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5.0 Composite Soil Sampling - Clean Stockpiles Two soil samples were collected from the East Excavation "clean" stockpile, and two soil samples were collected from the West Excavation "clean" stockpile. The sample locations (S-1 , S-2, S-3, and S-4) are shown on the Site Map .included as Exhibit 2. Each stockpile was divided into two sections. The stockpiles were then potholed to 'a depth of approximately 18 inches, and samples were collected in 2.5 inch-diameter 1 brass tubes driven into the stockpile using a rubber mallet. The soil samples were sealed with teflon, end caps, and tape. The soil samples were then labeled in accordance with EPA protocols, recorded on chain-of-custody documents, inserted into zip-lock plastic bags, placed in a cooler at 4°C or less, and transported to FGL with the Chain-of-Custody for the specified analyses. Soil samples S-1 and S-2 were collected from the East Excavation "clean" stockpile and composited into one sample by FGL. The composite sample was analyzed for ; TPHg and BTEX using EPA Methods 8015M and 8020, respectively. Detection limits were 1.0 mg/kg for TPHg and .005 mg/kg for BTEX. Non-detectable concentrations of TPHg and BTEX were reported in the composite sample. The laboratory reports and chain-of-custody documents are included in Appendix C. Soil samples S-3 and S-4 were collected from the West Excavation "clean" stockpile and were also composited into one sample by FGL. The composite sample was analyzed for TOG and VOH using EPA Methods 418.1 and 8010, respectively. Detection limits were 10.0 mg/kg for TOG and 5.0 ug/kg for VOH. Laboratory results indicated a concentration of 240 mg/kg of total petroleum hydrocarbons as oil and grease, and non-detectable concentrations of all VOH analytes. The laboratory reports and chain-of-custody documents are included in Appendix C. 1 ' 5.1 Discussion of Analytical Results - Composite Soil Samples, Analytical results indicated non-detectable concentrations of TPHg and BTEX for composite soil sample S-1 and S-2 for the East Excavation "clean" stockpile. This material was used to backfill the East Excavation after Mr. Infurna indicated during telephone conversations that this would be acceptable to the County. Laboratory analysis of composite soil sample S-3 and S-4 from the West Excavation liclean" stockpile indicated concentrations of 240 mg/kg TOG. Based on this result, AGI recommends that the soil in the West Excavation "clean" stockpile be profiled and transported to FLI for disposal- . f i� 8of10