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i <br /> Groundwater Monitoring <br /> Initial sampling and analysis of the three groundwater monitoring wells installed by Murray <br /> & Associates at the Stan Morri Dealership during the Problem Assessment Investigation <br /> indicated the presence of low Ievels of 1,1,1 trichloroethane, 1,1 dichloroethane <br /> chloroethane, and dichlorodifluoromethane in two of the w:.iis. Although all of these <br /> I <br /> purgeable halocarbon compounds were present in concentrations well below the State arid <br /> EPA Action Levels, it was apparent that these constituents�:ould nave originated from the <br /> former waste oil tank at the Ford garage. As a result, Murray &. sociates proposes to. <br /> i <br /> sample each of the monitoring wells on a quarterly basis for the period <br /> e year. if the. <br /> `! <br /> organic contamination has originated from the waste tank,then the removal of both the tank <br /> and the contaminated soil should result in the decline of organic contamination in the <br /> groundwater. Water samples,collected on a quarterly basis,will be evaluated for purgeable <br /> haiocarbon compounds (EPA Method 601). <br /> €; Prior to sampling, each of the three monitoring wells will be purged of approximately one, <br /> to three well volumes of water,or untilthe specific conductance,temperature and pIi of the <br /> r <br /> water have stabilized. Following the purging of each well, duplicate water samples will be <br /> collected and placed into 40 m!vials. A clean dedicated hand bailer will be used to sam le <br /> p <br /> each well. Each water sample will'`be Iabelecl,placed on ice, and transported to California <br /> Water Laboratory for analysis under Chain of Custody within 24 hours of collection. <br /> 3 <br />