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7-Eleven/Stockton 20 August 1990 Maps depicting the distribution of dissolved hydrocarbons in the groundwater, based on laboratory results from monitoring well samples from May, 1990, are presented on Figure e. The distribution of detectable dissolved-hydrocarbons in the monitoring wells sampled during this quarter was confined to samples from MW-1 MW-5 MW-17b, MW-17c, and RW-1. Analytical results showed that th highest concentration of dissolved hydrocarbons was detect in the sample collected from MW-1 for the sampling round this anter. Results showed a concentration of 150 ppb TPH-as-gasoline in the sample from M14-1. This concentration is slightly 1 wer than the levels detected during Cie pervious reporting peri The maximum concentration of TPH- as-gasoline reported in sampl s from MW-5 and MW-17c was 18 ppb. The concentration of TPH-as-ga oline reported in the sample from RW-1 was 27 ppb. All other mo 'tering wells contained non- detectable levels of dissolved drocarbons. Historical results -• of past laboratory data for all onitoring and pumping wells are tabulated in Appendix F. The results of laboratory ana\sve of groundwater samples collected from the domestic wells unding the site indicate that no wells contained detectablels of dissolved hydrocarbons during this sampling . Sporadic unconfirmed occurrences of low concentrations ssolved hydrocarbons have been reported in the past. Tabulations of the laboratory results for TPH-as-gasoline compiled for the domestic wells (Appendix F) suggest that these wells have not been s'gnificantly impacted by gasoline hydrocarbons. During this reporting period, eight gundwater monitoring .. wells could not be monitored or sampled. A rolonged decline in water level has caused M19-2, Mw-3, MW-4, - IW-10, MW-12, 1a GkOUNIMATEk �r:cnvu[.trcv.InC. ✓�