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V <br /> Nas <br /> 4.0 GROUNDWATER SAMPLING <br /> Prior to groundwater sampling, each of the monitor wells was gauged, purged of at least <br /> three well volumes and measured in the field for pH, temperature, conductivity, turbidity, and <br />' dissolved oxygen Groundwater gauging results, which are presented in Table 2, were used to <br /> generate the potentiometric surface map (Figure 3), and are on the monitoring well field logs <br />' in Appendix C <br />' The potentiometnc surface had a gradient of 0 28 feet per 100 feet to the south The <br /> direction and gradient have remained consistent since gauging was initiated in June 1993. The <br /> potentiometrnc surface has, however, fluctuated by as much as 16 feet based on rainfall and <br /> recharge to the aquifer. The significant rise in the potentiometnc surface resulted in <br /> groundwater elevations above the screened interval in the monitor wells installed during drought <br />' conditions To determine if representative groundwater samples have been obtained in the past <br /> from monitor wells with the groundwater elevation above the screened interval, monitor well <br /> i MW-3A was installed adjacent to monitor well MW-3 At the time the monitor wells were <br /> installed, the wells were properly screened <br />' All purge water from the previous monitoring and sampling event (300 gallons) was <br />' properly disposed of by American Valley Environmental Services A copy of the receipt is <br /> included in Appendix C <br />' 5.0 GROUNDWATER ANALYTICAL RESULTS <br /> Groundwater analytical results for the July 25, 1996, sampling are depicted on Figure 4, <br /> presented in Table 3, and included in Appendix B Review of the groundwater analytical data <br /> 5 <br /> i <br />