Laserfiche WebLink
1, <br /> 7-Eleven/Stockton <br /> May 1990 25 <br /> The samples collected from Mw-1 contained detectable levels <br /> M of dissolved hydrocarbons in all sampling rounds this quarter. <br /> Results showed concentrations of TPH-as-gasoline in MW-1 ranging <br /> from 170 to 620 parts per billion (ppb) . These concentrations <br /> remain consistent with levels detected during the previous <br /> reporting period. Results from analyses of samples collected <br /> from Mw-5, MW-14, MW-17B, and MW-17C showed they contained levels <br /> of dissalved hydrocarbons in only one sampling round during this <br /> quarter. The maximum concentration of TPH-as-gasoline reported <br /> in samples from these wells was 12 ppb. Results from laboratory <br /> analyses of samples collected from RW-1 showed continued levels <br /> i of dissolved hydrocarbons both times it was sampled during the <br /> rz quarter. Concentrations of TPH-as-gasoline in RW-1 ranged 11 to <br /> 49 ppb. All other monitoring and pumping wells contained non- <br /> detectable levels of dissolved hydrocarbons in all three sampling <br /> ,- rounds. Historical results of past laboratory data for all <br /> 4 <br /> monitoring and g pumping wells are tabulated in Appendix C. <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 /> carbons during any of the sampling rounds. Sporadic unconfirmed <br /> occurrences of low concentrations of dissolved hydrocarbons have <br /> c <br /> is been reported in the past. Tabulations of the laboratory results <br /> for TPH-as-gasoline compiled for the domestic wellA <br /> . �., (Appendix C) <br /> suggest that these wells have not been significantly impacted <br /> with gasoline hydrocarbons. <br /> During this reporting period, five groundwater monitoring <br /> wells could not be monitored or sampled. Prolonged decline in <br /> groundwater levels has caused MW-2 <br /> MW-3, MW-4, and MW-12 to go <br /> dry. Monitoring well Mw-6 is also no longer in service, since it <br /> was abandoned in September 1986 due to the reconstruction of <br /> Thornton Road. <br /> GROC1DGt.-WER <br /> TECHNOLOCY.I\C. <br />