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REPORT OF WASTE DISCHARGE- APPENDIX D <br /> Diamond Pet Food Processors of Ripon,LLC June 30,2011 <br /> Report of Waste Discharge—Antidegradation Analysis Page 6 of 14 <br /> ON-SITE GROUNDWATER QUALITY <br /> During the past year,Neenah and then Diamond were still accepting, diluting, and disposing the <br /> brine stream from the adjacent cogeneration plant. Cogen brine is discharged to Diamond's clarifier <br /> where it is mixed with lower TDS water from production wells PW-6 through PW-8 before being <br /> discharged, in sequence, into aeration stabilization basins ASB-1 and ASB-2, and then pumped to <br /> irrigation and percolation fields around the site for disposal. In 2010, the maximum average <br /> monthly TDS concentration measured in discharge from ASB-2 was 643 mg/L (January), which is <br /> below the 713 mg/L water-quality protection standard(WQPS) for TDS established for the <br /> semiperched aquifer(Table D-1). <br /> Table D-1. Water Quality Protection Standards <br /> Parameter Units Semiperched I Upper Intermediate <br /> i Aquifer Aquifer I Aquifer <br /> Bicarbonate mg/L 307 482 315 <br /> .. ..... ...... ................. <br /> Calcium mg/L 51 209 : 49 <br /> Chloride mg/L 178 197 68 <br /> Electrical conductance I µmhos/cm I 1,242 I 1,580 I 760 <br /> Magnesium I mg/L I 26I 43I 8.8 <br /> Nitrate I mg/L I 4.3I 4.7I 5.7 <br /> ........................................ <br /> pH units 6.5-8.5 6.5-8.5 6.5-8.5 <br /> Potassium m /L 2.6 10 6.8 <br /> ......... .................... <br /> Sodium mg/L 184 89 100 <br /> Sulfate mg/L 111 : 150 : 31 <br /> Total dissolved solids mg/L 713 1,030 470 <br /> Currently, groundwater chemistry under portions of the site does not meet water-quality protection <br /> limits established for this site, although groundwater quality is continuing to improve. Figures 13, <br /> 14, and 15 show contour maps of TDS for the three aquifers, from October 2010 data. <br /> In October 2010, the highest onsite TDS in the semiperched aquifer was measured in wells located <br /> in and adjacent to the eucalyptus grove in the northeast quadrant of the site; in wells located around <br /> ASB-1, and wells located along the western property boundary. The area of lowest TDS was in the <br /> southeastern corner of the site along the Stanislaus River(Figure 13). <br /> The highest TDS levels in the upper aquifer were in wells M-11-A and TH-2 (820 to 917 mg/L). <br /> The area of lowest TDS was in the northwestern corner of the site in well TH-7 (59 µmhos/cm). All <br /> wells screened in the upper aquifer were in compliance with the WQPS of 1,030 µmhos/cm(Figure <br /> 14). <br /> 010070.00, Task I Lawrence&Associates <br /> w:I clients)diamond pet foods1010107.00-ripon rowdldiamondpet_rowdjune2011_draft.docx <br />