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P _ <br /> — Harding Lawson Associates <br /> xylenes and TPH as gasoline were below the analytical detection <br /> limits, while only a trace of toluene was detected at 0.7 ppb. <br /> - Benzene and ethylbenzene concentrations were below the analytical <br /> detection limits in the groundwater sample collected from MW-2 on <br /> July 3, 1991, while very low toluene, xylenes and TPH as gasoline <br /> concentrations were found (1.7 ppb, 1.0 ppb and 0.05 ppm, <br /> respectively) . Concentrations of BTEX, TPH as gasoline and fecal <br /> coliform were below the analytical detection limits in <br /> groundwater collected from MW-3 on July 3, 1991. <br /> r� <br /> Results of the chemical analyses on groundwater samples <br /> collected from the on-site domestic well (sample ID CDW) and <br /> ,rte <br /> MW-1, MW-2, and MW-3, on August 5, 1991, indicated non-detectable <br /> concentrations of TPH as gasoline and BTEX in all four <br /> groundwater samples. Fecal coliform in groundwater from MW-3 was <br /> again non-detectable. <br /> �. Results of the chemical analyses on groundwater samples <br /> i <br /> collected from MW-1, MW-2, a;id MW-3, plus the QA/QC samples from <br /> MW-4 (trip blank.) and Mw-5 (equipment rinsate blank) on.September <br /> 3, 1991, indicate non-detectable concentrations of TPH as <br /> gasoline and BTEX in all five samples. <br /> CONCLUSIONS <br /> On the basis of results obtained from HLA's investigation, <br /> y it is our opinion that the low concentrations (3.4 to 5.6 ppb) of <br /> toluene found in soil samples are of limited significance. <br /> 11 <br /> is <br />