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 9 of 17 Table 3. Water Quality Protection Standards Parameter Units Semiperched Upper Intermediate Aquifer , Aquifer Aquifer Bicarbonate mg/L 307 482 315 ............................. ............................. Calcium mg/L 51 209 49 Chloride mg/L 178 197 68 Electrical conductance µmhos/cm 1,242 1,580 760 Magnesium mg/L 26 43 8.8 Nitrate mg/L 4.3 4.7 5.7 pH units 6.5-8.5 6.5-8.5 6.5-8.5 Potassium mg/L 2.6 10 6.8 Sodium mg/L 184 : 89 100 Sulfate i mg/L 111 : 150 : 31 ........................................................................................... Total dissolved solids mg/L 713 1,030 470 The highest TDS level in the intermediate aquifer was across the central part of the site and in the northeast quadrant of the site in PW-5 (1,100 µmhos/cm). The area of lowest conductivity was in the northwest quadrant of the site in well M-11-C 1 (130 mg/L; Figure 15). Infiltration of plant process water is suspected to be responsible for the elevated TDS levels measured in the semiperched,upper, and intermediate aquifer over most of the site. The elevated TDS levels in the semiperched aquifer in the northeastern quadrant of the site, however, which have been up to three times higher than effluent TDS levels, are likely caused by the eucalyptus trees' concentrating effect on TDS. The elevated TDS levels observed along the western portion of the site,particularly in the southwest corner of the site,probably reflect the infiltration of higher TDS water originating at the City of Ripon's MWWTF encroaching onto Diamond's site. STIFF PATTERNS OF WATER QUALITY Stiff patterns are graphic representations of water quality and are created by plotting the concentrations of anions and cations (in milliequivalents per liter; meq/L) in a sample on a horizontal axis and then connecting the dots to create a unique pattern for each well. Stiff patterns for all wells are presented in Figure 16. L&A's Five-Year Water-Quality Report, dated November 17, 2008, categorized all wells by their Stiff patterns to illustrate a progression from relatively undegraded groundwater to mill effluent. Semiperched zone well OB-16,upper zone well TH-5, and intermediate zone well TH-6 are the best examples of the least-degraded water-quality category. These wells are located in the southeast 7 G.S.Jorgensen,Kenneth H. Solomon,and V. Cervinka,March 1993,Agroforestry Systems for On-Farm Drain Water Management. 010107.00, Task I Lawrence&Associates w:Iclientsl diamond pet foods1010107.00-ripon rowdldiamondpet_rowdjune2011_draft.docx