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9505 North West Lane, Stockton, California F93808.01 March 25, 2005 Page 3 were collected using a hand-auger devise and sampler. The samples were collected by hand-augering to the appropriate depth and then driving a pre-cleaned sampler with a stainless-steel sleeve into the undisturbed soil to collect the sample. Samples were collected at the surface and at various depths within the fill material up to 10 feet bgs. In addition, two surface samples were collected in an area not associated with the area of imported fill for a background comparison of the site. The sampling locations are shown on Drawing 1 along with the approximate dimensions of the imported fill material. Soil samples were collected in stainless steel sampling sleeves and covered on each end with teflon sheets and plastic end caps. The samples will be stored in an ice chest cooled to 4 degrees centigrade using blue ice. The samples were delivered under chain-of-custody to Twining's state certified laboratory for analysis. After completion of the soil sampling, the soil borings were backfilled with bentonite pellets and hydrated. Cuttings from the soil borings and rinseate from the decontamination of the sampling tools were sealed in a United States Department of Transportation (DOT) approved 55-gallon drums, labeled, and stored on-site in an area inaccessible to the public. Laboratory Testing Program: A composite of the four surface samples, and five discrete samples collected at different depths from the imported fill material were analyzed in the, laboratory for potential constituents of concern. Since the source of the fill material is unknown the samples were analyzed for the following potential constituents of concern: CAM 17 metals using United States Environmental Protection Agency (US EPA) Method 6010B and 7471, Chromium VI using US EPA Method 7199, Cyanide using US EPA Method 335.2, Polynuclear Aromatic Hydrocarbons (PAHs) using US EPA Method 8310, Semivolatile Organic Compounds (SVOCs) using US EPA Method 8270, Polychlorinated biphenyls (PCBs) using US EPA Method 8082, Total petroleum hydrocarbons (TPH) - carbon chain speciation using US EPA Method 8015, Organochlorine pesticides using US EPA Method 8081A, and Organophosphate pesticides using US EPA Method 8141A. In addition, the two surface samples collected from the native material were analyzed for CAM 17 metals for comparison of metal concentrations. Twining is a California Department of Health Services certified hazardous waste laboratory (Certificate No. 1371) for the analyses outlined herein. A description of laboratory quality assurance/quality control procedures proposed for the analyses are described in the SOPs presented in Attachment A. ANALYTICAL RESULTS A summary of the laboratory analytical results are presented in Table 1. Copies of chain-of-custody documents and certified analytical reports are included in Attachment B.