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NA <br /> r' ffim 1MMMKW==WM== <br /> i� <br /> i <br /> 7-Eleven/Stockton <br /> November 1990 5 <br /> r <br /> Since the groundwater monitoring wells were first monitored <br /> in May, 1986, the local groundwater-table elevation has declined <br /> steadily. The decline in the groundwater levels is depicted in <br /> the hydrograph for monitoring wells MW-7 MW-8 and MW-9 f•i <br /> 3) . Moni+Monitoring ' cgure <br /> g wells MW-7 and MW-8 are representative of the <br /> majority of the wells at the site. The one exception to the <br /> general water-level decline was the data from MW-9 which <br /> -. reflected a mounding of the groundwater surface due to a leaking <br /> water pipe at the rear sof the 7-Eleven Store. In April,, 1989, <br /> this leaking water pipe was repaired and the mounding condition <br /> has been corrected. <br /> According to National Weather Service local climatological <br /> data for the Stockton area, below-normal annual precipitation has <br /> been recorded for the past five years. However, in 1982 and 1983, <br /> �• just prior to this drought period, annual precipitation was <br /> almost twice normal . Therefore, the steady decline in the <br /> groundwater-table elevation may be in response to prolonged <br /> drought conditions combined with an abnormally-elevated <br /> groundwater level at the beginning of the monitoring period. <br /> During this reporting period, eight groundwater monitoring <br /> wells could not be monitored or sampled. A prolonged decline in <br /> water level has caused monitoring wells MW-2, MW-3, Mw-4, MW-5, <br /> MW-10, MW-12, and PW-2 to go dry. Monitoring well MW-6 is also <br /> no longer in service, since it was abandoned in September 1986 <br /> -- due to the reconstruction of Thornton Road. The well completion <br /> data and current status of the monitoring wells at the site are <br /> summarized on Table 1. <br /> GROUNDWATER <br /> _S TECHNOLOGI',11'C. <br />