ARCHIVED REPORTS_RPT OF WASTE DISCHARGE FOR WASTEWATER DISPERSAL 2011

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Diamond Pet Food Processors of Ripon,LLC June 30,2011 Report of Waste Discharge Page 13 of 17 Figures 18 through 29 show the results of the groundwater modeling, for the three aquifers before and after the cogen ceases water-cooled operation. Note that the groundwater model shows results as concentration rather than mass. Figures 18, 19, and 20 show results for the end of the period in which Diamond and the cogen as a water-cooled facility will operate (six years, or 2017). This scenario assumes that the eucalyptus grove remains in place. In this scenario, about 455,000 gpd of wastewater with a TDS of about 803 mg/L is applied to the fields. The model predicts that most of the semiperched aquifer will be in compliance with the WQPS at the point of compliance (property boundary), except for the area of the eucalyptus grove (Figure 18). The upper aquifer is predicted to be in compliance with the WQPS (1,030 mg/L). The model predicts that the intermediate aquifer remains out of compliance with the WQPS (470 mg/L). Figures 21, 22, and 23 show results for 10 years after the cogen ceases operation as a water-cooled facility, and does not provide distilled water to Diamond for dilution. Figures 24, 25, and 26 show results for 10 years after the cogen ceases operation as a water-cooled facility, but does continue to provide distilled water to Diamond for dilution. Assuming no cogen distilled water to the Diamond operation, the discharge from ASB-2 would be about 159,000 gpd at a TDS of about 660 mg/L. For this scenario, the model predicts that the semiperched and upper aquifers would be in compliance with their respective WQPS (Figures 21 and 22). The model predicts that the intermediate aquifer would remain out of compliance with the WQPS,but the concentrations would be lower than with the cogen operating, with much of the aquifer beneath the site showing a TDS between 600 and 700 mg/L (as opposed to 700 to 800 mg/L with the cogen). Assuming that the cogen continues to provide distilled water to the Diamond operation, the discharge from ASB-2 would be about 217,500 gpd at a TDS of about 483 mg/L. For this scenario, the model predicts that the semiperched and upper aquifers would be in compliance with their respective WQPS (Figures 24 and 25). The model predicts similar results for the intermediate aquifer as with no distilled water from the cogen. Running the model for another 10 years with the cogen distilled water inflow shows continued improvement in the water quality in all aquifers (Figures 27 through 29). At the end of the 20 year modeling period, the semiperched aquifer shows a TDS of about 400 mg/L or less beneath the site, the upper aquifer shows TDS between 500 and 600 mg/L beneath most of the site, and the intermediate aquifer shows TDS of about 600 mg/L. Thus, the modeling predicts that,under the various scenarios modeled, the semiperched and upper aquifers would be in compliance with their respective WQPS, while the intermediate aquifer would 010107.00, Task I Lawrence&Associates w:Iclientsl diamond pet foods1010107.00-ripon rowdldiamondpet_rowdjune2011_draft.docx