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Ms. Karen Niiya Page 3 <br /> Regional Water Quality Control Board-Central Valley Region <br /> October 28,2005 <br /> ANNUAL SUMMARY <br /> Since groundwater monitoring began in December 2004, groundwater flow directions have ranged from <br /> west to southwest, with average hydraulic gradients ranging from 0.0004 ft/ft to 0.0018 ft/ft. <br /> Groundwater flow directions and gradients are summarized in Table 1.Groundwater elevations at the <br /> site have ranged from 8.96 feet above mean sea level (MSL)to 11.39 feet MSL.Groundwater elevation <br /> data is summarized in Table 2. <br /> In December 2004,E. Coli and fecal coliform were detected in MW-20,MW-21 and MW-23.E. Coli <br /> and fecal coliform have not been detected in site wells since December 2004. Total coliform was <br /> reported in all six site wells in December 2004 and June 2005,but was not detected in any wells in <br /> March 2005. In the most recent sampling event,total coliform was only reported in MW-12(a <br /> background well) and MW-19(the most upgradient well). <br /> Elevated nitrate levels have been consistently reported in MW-12 and MW-19 since December 2005. <br /> Nitrate was reported in MW-20 in March and June 2005. All other wells have been non-detect for nitrate <br /> since monitoring began in December 2005. <br /> Analytical data for December 2004 through September 2005 is presented in Table 3 and summarized in <br /> Figure 3. <br /> CONCLUSIONS <br /> Coliform and nitrates have been reported in groundwater monitoring wells at the site.The highest levels <br /> of nitrates were reported in the background well (MW-12)and the most up-gradient well (MW-19). <br /> Based on background levels reported for MW-12 and up-gradient data reported for MW-19,the sewage <br /> treatment plant ponds have not impacted groundwater beneath the site. <br /> KAWp ssV2206� ]Vo maz]lnuitmionl PoWAQMM3 QTR 050VI�-3QMR05 Re n.roc <br />