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x <br /> 7-Eleven/stockton 12 <br /> May, 1989 <br /> Maps depicting the distribution of dissolved hydrocarbons in <br /> the groundwater, based on laboratory results from monitoring and <br /> pumping well samples, are presented in Figures 7, 8, and 9. The <br /> distribution of detectable dissolved-hydrocarbons in the wells <br /> sampled was confined to MW-1, PW-2, and PW-3. <br /> Samples collected from MW-1 and PW-3 contained detectable <br /> levels of dissolved hydrocarbons in all sampling rounds. <br /> Laboratory results from the January 23, 1989 sampling of PW-2 <br /> indicated a concentration of 13 parts per billion (ppb) TPH-as- <br /> gasoline, Results from subsequent sampling rounds at PW-2 <br /> indicate TPH-as-gasoline concentrations below MDL. All other <br /> monitoring and pumping wells contained non-detectable levels of <br /> dissolved hydrocarbons in all five sampling rounds. Therefore, <br /> the dissolved-hydrocarbon plume beneath the site has not migrated <br /> significantly during this reporting period. <br /> Results of laboratory analyses of groundwater samples <br /> collected from the surrounding domestic wells indicate no <br /> detectable levels of hydrocarbons in all sampling rounds. <br /> Sporadic detection of dissolved hydrocarbons in past reporting <br /> _. periods requires furttgr study. A tabulation of laboratory <br /> results for TPH-as-gbsc�line has been compiled for monitoring and <br /> pumping weds (Table 3) and domestic wells (Table 4) . Further <br /> statistical analyses of the occurrence of sporadic detectable <br /> levels are needed to assess the risk of contamination in the <br /> domestic wells. These data will also be studied to propose a <br /> revised sampling schedule for the monitoring and domestic wells. <br /> GROUNDWATER <br /> Tramoi.00,INC. <br />