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WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0105 8 <br /> DIAMOND PET FOOD PROCESSORS OF RIPON, LLC AND <br /> RIPON COGENERATION, LLC <br /> DIAMOND PET FOOD RIPON FACILITY <br /> SAN JOAQUIN COUNTY <br /> Ripon's WWTF ponds. The City's WWTF treats up to 2.0 mgd and disposes of <br /> wastewater via percolation/evaporation ponds and land application area. <br /> 37. In general, the shallow groundwater flow direction is away from the mounding and then <br /> generally towards the north or northwest. The gradient in the first aquifer zone ranged <br /> between 0.001 and 0.003 feet/foot. <br /> 38. Shallow groundwater quality has been characterized by monitoring wells in the first <br /> aquifer zone since January 1992 (see Attachment B). Recent shallow zone groundwater <br /> monitoring data for key waste constituents from February 2007 through October 2011 are <br /> tabulated below. <br /> Groundwater Quality <br /> Average Average Average <br /> Average Average EC Chloride k Sodium Nitrate as <br /> Shallow Monitoring Wells TDS (m./c/LL) (umhos/cm) mg/L) ma1L] N (mg1L) <br /> (Potentially Applicable 500,1000, 900,1600, 250, 500, <br /> Water Quality Objective) 1500 2200 ' 600 ' 693 102 <br /> 013-1 993 1,600 172 209 7.1 <br /> 013-2 1,214 1,853 221 201 5.2 <br /> 013-4 1,449 2,145 293 278 0.2 <br /> 013-5 894 1,368 186 181 11.1 <br /> 013-7 1,165 1,779 240 207 10.2 <br /> 013-8 1,041 1,599 164 212 6.8 <br /> 013-11 1,009 1,649 240 179 0.2 <br /> OB-17 (background well) 151 228 4.6 16.5 X0.1 <br /> 013-19 800 1,230 140 143 3.5 <br /> OB-21 796 1,226 161 174 4.7 <br /> OB-22 680 1,047 133 168 0.1 <br /> OB-24 919 1,388 197 84 5.0 <br /> OB-25 1,066 1,596 252 112 3.7 <br /> OB-26 630 909 18.7 129 17.3 <br /> OB-28 1,199 1,787 152 118 41.4 <br /> Secondary MCL stated as a recommended level, upper level, and a short-term maximum level. <br /> 2_ Primary MCL. <br /> 3. Most stringent potentially applicable agricultural Water Quality Goal. <br /> Based on the data presented above and the background groundwater quality WQPSs <br /> established in the 2006, the previous discharge degraded groundwater quality with <br /> respect to TDS, sodium, chloride, and nitrate. Specifically, the highest average TDS was <br /> measured in Well OB-4, which is in the eucalyptus grove in the northeast quadrant of the <br /> site. Elevated TDS levels were also measured in wells located around ASB-1 and wells <br />