SITE INFORMATION AND CORRESPONDENCE CASE 2

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KLE/NFELDER MghfO Ple Xi9hl Salutionf. 5. CONCLUSIONS AND RECOMMENDATIONS The conclusions and recommendations are derived from groundwater sampling activities at the California Natural Products facility located in Lathrop, California and are based on the activities conducted during the First Quarter 2012. The following conclusions are a summary of the notable groundwater characteristics. 5.1 CONCLUSIONS ' 1) During the first quarter 2012, the groundwater flow direction in the vicinity of the Plant Area was to the south, with a gradient of 0.005 ft/ft. The groundwater flow direction in the Louise Avenue Application Area was calculated to be towards the west, with a gradient of 0.008 ft/ft. The groundwater flow direction in the McKinley Avenue area was estimated to be towards the west and not calculated due to the new linear orientation of the wells. These findings are generally consistent with past monitoring events. 2) The groundwater quality in the McKinley Avenue Area was generally consistent with historical results. The TDS concentrations ranged from 700 to 910 mg/L. The TDS concentrations were above the recommended SMCL (500 mg/1) in all McKinley Avenue Area wells sampled. Nitrate as N concentrations were above the MCL (10 mg/I) in one of the three McKinley area wells (W-5). Total coliform organisms were detected in two of the three wells (W-4 and W-5) in the McKinley Avenue Area. Fecal coliform organisms were not detected in any of the wells. 3) The groundwater quality from the Louise Avenue Areas was also generally consistent with historical results. The concentrations of TDS were above the SMCL (500mg/1) in four of the six wells. The concentration of nitrate as N was below the MCL of 10 mg/L in three of the six wells. Total Coliform and Fecal coliform organisms were not detected in any of the wells. 101486.5/ST012R0385 Page 11 of 14 April 30, 2012 Copyright 2012 Kleinfelder