Name: Schwebel Petroleum Site Location: Completed By: Date Completed: 0-Jan-00 Job ID: RBCA Tool K~t for Chemical Releases, Version 1.2 Site Name: Schwebel Pe~'oleum Completed By:. Job ID: Site Location: Date Completed: O-Jan-00 I OF I SOIL (20 - 65 ft) SSTL VALUES Target Risk (Class A & B) 1.0E-6 Target Risk (Class C) 1.0E-5 Target I"l.~ard Quoflem 1.0E+O Groundwater DAF Option: Domenico - First Older (O~e-drectlonal ved. dspersio~l) $$TL Results For Cot tplate Exposure pathwa),s I'X" If CompleteI I I I" SOil Vo~atiiizatlon and'Surface I Surface Soil ,nllalation, Re~red CRF X Soil Leaching to C~'oundwater Soil Vol. to X X Irx3estion. Dermal Corffact Ingestion Indoor Air ~oil Partl¢¥1~19~ t~ Outdoor Air Appacable SSTL Representative On-site Off-site I Off-site 2 On-site Off-site 1 Off-site 2 SSTL Exseeded ? CONSTITUENT8 OF CONCERN Concentration l0 flI (100 fl) (0 fl) (0 fl) (hYsite (0 It) (100 It) ({3 It) On-site (0 ~) ~ if'yes' CAS No. Name (rog/kg) Commercial Commercial None None Commercial ConstmctiOnwo~kcr Comn~'clal None Commercial ConstructtOnwod(er (mg~g) "1" if yes left 1330-20-7 Xytene (mixed isomers) 2.5E+2 >5.1E+2 >5.1E+2 NA NA >5.1E+2 >5.1E+2 >5.1E+2 NA 6.4E+4 8.7E+4 6.4E+4 1['3 <1 108-88-3 Toluene 5.7E+1 >7.9E+2 >7.9E+2 NA NA >7.9E+2 >7.9E+2 >7.9E+2 NA 5.6E+3 7.6E+3 5.6E+3 r'3 <1 71-43-2 Benzene 3.4E+0 6.6E+1 1.7E+2 NA NA 2.8E+1 >1.3E+3 4.7E+1 NA 3.2E+0 1.1E+2 3.2E+0 · 1.0E+0 100-41-4 Ethy~benzene 3.6E+1 >6.4E+2 >6.4E+2 NA NA >6.4E+2 >6.4E+2 >6.4E+2 NA 3.4E+3 4.6E+3 3.4E+3 [] <1 91-20-3 Naphthalene 1.1E+1 >6.2E+2 >6.2E+2 NA NA >6.2E+2 >6.2E+2 >6.2E+2 NA 1.1E+5 1.3E+5 1.1E+5 [] <1 ">" Ir~cates risk-based target concenlration greater than constituent residual saturation value. NA = Not applicable. NC = Not calculated.