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October 25, 1993 4.0 LABORATORY ANALYSES Soil and groundwater samples p es from the former cluster of diesel tanks and pump islands were analyzed for TPHg, TPHd, and BTEX Groundwater samples from the well near the former waste oil tank were analyzed for TPHg, TPHd, BTEX, oil & grease, priority pollutant metals, and chlorinated volatile hydrocarbons 4.1 Soil and Groundwater Analyses Analyses were performed using Environmental Protection Agency (EPA) Method 8015 (modified) for TPHg and TPHd, EPA Method 8020 for BTEX (soil), EPA Method 602 for BTEX (water), EPA Method 601 for chlorinated hydrocarbons, EPA Method 9070 for Total Oil & Grease, and EPA Method 200 7 for priority metals (Cadmium, Chromium, Lead, Nickel, and Zinc) Sample preparations are shown on the laboratory data sheets in Appendix B The analyses were performed by California Laboratory Services of Rancho Cordova, California, a State-certified environmental laboratory 4.2 Results of Laboratory Analyses Y The results of the analyses are listed in Tables 2 and 3 The locations of the borings are plotted on Figure 2, and copies of all laboratory analyses reports are included in Appendix B 4 2 1 Former Diesel Tank Site/source The analyses of soil samples collected from borings in the area of the former diesel tanks and pump islands indicate that petroleum hydrocarbons are not present near the groundwater surface No detectable contamination was found in the soil or groundwater samples analyzed Results of analyses of soil samples collected from the angled boring indicate that petroleum hydrocarbons were not detected under the sidewalk along the western property boundary at the points sampled for analysis Table 2 presents a summary of analytical test results for the diesel tank area and pump island area r r r ROGER 323-oo,itpT —7— F®T T ASSOCIATES