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T � ' 07 May 2002 AGE-NC Project No. 98-0466 Page 7 of 16 concern were detected in soil and ground water samples collected fro near the former teepee structure. One soil boring (PB 11) was advanced north(down-gradient) of the nort burn pit to collect a grab ground water sample for metals, formaldehyde and VOC analyses. Formaldehyde was detected at a concentration of 120 µg/1 in the ground water sample collected from boring PB 11. The detected concentration was slightly above the AL of 100 µg/l. Dissolved chromium was detected in the ground water sample collected from boring PBI lat a concentration of 0.026 mg/l. The detected concentration of chromium was below the MCL of 0.05 mg/1. Dissolved lead was detected in the groundwater sample collected fromboring PBI 1 at a concentration of 0.032 mg/l,above the AL and the United States Environmental Protection Agency's National Primary Drinking Water Regulation of 0.015 mg/1. To determine the down-gradient extent of metals-impacte4 ground water at the north burn pit/north storm water basin areas,AGE proposes advancing one bo g for collection of a grab ground water sample. 3.4.2. Soil Stockpiles Assessment Status Approximately 1,500 to 2,000 cubic yards of soil are stockpiled near the former burn pits. Appendix A shows a sketch prepared by SSSE apparently identifying the, burn pit or teepee source for the different areas of the stockpiles. Due to the low quality of the much}duplicated drawing,AGE has remarked a second copy for greater clarity. Figure 6 shows the current distribution of the 1,500 to 2,000 cubic yards of stockpiled soil. The stockpiled soil ranges in color from grey to reddish orange and contains abundant debris,such as burned organic and plastic n iaterial, scrap metal,glass, burned or partially burned wood, concrete, brick, cobbles and gravel. In 1999 and 2000, AGE sampled the soil piles excavated from the former bum pits for laboratory analysis to characterize the soil for disposal purposes. Figure 6 shows the sampling localities and distribution of the soil stockpiles. Composite samples have been analyzei I for CAM 17 metals, pH, TPH-d (diesel), TPH-mo (motor oil), TRPH, and dioxins. Selected samples were also analyzed for herbicides and pesticides. Selected samples or composite samples with elevated total concentrations of detected metal analytes exceeding the soluble threshold limit concentrations multiplied by 10 w e analyzed for the soluble metals concentrations. Lead, barium and chromium had total concentra 'ons that created potential concern for soluble metals. The composite soil samples were made up of samples collected from the same or similar soil piles as shown below; the layout of the soil stockpiles used for composing is shown on Figure 6: Composite No. 1 = SPI-3 + SP2-1 + SP24 + SP3-2 + S 3- Advanced GeoEnvirmnuentel,Im.