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INFORMATION SHEET <br /> WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0105 <br /> DIAMOND PET FOOD PROCESSORS OF RIPON, LLC AND <br /> RIPON COGENERATION, LLC <br /> DIAMOND PET FOOD RIPON FACILITY <br /> SAN JOAQUIN COUNTY <br /> Background <br /> Diamond Pet Food Processors of Ripon, LLC (hereafter Diamond) owns and operates the pet <br /> food processing facility and the associated wastewater treatment and disposal facility, as <br /> shown on Attachment A. Veresen, Inc. owns Ripon Cogeneration, LLC, whose neighboring <br /> power plant has historically discharged industrial wastewater to Diamond's wastewater <br /> treatment facility(WWTF). Diamond and Ripon Cogeneration, LLC are hereafter jointly <br /> referred to as "Dischargers" and are responsible for compliance with these WDRs. <br /> The Diamond plant site was formerly a paper mill, which was owned and operated by the <br /> Neenah Paper Fox River, LLC. The paper mill was closed in May 2009 and there has been no <br /> discharge of process wastes from the paper mill since then. However, Ripon Cogeneration, <br /> LLC continued to discharge industrial process waste to the wastewater treatment facility. <br /> In October 2010, Diamond purchased the site and has refitted the industrial paper mill plant to <br /> manufacture pet food. <br /> WDRs Order 5- 01-148, adopted by the Central Valley Water Board on 14 June 2001, <br /> prescribes requirements for the Neenah Paper Fox River LLC paper mill. The Order describes <br /> an average dry weather flow limit of 60 million gallons per month and a maximum daily flow <br /> limit of 2.5 million gallons per day(mgd). The purpose of this revision is to prescribe <br /> requirements for Diamond and Ripon Cogeneration, LLC and reduce the influent flow limit to <br /> 0.29 mgd as a monthly average. Therefore, Order 5- 01-148 will be rescinded and replaced <br /> with this Order. <br /> Previous Facility and Discharge <br /> Neenah manufactured several grades of fine papers from purchased pulps including virgin <br /> bleached pulp, deinked post-consumer waste, and waste paper. The paper mill's maximum <br /> daily production rate was 200 tons of paper. The wastewater generated from paper <br /> processing was applied to land on the mill property. Wastewater flows to the clarifier from <br /> Neenah and Ripon Cogeneration, LLC averaged 1.0 to 2.0 mgd. <br /> Ripon Cogeneration, LLC has historically discharged cooling tower blowdown and reverse <br /> osmosis (RO) reject brine from the neighboring cogeneration plant to the paper mill's <br /> wastewater treatment system under a long-term agreement with Neenah Paper Fox River, <br /> LLC. Ripon Cogeneration, LLC's wastewater flows recently ranged between 0.2 and 0.3 mgd <br /> with an average TDS concentration of 1,000 mg/L. In the past, Ripon Cogeneration, LLC's <br /> wastewater was blended with paper mill wastewater in the clarifier before land application. <br /> The overall blended and treated wastewater had an average total dissolved solids (TDS) <br /> concentration of 812 mglL in 2008 with a range between 682 mglL and 928 mg/L. Since the <br /> paper mill closed in May 2009, Ripon Cogeneration, LLC's cooling tower blowdown/RO reject <br />