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CONFIDENTIAL 12686 264ocke Rd.,Lockeford,California AMES Project No.0041 3.0 INVESTIGATIVE METHODS r, 3.1 Property Description Asset Management & Environmental Services (AMES) completed a Limited Phase H ` Environmental Site Assessment at the subject Site on May 23, 2000. The Site is currently vacant. The Site comprises 21.62 acres containing three large structures (Building #1, #2, and a pole barn), a fire pump house, fire pond, and a storm water evaporation holding pond. Previous usage of the site consisted of the manufacture of wood products. 3.2 Drilline and Sampling Methods AMES lowered one manual spoon sampler (3'/2 " - diameter) within the four inch diameter french pipe of each of the four dry wells. The dry wells were approximately twenty-five feet in depth. The borings were advanced to a maximum depth of 6 inches from the bottom surface. The soil-filled sample tubes were then labeled top and bottom. The bottom portion of the sampling tube contained the soil sample approximately 6" from the bottom surface. The laboratory was then instructed to remove their sample extraction from the bottom portion of the sampling tube. Water was not encountered in the dry wells. The soil samples were collected using a butterfly valve spoon sampler driven in advance of a 10-pound hand-operated hammer. AMES staff removed the tube from the sampler for analysis. The ends of the soil-filled sample tubes were sealed with Teflon-lined caps and taped. The soil samples were labeled and stored in a chest containing ice. The soil samples were transported, under chain-of-custody, to a state-certified analytical laboratory (Kill Analytical) for analysis. The four dry wells located within the evaporation pond were identified as NE (northeast corner), .� SE(southeast comer), NW(northwest comer), and SW (southwest corner). 3.3 Chemical Analyses Methods The four soil samples were submitted to Kiff Analytical (state-certified laboratory), located in Davis, California. Kiff Analytical is Cal-EPA certified (certificate #2236) for the analyses �. performed for this investigation. The samples were analyzed for total petroleum hydrocarbons (TPH) as gasoline and diesel using Modified EPA Method 8015, for Aromatic Hydrocarbons (BTEX) using EPA Method 8020, and for 17 California Administrative (CAM) Metals using EPA Method 7000/6010, as requested by San Joaquin County Environmental Health Division(Mr. Robert McClellon). 3.4 Chemical Analyses Results Analysis results for the soil samples indicated no significant concentrations of the constituents specified for analyses. Only Toluene and Total Petroleum Hydrocarbons as gasoline (TPHg) were detected slightly above the laboratory detection limits in the NW and SW dry wells. Analysis results for the NW dry well were 1.4 ppm for Toluene, and 2.0 ppm for TPHg. Analysis results for the SW dry well were 0.034 ppm for Toluene, while no TPHg was detected 2