ARCHIVED REPORTS_SECOND HALF AND ANNUAL 2010 GW MONITORING RPT

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Diamond Pet Food Processors of Ripon California,LLC Januarn 28,2011 Sampling and Analysis Plan Page 1 of 9 1. INTRODUCTION This report constitutes a Sampling and Analysis Plan for groundwater monitoring at Diamond Pet Food Processors' (DP) Ripon facility, 942 South Stockton Avenue, Ripon, California(Figure 1). This report fulfills requirements set forth in Standard Provisions and Reporting Requirements, April 2000,for Waste Discharge Requirements for Discharges Regulated by Title 27 and/or Subtitle D (27 CCR §20005 et seq. and 40 CFR 258) issued by the California Regional Water Quality Control Board, Central Valley Region (CVRWQCB). 1.1BACKGROUND The DP site is located next to the Stanislaus River in Ripon, California. There is an electric- power cogeneration plant adjacent to the Mill. Previously,both the paper mill and the cogeneration (cogen) plant were owned by Simpson Paper Company; now, however, the cogeneration plant is owned by Fort Chicago US Power Inc. The cogen plant contributes approximately 300,000 gallons of water containing approximately 1,000 mg/L TDS to DP's waste stream per day. Mill operations have been described in the Waste Discharge Requirements and other documents. Briefly, the Mill manufactured several grades of fine papers from purchased pulps. Process water was added to the pulps to make pulp slurry which is then made into paper. Effluent from this process, along with some regeneration brine from the cogen plant, was collected and discharged into a primary clarifier. Currently, only cogen brine and groundwater from PW-6 are discharged to the clarifier. Clarifier effluent is discharged into two aeration basins, in sequence (ASB-1 and ASB-2). The first pond, ASB-1, is approximately 14 feet deep and is lined; the second, ASB-2, is unlined and approximately 5 feet deep. Effluent from ASB-2 is pumped to irrigation and percolation fields around the site. Other ponds on the site (labeled Ponds 1 through 4) are unlined and used only to contain excess waste water in case of a system upset or a 100-year-or-greater storm event. Inert dewatered sludge from the clarifier and aeration basins was discharged to a lined sludge disposal area with a leachate-collection system. Leachate from the sludge pond is pumped back into the clarifier. The site also contains an inactive "closed" sludge disposal unit. 1.2 CURRENT STATUS DP purchased the paper mill from Neenah Paper in October 2010 and currently is in the process of converting the mill into a pet food manufacturing plant. The mill has not operated since May 22, 2009, at that time the effluent stream generated during paper production ceased. Fort Chicago US Power Inc., owns the adjacent 49.5 mega watt cogeneration plant (Cogen) which produces approximately 300,000 gallons of water containing 1,000 mg/L total dissolved solids (TDS) per day. Cogen brine is discharged to DP's clarifier where it historically was blended with lower TDS mill effluent before being discharged, in sequence, into two aeration 010107.01 Lawrence&Associates N':ICLIENTSIDianimd Pet Foods1010107.91-Gromtdwater MonitoiingIGrnmtdivater MonitoringLOl olSa,npling and Anatvsis Platutoex