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Diamond Pet Food Processors of Ripon California,LLC January 31,2013 <br /> Sampling and Analysis Plan Page 1 of 5 <br /> 1. INTRODUCTION <br /> This report constitutes a Sampling and Analysis Plan for groundwater monitoring at Diamond Pet <br /> Food Processors' (DP) Ripon facility, 942 South Stockton Avenue, Ripon, California(Figure 1). <br /> This report fulfills requirements set forth in Standard Provisions and Reporting Requirements, <br /> April 2000,for Waste Discharge Requirements for Discharges Regulated by Title 27 and/or <br /> Subtitle D (27 CCR §20005 et seq. and 40 CFR 258) issued by the California Regional Water <br /> Quality Control Board, Central Valley Region (CVRWQCB). <br /> 1.1 BACKGROUND <br /> The DP site is located next to the Stanislaus River in Ripon, California. There is an electric- <br /> power cogeneration plant adjacent to the Mill. <br /> Previously,both the paper mill and the cogeneration (cogen)plant were owned by Simpson Paper <br /> Company; now,however,the cogeneration plant is owned by Fort Chicago US Power Inc. The <br /> cogen plant contributes approximately 300,000 gallons of water containing approximately 1,000 <br /> mg/L TDS to DP's waste stream per day. <br /> Mill operations have been described in the Waste Discharge Requirements and other documents. <br /> Briefly, the Mill manufactured several grades of fine papers from purchased pulps. Process water <br /> was added to the pulps to make pulp slurry which is then made into paper. Effluent from this <br /> process, along with some regeneration brine from the cogen plant,was collected and discharged <br /> into a primary clarifier. Currently, only cogen brine and groundwater from PW-6 are discharged <br /> to the clarifier. <br /> Clarifier effluent is discharged into two aeration basins, in sequence (ASB-1 and ASB-2). The <br /> first pond, ASB-1, is approximately 14 feet deep and is lined; the second, ASB-2, is unlined and <br /> approximately 5 feet deep. Effluent from ASB-2 is pumped to irrigation and percolation fields <br /> around the site. <br /> Other ponds on the site (labeled Ponds 1 through 4) are unlined and used only to contain excess <br /> waste water in case of a system upset or a 100-year-or-greater storm event. <br /> Inert dewatered sludge from the clarifier and aeration basins was discharged to a lined sludge <br /> disposal area with a leachate-collection system. Leachate from the sludge pond is pumped back <br /> into the clarifier. The site also contains an inactive "closed" sludge disposal unit. <br /> 1.2 CURRENT STATUS <br /> DP purchased the paper mill from Neenah Paper in October 2010 and currently is in the process <br /> of converting the mill into a pet food manufacturing plant. The mill has not operated since May <br /> 22, 2009, at that time the effluent stream generated during paper production ceased. <br /> Fort Chicago US Power Inc., owns the adjacent 49.5 mega watt cogeneration plant (Cogen) <br /> which produces approximately 300,000 gallons of water containing 1,000 mg/L total dissolved <br /> solids (TDS)per day. Cogen brine is discharged to DP's clarifier where it historically was <br /> blended with lower TDS mill effluent before being discharged, in sequence, into two aeration <br /> basins ASB-1 and ASB-2 before being pumped to irrigation and percolation fields around the site <br /> for disposal. <br /> DP proposes using low TDS groundwater from production well PW-6 to dilute the Cogen brine to <br /> below the Water-Quality Protection Standard (WQPS) of 713 mg/L TDS established by the <br /> 010107.03 Lawrence&Associates <br /> W..•ICLIFNTMDiamond Pct Foods 1010107.01-Groundwater Monitoringl Groundwater Monitoring1201212012 Sampling and.4nalysis Plan.docx <br />