ARCHIVED REPORTS_SECOND HALF AND ANNUAL 2010 GW MONITORING RPT

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Diamond Pet Food Processors of Ripon California LLC Januan'28, 2011 Combined Annual and Fourth-Ouarter 2010 Groundwater Monitoring Report Page 4 of 8 wells) indicates that this water is less mineralized than that in other wells. River water is characterized by increasing relative percentages of magnesium+calcium and bicarbonate while mill effluent has been characterized by increasing relative percentages of sodium and chloride+sulfate.1 Figure 3 presents Stiff patterns for all wells in the DP network. The patterns illustrate that the best groundwater quality is in the southeast part of the site.and the most degraded groundwater quality is in the northeastern part of the site. As with analysis of groundwater quality contour maps, the poorest water quality in the northeast can be attributed to the concentration of constituents from evapotranspiration by the eucalyptus trees in this area.2 2nd-Half 2010 Groundwater Monitoring Third-quarter 2010 groundwater monitoring was performed on July 19, 2010 (Table 3 [following text]) and fourth-quarter monitoring was performed between October 11 and 14, 2010 (Table 4 [following text]). Third-Quarter 2010 Groundwater Monitoring Findings Mounding within the semiperched aquifer occurred onsite in the vicinity of the west percolation field and offsite north of the City of Ripon's municipal waste-water treatment facility (MWWTF) ponds and their fresh water infiltration pond. The direction of the groundwater gradient was away from the mounds then generally towards the north. The magnitude of the gradient ranged between 0.00097 and 0.0029 feet/foot (ft/ft; Figure 4). Mounding also was present in the upper aquifer in approximately the same general areas where mounding was observed in the semiperched aquifer. The direction of the groundwater gradient was away from the mounds, then generally towards the north. The magnitude of the gradient ranged between 0.00071 and 0,0011 ft/ft (Figure 5). Mounding within the intermediate aquifer was present in approximately the same general areas where mounding was observed in both the semiperched and upper aquifers. The direction of the groundwater gradient was away from the mounds, then generally towards the north. The magnitude of the gradient ranged between 0.0005 and 0.003 (Figure 6). Fourth-Quarter 2010 Groundwater Monitoring Findings Mounding within the semiperched aquifer occurred offsite in the vicinity of the City of Ripon's MWWTF ponds and their fresh water infiltration pond. The gradient was extremely flat across most of the DP site. The direction of the groundwater gradient was away from the mound then generally towards the north. The magnitude of the gradient ranged between 0.0031 and 0.0017 feet/foot (ft/ft; Figure 7). Mounding also was present in the upper aquifer in approximately the same general areas where mounding was observed in the semiperched aquifer. The direction of the groundwater gradient L&A,November 17,2008,Five-Year A'ater Quality Review Report. 'Ibid.P. 8 10107.01 Task 2 Lawrence&Associates OSICLIENTSIDiatond Pet FoodsI070107.01-Groundwater MaWwringlGroundwater Mon/toring1201012nd Ha/f_ ffiamata/-2nd Hatr 2010 repon.doe