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Table 5 <br /> Historical Soil Analytical Data Compared to San Francisco Bay Regional Water Quality Control Board Environmental Screening Levels <br /> ARCO Service Staton 2130 <br /> 7906 North EI Dorado Street <br /> Stockton , California <br /> Sample TPH as TPH as <br /> Sample Depth Date Gasoline Diesel Benzene Toluene Ethylbenzene Xylenes MTBE Lead <br /> Name (feet) Sampled (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) <br /> VW-9 (B-14) 31 .5 August-92 <1 .0 NA <0.005 <0.005 <0.005 <0.005 NA NA <br /> 41 .5 August-92 2.6 NA 0.21 0.54 0.056 0.45 NA NA <br /> VW-10 (B-15) 31 .5 August-92 1 NA 11.015 0.037 0.016 <0.005 NA NA <br /> 41 .5 August-92 22.0 NA 1 .7 3.9 0.56 3.0 NA NA <br /> 56.5 August-92 24 NA 0.34 0.83 0.30 1 .5 NA NA <br /> AS-1 (B-17) 46.5 August-92 4.8 NA 0.03 0.06 0.039 0.26 NA NA <br /> 61 .5 August-92 73 NA 1 .1 1 .7 0.18 0.99 NA NA <br /> AS-2 (B-26) 21 08/09/95 <1 .0 NA <0.005 0.019 <0.005 0.011 NA NA <br /> 51 08/09/95 <1 .0 NA <0.005 0.0059 <0.005 0.014 NA NA <br /> AS-3 (B-27) 36 08/10/95 79700 NA 6.1 460 170 910 NA NA <br /> 56.5 08/10/95 920 NA 8.4 51 18 92 NA NA <br /> Explanation <br /> PH = Total petroleum hydrocarboNA <br /> MtBE = Methyl tertiary Butyl Ether <br /> NA = Not analyzed <br /> mg/kg = milligrams per kilogram <br /> ` - Hydrocarbon in requested fuel range , but doesn'tresemble requested fuel <br /> - All samples analyzed after hold time expired <br /> Notes: Environmental Screening Levels (ESLs) from the San Francisco Bay Regional Water Quality Control Board (February 15, 2005) Table E-1b Soil <br /> Screening Levels for Evaluation of Potential Vapor Instrusion Concerns Residential Exposure . <br /> 1 Exposure assumed to only be from shallow soil (i.e . less than 10 feet). <br /> 2 Exposure assumed to only be from deep soil (i.e. greater than 10 feet). <br /> 2130 Arco Historical soil-ESL comparison Page 4 of 4 SECOR <br />