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For the surface soil samples collected from each half-acre grid, they will be laboratory- <br /> composited into eight composite samples (one each composite from one-acre grids with <br /> the exception of the one and a half acre southern section) for analyses. The three surface <br /> soil samples collected from the southern one and one half-acre section will be <br /> laboratory-composited into one composite sample. Therefore, a total of nine composite <br /> surface soil samples will be analyzed. At the laboratory, aliquots from each tube will be <br /> blended by the analytical laboratory and analyzed as a singular sample. The nine <br /> composite surface soil samples (and the blind duplicate sample) will be analyzed for <br /> Organochlorine Pesticides (OCPs) using EPA Method 8081 and Lead (Pb) using EPA <br /> Method 6010. Additionally, four discrete surface samples will be analyzed for CAM 17 <br /> heavy metals and another five discrete surface samples will be analyzed for Arsenic, <br /> both by EPA Method 6010. <br /> For the subsurface samples, four randomly selected samples will be selected by the <br /> laboratory and analyzed for OCPs. The remaining subsurface samples will be held <br /> pending the results of the surface sample analyses. If any of the surface soil samples <br /> exhibit compounds of concern as indicated by the DTSC guidelines, then the discrete <br /> samples making up the surface composite will be analyzed to determine at which <br /> location the detected compound of concern exists. Following this discrete surface soil <br /> sample analysis, the corresponding subsurface sample will be analyzed. This will <br /> provide for vertical compound presence definition. The nine stockpile samples will be <br /> analyzed for the same constituents as the surface soil samples with three of the nine, <br /> (one upper, one mid and one deeper sample) analyzed for CAM17 Metals. <br /> If background soil sample analyses are required for the Site, these samples will be <br /> analyzed for CAM 17 Metals by EPA Method 6010. <br /> Further details concerning of Quality Assurance/Quality Control measures, analysis <br /> methods, and laboratory Method Detection Limit procedures are provided in the <br /> attached Project Plan Site Investigation Program report. <br /> 031090-10(3) -5- CONESTOGA-ROVERS&ASSOCIATES <br />