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s <br /> 7-Eleven/Stockton 13 <br /> November 1990 <br /> o Domestic wells TMG, 1912, 1927, 8968, 9140, 9155, and <br /> 9172 were sampled monthly on three occasions starting <br /> with the sampling round on July 19, 1990. <br /> - The results from groundwater sampling and analyses are <br /> discussed below. A summary of the laboratory analytical results <br /> from groundwater samples is provided in Appendix C. The <br /> laboratory analytical reports are provided in Appendix D. <br /> Maps depicting the distribution of dissolved hydrocarbons in <br /> the groundwater, based on laboratory results from monitoring well <br /> samples from August, 1990, are presented on Figure 7. <br /> The distribution of detectable. dissolved-hydrocarbons in the <br /> monitoring wells sampled during this quarter was confined to <br /> samples from MW-1, MW-15a, and RW-1. Analytical results showed <br /> that the highest concentration of dissolved hydrocarbons was <br /> detected in the sample collected from MW-1 for the July 19, 1990 <br /> sampling round. Results showed a concentration of .5 parts per <br /> billion (ppb) TPH-as-gasoline in the sample from MW-1. This <br /> concentration is lower than the levels detected during the <br /> previous reporting pariod. The concentration of TPH-as-gasoline <br /> reported in the sample from MW-15a was 1 ppb. The concentration <br /> of TPH-as-gasoline reported in the sample from RW-1..was 62 ppb. <br /> Samples from other monitoring wells contained non-detectable <br /> ° levels of dissolved hydrocarbons. Historical results of past <br /> laboratory data for the monitoring and pumping wells are <br /> tabulated in Appendix E. <br /> is <br /> The results of laboratory analyses of groundwater samples <br /> collected from the domestic wells surrounding the site indicate <br /> that no wells contained detectable levels of dissolved hydro- <br /> �" C� <br /> GROUNDWATER <br /> TECHNOLOGY,INC. <br />