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LK E/NFELDER <br /> &Ight leopk.N9M5olutbu <br /> ' 6. CONCLUSIONS AND RECOMMENDATIONS <br /> ' The conclusions and recommendations are derived from groundwater sampling <br /> activities at the California Natural Products facility located in Lathrop, California and are <br /> ' based on the activities conducted during the Fourth Quarter and throughout 2010. <br /> 6.1 CONCLUSIONS <br /> 1) During the fourth quarter 2011, the groundwater flow direction in the vicinity of the <br /> Plant Area was to the south with a gradient of 0.01 ft/ft. The flow direction in the <br /> McKinley Avenue Rapid Infiltration Area was estimated to be west. The gradient was <br /> not calculated due to near linear alignment of the wells. The groundwater flow <br /> direction in the Louise Avenue Application Area was calculated to be towards the <br /> west-southwest with a gradient of 0.004 ft/ft. These findings are generally <br /> consistent with past monitoring events. Throughout the year, the groundwater <br /> elevations and gradients appeared to be relatively consistent. <br /> ' 2) The groundwater quality in the McKinley Avenue Rapid Infiltration Area was <br /> generally consistent with historical results. The TDS concentrations were above the <br /> recommended SMCL (500 mg/I) in the upgradient well W-4, and above the SMCL <br /> ' upper limit (1,000 mg/1) in W-1 and W-5. Nitrate as N concentrations were above the <br /> MCL (10 mg/1) in two of the three McKinley area wells (W-1 and W-5). The ranges of <br /> the concentrations of the analytes detected in the McKinley Rapid Infiltration Area <br /> during 2011 were generally consistent with the results of 2009, with some slight <br /> improvements noted in well W-4. Total coliform organisms were detected in two of <br /> ' three wells (W-1 and W-4) in the McKinley area. Fecal coliform organisms were also <br /> detected in the same two wells during 2011. <br /> 3) The groundwater quality from the Louise Avenue Infiltration Areas was also <br /> generally consistent with historical results. The TDS concentrations were generally <br /> above the SMCL (500mg/1) in five of the six wells (L-1, L-2, L-3, L-5, and L-6), <br /> except that TDS concentrations of L-1 during the first, second, and fourth quarters <br /> were below the SMCL (500mg/1). The concentrations of nitrate as N were below the <br /> MCL and trends varied by well in 2010. TKN concentrations were detected in 12 out <br /> 101486.4/ST012R025 Page 17 of 20 February 1, 2012 <br /> Copyright 2012 Kleinfelder <br />