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l <br /> 7-1;1•even/Stockton 11 <br /> August 1990 <br /> Both of these wells were resampled in June, and <br /> analyses showed the concentrations of TPH-as-gasoline <br /> to be less than 1 ppb in both wells. <br /> o Maintained the groundwater treatment system, including <br /> monthly sampling and analyses of the groundwater- <br /> treatment system influent and effluent. <br /> a Wellheads for PW-2, MW-9, and MW-10 were upgraded with <br /> _ new equipment as expla..ned in the wellhead upgrade <br /> section of this report... Table 1 summarizes the well <br /> - data and status. <br /> GROUNDWATER MONITORING <br /> Monitoring of the groundwater elevation in the monitoring <br /> i <br /> wells was conducted three times during the reporting period, on <br /> ; :. April 4, May 1, and June 1, 1990. These monitoring data are <br /> presented in Table 3 (Appendix B) . Groundwater monitoring was <br /> performed in accordance -with Groundwater Technology Standard <br /> operating Procedure (SOP) 8 (Appendix C) . <br /> Analyses of the groundwater monitoring data indicated that <br /> s <br /> groundwater elevations have decreased an average of 1.28 feet <br /> during this three-month reporting period. The depth-to- <br /> groundwater at the site is approximately 44-feet below ground <br /> surface. The groundwater-table elevation is approximately <br /> 33-feet below mean sea level (MSL) . <br /> Since the first set of groundwater monitoring data were <br /> collected in May, 1986, lccal groundwater-table elF!'.ati,an has <br /> �. declined steadily. The decline in the groundwater levels is <br /> depicted in hydrographs for M11-7, MW-8, and MW-9 (Figure 4) . <br /> Tr.cw%ol.i Isc. <br />