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3) Preliminary calculations for the groundwater <br /> treatment system demonstrate a radius of capture <br /> well beyond the location proposed for the <br /> additional borings making any data acquired <br /> attendant to placement of these borings transient <br /> in nature . <br /> Quarterly Compliance Monitoring of the On-Site Wells <br /> Sampling of the three on-site, 4-inch inside-diameter <br /> groundwater monitoring wells (MW-1 , MW-2 , and MW-3 ) was <br /> performed on March 10-11 , 1994 with the approval of Mr. <br /> Michael Infurna of San Joaquin County Public Health <br /> Services , Environmental Health Division (PHS/EHD) . <br /> Depth to water and total depth of each of the wells were <br /> measured using an electric tape and the volume of water <br /> within each well casing was computed. Each well was then <br /> purged using clean, disposable, polyethylene bailers until <br /> the groundwater was free of significant sand, silt , and/or <br /> other grit , and temperature, pH, and electrical f <br /> conductivity readings stabilized. In this case, over three <br /> well volumes of water were removed from each well . <br /> Measurements acquired attendant to sampling appear on the <br /> well monitoring forms enclosed in Appendix A. <br /> Subsequent to the purging of each well , a groundwater <br /> sample was collected in a clean, disposable polyethylene <br /> bailer . Each sample was transferred into one-liter amber <br /> glass sample bottles and Volatile Organic Analysis (VOA) <br /> vials containing sufficient hydrochloric acid preservative <br /> to reduce the pH of the sample to less than 2 .0 . Each <br /> sample container was promptly fitted with a teflon-lined <br /> screw cap, labeled, placed on ice, and transported under <br /> chain of custody to Priority Environmental Labs of <br /> Milpitas . Analyses were subsequently performed for Total <br /> Petroleum Hydrocarbons as Diesel (TPH-D) , Total Petroleum <br /> Hydrocarbons as Gasoline (TPH-G) , benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) using EPA Methods <br /> 3510/8015 and EPA Methods 5030/8015-8020 ( 602) . <br /> Copies of the results of certified analyses as received <br /> from JL Analytical Services are enclosed within Appendix A. <br /> These results and those from the August , 1993 and December, <br /> 1993 quarterly samplings are summarized in Table 3 : <br /> Page 6 <br />