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r- iClayton 4.0 T .N: . Soil and groundwater samples were analyzed for suspected chemical constituents by En,�ironmental Protection Agency (EPA) Method 5030;8015-8020 (soil and water), for feral petroleum hydrocarbons as gasoline and benzene, toluene, ethylbenzene, and xylenes (BTEX). 4.1 SOIL SAIMPLE ANALYSES The soil sample; taken at 1:.6.5ftcontained 0.16 milligrams per kilogram (mg/kg} toluene and 0.3 mg/kg gasoline, oth of these concentrations are below state action levels. The mg/kg unit of measurement is approximately equal to parts per million (ppnn). None of the other compounds for which the laboratory conducted analyses were detected in the 16.5 ft sample. rhes cum ounds were detected in thv sample taken at 40 ft bas. The !aboratory report is included as Appendix G. 4.2 GROUNDWATER SAMPLE ANALYSES The groundwater sample contained 1.9 micrograms per liter (49/L) toluene, 2.1 4g/L ethylbenzene, 3.7 µa_f�, xylenes, a nasoline. Micrograms per liter are approximately equa. to parts per billion (ppb). oluene, ethylbenzene, and xylenes concentrations are all below the state action levels. No action level has been set for ,gasoline. However, the presence of these compounds indicates that groundwater beneath the: site has been impacted by petroleum hydrocarbons. The laboratory rept ort is included as Appendix H. 5-0 CONCLUSIMNS \T NT Petroleum hydrocarbons are present in soil and groundwater beneath the subject site, although the concentrations are below state action levels. A fuel leak was documented at a car repair shop at 141 :North El Dorado Street. The site of the leak is crossgradient to upgradient of the; subject site. There was no known onsite source of the contamination. Contamination at the subject site may have migrated from the; car repairs op. Clayton recommends notifying the owner of the car repair shop of the results of this investigation. The owner should be asked to define the horizontal extent (non-detect line) of the known petro!eum contaminated soil and groundwater resulting from the leak. This is typically required by the Regional Water Quality Control Board (RWQCB) and County Health Agencies. A copy of this report must be submitted to San Toaquin Public Health Services Environmental Health Division to comply with their requirements. Mations The information and opinions rendered in this report are exclusively for use by American Savings Bank. Claytun Environmentul Consultants, Inc. will not distribute this report without your consent except as may be required by law or court order. The information and opinions expressed in this report are given in response to our