ARCHIVED REPORTS_FIRST-HALF 2010 GROUNDWATER MONITORING REPORT 07-27-2010

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Neenah Paper,Inc. July 27,2010 First-Half 2010 Groundwater-Monitoring Report Page 5 of 7 Site Descriptions and Operations Neenah Paper FR LLC. The NP 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 Mill and the Cogen plant were owned by Simpson Paper Company; now, however, the cogen 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 NP's waste stream per day. It should be noted that NP has no direct control of the operations of the Cogen plant or the quality or quantity of wastewater it receives from the cogen plant. Mill operations have been described in the WDR and other documents. Briefly, prior to its closure, the Mill manufactured several grades of fine papers from purchased pulps. Process water was added to the pulps to make a slurry which then was made into paper. Effluent from this process, along with some regeneration brine from the cogen plant,was collected and discharged into a primary clarifier. The mill ceased manufacturing paper on May 22, 2009, and has no plans for resuming operations. Now that the mill is idle, it no longer produces an effluent stream. Currently, the regeneration brine from the cogen plant still is discharged to the clarifier where it is blended with low TDS water from PW-6 before being 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. City of Ripon The City of Ripon operates a MWWTF adjacent to the southwest quadrant of the NP site. 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 currently under directive from the CVRWQCB to evaluate the impacts of effluent disposal on groundwater quality. Nestles Nestles USA formerly operated an instant coffee and tea processing plant, located approximately 2,000 feet north of the NP site, from 1948 through 1986. Solvents used in the decaffeination process, and their daughter products (trichloroethene, dichloroethene, and vinyl chloride)have impacted soils at the site and groundwater throughout the Ripon area. Nestles' consultant, Environmental Cost Management, currently operates two groundwater-treatment systems in the area to remediate the contaminant plumes. The plumes have impacted the upper and intermediate aquifers along the northern and western portions of the NP site. 005194.04 Task 4 Lawrence&Associates W.•I CLIENTSIFoxRiver-NeenahlQuarterlyMonitoringl201011st half 2010 reporkdoc