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29 January 2002 <br /> ' AGE-NC Project No. 98-0466 <br /> Page 11 of 25 <br /> 2.6. BURN PITS AND FORMER TEEPEE STRUCTURE IRNN4C I RATOR <br /> Waste wood and trash were disposed on-site in two open burn pits wt st of the storm water pond <br /> ' from the 1960s to the late 1970s, and in a metal teepee incinerator sou th of the former cover plant <br /> building and north of the former box factory building on the west side of the railroad track traversing <br /> the property. The bum pits were backfilled circa 1984 and were subs quently re-excavated circa <br /> 1994. Soil excavated from the burn pits and former teepee area is stockpiled on the site north and <br /> east of the northern bum pit. <br /> ' 2.6.1. Bum Pits and Former Teepee Area Assessment Status <br /> ' Laboratory analysis of soil samples collected from the burn pits teepee structure area by <br /> Kleinfelder revealed localized elevated concentrations of metals (copper, lead and zinc) compared <br /> ' to background concentrations,and low concentrations ofchlorinatedhy ocarbons(DCMA,PCE and <br /> TCE). The concentrations encountered,while locally elevated for some analytes,have generally been <br /> below levels of environmental concern. Locations of the burnpits and teepee structure are shown on <br /> NFigure 2. <br /> With the exception of soil sample 63599 (a soil sample from the fill in tl e north pit) among samples <br /> ' collected in 1992, metals concentrations ranged as follows: <br /> • Nickel-<10 milligrams per kilogram(mg/kg) to 30 mg/kg; <br /> ' • Copper - 29 to 220 mg/kg; <br /> • Lead- <5 to 180 mg/kg; <br /> ' Zinc - 50 to 2,200 mg/kg; <br /> • Arsenic - 6 to 11 mg/kg (teepee area); and <br /> tChromium-30 to 65 mg/kg (burn pits) <br /> Sample 63599, collected at 10 feet below surface grade (bsg) in thl north burn pit, contained <br /> 30 mg/kg nickel, 11,000 mg/kg copper, 1,500 mg/kg lead,400 mg/kg zidc,and 65 mg/kg chromium <br /> Among the 1992 soil samples analyzed, only the lead concentration in sample 63599 and the arsenic <br /> ' concentrations in the teepee area exceeded the PRGs for industrial soil issued by Region 9 of the US <br /> EPA. Table 2 shows the Title 22 Total Threshold Limit Concentration TTLC), Soluble Threshold <br /> Limit Concentration(STLC),the Maximum Contaminant Level(MCL) or drinking water, and EPA <br /> Region 9's PRGs for industrial and residential soil. <br /> In addition to metals, sample 63599, collected in the backfill in the no here pit in 1992, contained <br /> 6 gg/kg dichloromethane(DCMA), 8 µg/kg trichloroethene(TCE), and 27 µg/kg tetrachloroethene <br /> Advanced GeoEnvironnrental,Inc. <br /> 1 <br />