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SELECTION OF SOIL SAMPLES FOR CERTIFIED LABORATORY ANALYSES <br /> A WEGE geologist selected all three groundwater hydropunch samples and l I of the 19 <br /> soil samples for certified laboratory analyses. The selections were based on PID readings <br /> from the individual soil samples and their lithology. Soil samples were selected from the <br /> 25.5, 30.5, 35.5, 40.5, 46.0, 50.5, 55.5, 58.5, 64.0, 72.5, and 79.5 foot depth intervals. <br /> Following the initial laboratory analysis of the 11 soil samples, two additional soil <br /> samples from the 62.0 and 68.0 depth intervals were also selected for analysis, because <br /> traces of Benzene were detected in samples from the depth intervals above or below those <br /> samples. <br /> CERTIFIED LABORATORY ANALYSES OF SOIL AND GROUNDWATER SAMPLES <br /> Kiff Laboratories analyzed the 13 soil samples and three groundwater samples for <br /> concentrations of Total Petroleum Hydrocarbons as Gasoline (TPH-G), Benzene, <br /> Toluene, Ethylbenzene, and Xylenes (BTEX) and Methyl Tert-Butyl Ether (MTBE) <br /> using EPA method 8260B. Kiff also analyzed the three hydropunch groundwater <br /> samples for concentrations of the oxygenants TBA, MTBE, DIPE, ETBE, and TAME <br /> using EPA method 8260B. Soil samples from the 25.5, 30.5, 40.5, and 50.5 depth <br /> intervals were analyzed for concentrations of total lead using EPA method 6010. <br /> DESTRUCTION OF SBI DISPOSITION OF CUTTINGS AND RINSATES <br /> Following soil and groundwater collection, Woodward Drilling Co. grouted the soil <br /> boring SB I to surface by tremie with neat cement and < 5% bentonite. <br /> The approximately one cubic yard of soil cuttings generated by the drilling of SBI were <br /> stored on a base and under a covering of 6-mil visquine in a fenced compound at the rear <br /> of the site. Wastewater generated from the steam cleaning of the augers and evacuation <br /> of groundwater from the soil boring during grouting were stored in labeled 55 gallon <br /> DOT approved drums inside the fenced compound. <br /> RESULTS OF SOIL AND GROUNDWATER INVESTIGATION <br /> The certified analytical laboratory results from the 13 soil samples and two groundwater <br /> samples collected on December 11, 2000 are listed in Table 1. A copy of Kiffs <br /> laboratory report is included as Appendix C of this report. <br /> SOIL <br /> TPH-G concentrations in the 13 soil samples ranged from a maximum of 160 mg/kg in <br /> the sample collected from 25.5 feet bgs to below the laboratory detection limits of I <br /> mg/kg in all soil samples collected below 35.5 feet bgs. <br /> ARC SRPT 3/2/01 4 <br />