ARCHIVED REPORTS_COMBINED ANNUAL AND SECOND-HALF 2012 GROUNDWATER MONITORING REPORT 01-31-2013

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WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0105 6 DIAMOND PET FOOD PROCESSORS OF RIPON, LLC AND RIPON COGENERATION, LLC DIAMOND PET FOOD RIPON FACILITY SAN JOAQUIN COUNTY 23. Diamond will continue to manage the LAAs as Neenah did: the LAAs will be flood irrigated as needed to dispose of the treated wastewater by percolation. The RWD did not specify how the LAAs will be operated or how wastewater will be contained within the LAAs. This Order requires the Dischargers to appropriately operate the LAAs to prevent nuisance or wastewater runoff. 24. The RWD indicates that the WWTF has enough storage and disposal capacity for the storm water collected at the facility and approximately 700,000 gpd of the treated wastewater including dilution water. The application of 700,000 gpd of water over the 86 acres of LAAs equates to a daily application depth of 0.3 inches. Therefore, the flow limitations of this Order are based on the daily wastewater influent flows only (dilution water is not included) provided in the RWD as described in Finding No. 20. Site-Specific Conditions 25. Diamond obtains its source water from groundwater supply wells PW-6 through PW-8. Based on the 2010 Annual Monitoring Reports, the chemical character of the groundwater supply is summarized below. Groundwater Supply Supply TDS EC 61mhos/c Calcium Chloride Sodium Nitrate as pH Well m IL (mg m IL m IL N (mglL) Std. PW-6 480 698 44 53 89 3.7 7.7 PW-7 370 520 29 41 67 1.4 7.6 PW-8 380 553 25 54 77 2.4 8.0 EC= Electrical Conductivity. 26. Domestic wastewater from Diamond and Ripon Cogeneration, LLC is discharged to the City of Ripon's sewer system. 27. The facility site is in the Manteca Hydrologic Area (535.10) of the San Joaquin Valley Floor Hydrologic Unit, as depicted on the interagency hydrologic maps prepared by the Department of Water Resources in August 1986. 28. The site is located in the East San Joaquin groundwater Basin and is underlain by a sequence of Tertiary and Quatemary-aged continental deposits of the Tulare Formation. The deposits consist of interbedded sands/gravels and silts/clays or mixtures. 29. The nearest surface-water body is the Stanislaus River, which forms the southern boundary of the site. The site is relatively flat and level, with local topographic variations associated with the series of ponds and irrigation ditches. In general, the site slopes gently to the south (toward the Stanislaus River), with a steep slope at the southern edge of the site adjacent to the river. 30. The northern part of the Site is within the 500-year flood plain, and the southern edge along the Stanislaus River is within the 100-year floodplain, based on the Federal Emergency Management Agency's Flood Insurance. 31. The average annual precipitation is 13.09 inches per year and the 100-year, 365-day precipitation event is 23.67 inches. The mean reference evapotranspiration rate is approximately 51 inches per year.