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Fox River Paper Compan* • September 30,2004 Addendum to 2003 Annual Groundwater-Monitoring Report Page 3 of 5 Sulfate All monitoring wells completed in the semiperched,upper, and intermediate aquifers met primary water-quality MCL of 250 mg/L for sulfate except well OB-2 which was below secondary water-quality MCL(upper limit) of 500 mg/L for sulfate (Figure 14). Chloride Wells OB-17, OB-20, OB-26, OB-27, TH-5, TH-6, TH-8, and TH-10 were below the primary water-quality MCL of 106 mg/L. All other monitoring wells completed in the semiperched, upper, and intermediate aquifers were below the secondary water-quality MCL of 250 mg/L for chloride (Figure 15). Site Descriptions and Operations Fox River The FR Paper Company is located next to the Stanislaus River in Ripon, California. There is an electric-power cogeneration plant adjacent to the Mill. Previously,both the Mill and the cogeneration (cogen) plant were owned by Simpson Paper Company; now, however, the cogeneration plant is owned by Tractebel Power, Inc. Mill operations have been described in the WDR and other documents. Briefly, the Mill manufactures several grades of fine papers from purchased pulps. Process water is added to the pulps to make a pulp slurry which is then made into paper. Effluent from this process, along with some regeneration brine from the cogen plant, is collected and discharged into a primary 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 wastewater in case of a system upset or a 100-year-or-greater storm event. Inert dewatered sludge from the clarifier and aeration basins is 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. City of Ripon The City of Ripon operates a municipal waste-water treatment facility(MWWTF) adjacent to the southwest quadrant of the FR. The MWWTF treats an average of 1,000,000 gallons of domestic effluent a day. The system consists of a series of clay lined ponds with surface mechanical aeration system to oxygenate the waste water. Treated effluent water is disposed by percolation from 45 acres of disposal ponds. The City is 003287.00, Task 9 Lawrence&Associates \\Powervault2\rhared\Clients\FoxRiver\QuarterlyMonitoring\2003\Addendum to 2003 Annual Report.doc