ARCHIVED REPORTS_FIRST QUARTER 2008 GROUNDWATER MONITORING REPORT

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Neenah Paper,Inc. First-Quarter 1008 Groundwater Monitoring Report Apri130,2008 Page 4 O(9 Recommendations It is recommended that the CVRWQCB reduce the monitoring frequency at this site from • quarterly to semiannual (once during the wet season and once during the dry season). This recommendation is based on previous analyses which indicate that groundwater quality beneath the site is relatively stable or only changing slowly through time as documented by years of quarterly groundwater-monitoring data. fourteen NP should once again import low TDS SSJID water during the 2008 irrigation season. NP should consider removal of the eucalyptus groves in order to eliminate their concentrating effect on groundwater TDS levels. Site Descriptions and Operations Neenah Paper, Inc. 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 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 ITh mg/L TDS to NP's waste stream per day. 000 Mill operations have been described in the Waste Discharge Requirements 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. The average TDS concentration of effluent exiting ASB-2 for 2006 was 788 mg/L. 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 is discharged to a lined sludgeate from the sludge pond is pumped back disposal area with aleachate-collection system. Leach 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 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. • 005194.01 Task 8 Lawrence &Associates C.'Wocuments and Seaingsldkirk OZONECOILoca!SettingsiTemporary Internet Fi(esl Content Ouaook195X54UJ.Aln Q2008 reportdoc