ARCHIVED REPORTS_RPT OF WASTE DISCHARGE FOR WASTEWATER DISPERSAL 2011

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REPORT OF WASTE DISCHARGE- APPENDIX D Diamond Pet Food Processors of Ripon,LLC June 30,2011 Report of Waste Discharge—Antidegradation Analysis Page 10 of 14 CONSTITUENTS OF CONCERN Constituents of Concern are represented mainly by the compounds that comprise total dissolved solids (salts), as listed in Table D-3. Table D-3. Constituents of Concern Analyte Reporting Units Bicarbonate mg/L Biological oxygen demand mg/L Carbonate mg/L Calcium mg/L Chloride mg/L Magnesium mg/L Nitrate(as N) mg/L Potassium mg/L Sodium mg/L Sulfate mg/L Total dissolved solids mg/L Specific conductance gs1cm Sodium mg/L Other compounds that may be imparted to the wastewater during the manufacturing process are more easily oxidized than salts, and would be eliminated through aeration in the two aeration basins immediately prior to discharge to irrigation fields. Specifically, organic compounds that are not consumed during processing, will be reduced to insignificant levels by aeration. Biological oxygen demand(BOD) also will be reduced by aeration; if BOD continues to be present with the existing aeration systems, additional aeration can be added to eliminate BOD in the wastewater that goes to the irrigation fields. WATER-QUALITY IMPACTS ANALYSIS POTENTIAL FOR IMPAIRMENT OF SURFACE WATERS The nearest surface-water body is the Stanislaus River, forming the southern boundary of the site. If the irrigation fields overflowed, the discharge would flow into the Stanislaus River. Historically, the irrigation fields have not overflowed into the river. Because the proposed maximum discharge is less than 20% of the volume of the previous discharge (maximum 455,000 gpd vs. 2,500,000 gpd previously) it is unlikely that the irrigation fields could not accommodate the combined Diamond/Cogen discharge. 010070.00, Task I Lawrence&Associates w:I clients)diamond pet foods1010107.00-ripon rowdldiamondpet_rowdjune2011_draft.docx