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d � <br /> s� „ <br /> ARCADIS Ms. Lori Duncan <br /> October 8, 2008 <br /> i <br /> Soil Borings <br /> Five soil borings were advanced at the locations shown on Figure 1. Prior to drilling, <br /> each location was hand cleared using an air knife to a depth of 8-feet 1-inch (utility <br /> clearance depth) bgs. Four of'the soil boring locations were completed as monitoring <br /> wells. The fifth boring located southwest of the former dispenser islands was <br /> advanced to the top of the water table, and grouted to ground surface upon <br /> completion. The water table was typically encountered at approximately 58 feet bgs, <br /> and the wells were screened at depth intervals of approximately 65 to 75 feet bgs.A <br /> minimum of two soil samples, from each boring location, were collected for laboratory <br /> analysis during the advancement of the borings. <br /> Soil Analytical Data <br /> A total of 14 soil samples were packed on ice, cooled to approximately 4° centigrade, <br /> and shipped, under appropriate chain-of-custody protocols, to Lancaster <br /> Laboratories Incorporated (Lancaster)of Lancaster, Pennsylvania for-analysis. Soil <br /> samples were analyzed for the following analytes: <br /> • TPH-GRO[C6-C121, total petroleum hydrocarbons in the diesel range(TPH-DRO <br /> [C10-C281), total petroleum hydrocarbons in the motor oil range(TPH-MO.[C16-C361), <br /> methanol, and ethanol by United States Environmental Protection Agency <br /> (USEPA) Method 8015 <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX)by USEPA Method <br /> 8260B <br /> • Tertiary butyl alcohol (TBA), methyl tertiary butyl ether(MTBE), ethyl tertiary butyl <br /> I <br /> ether(ETBE), tertiary amyl methyl ether(TAME), di-isopropyl ether(DIPE), 1,2- <br /> DCA, and 1,2-dibromoethane(EDB)by USEPA Method 8260B <br /> TPH-GRO, TPH-DRO, TPH-MO, BTEX, TBA, MTBE, ETBE, TAME, DIPE, 1,2-DCA, <br /> and EDB were below laboratory method detection limits (MD Ls) in all soil samples <br /> collected. Methanol was detected at concentrations of 0.25 mg/kg and 0.20 mg/kg in <br /> the soil samples collected from MW-3(40 feet bgs) and B-3 (40 feet bgs), <br /> respectively. Ethanol was detected at a concentration of 0.76 mg/kg in the soil <br /> sample collected from MW-3 (40 feet bgs). ESLs have not been established for <br /> ethanol or methanol concentrations in soil. Soil analytical data are presented in <br /> Page: <br /> �- <br /> 4/1 0 <br /> Uamadis-usblrtoedatalSa mento-CAtEN\ACHEVROM30907516 DelivemblesVRepor s\Assessmenll309075 Assessment Report_181810950Ax <br />