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 2 of 7 Table 2 Water Quality Protection Standards COC Semiperched Aquifer Upper Aquifer Intermediate Aquifer Bicarbonate 307 mg/L 482 mg/L 315 mg/L Calcium 51 mg/L 209 mg/L 49 mg/L Chloride 178 mg/L 197 mg/L 68 mg/L Sc 1242 ttmhos/cm 1580 mhos/cm 760 mhos/cm Magnesium 26 mg/L 43 mg/L 8.8 mg/L Nitrate 4.3 mg/L 4.7 mg/L 5.7 mg/L H 6.5-8.5 6.5-8.5 6.5-8.5 Potassium 2.6 mg/L 10 mg/L 6.8 mg/L Sodium 184 mg/L 89 mg/L 100 mg/L Sulfate 111 mg/L 150 mg/L 31 mg/L TDS 713 mg/L 1030 mg/L 470 mg/L Notes: COC=constituents of concern. SC=Specific conductance. TDS=Total dissolved solids. Corrective Action Evaluation Groundwater quality has continued to improve across the southeast and central portions of the NP site as the result of(1)recharging the semiperched aquifer underlying the east percolation field with low TDS surface water during the irrigation seasons of 2007 and 2008 and with low TDS groundwater during the 2009 irrigation season; and(2) discontinuing paper production at the mill that has reduced TDS loading to the semiperched aquifer by 3,676 pounds per day based on average 2008 mill production. In order to meet the WQPS adopted by the CVRWQCB for the site (Table 2), NP chose to import low TDS (total dissolved solids) South San Joaquin Irrigation District (SSJID) water as the preferred corrective action method for reducing TDS levels in Plant effluent water and groundwater beneath the site.1,2 The water was provided by the City of Ripon and piped from their holding pond located on the north side of their municipal waste water treatment facility (MWWTF) ponds. Groundwater-quality modeling predicted that the application of low (<150 mg/L) TDS water in the east percolation field would improve (lower) TDS levels by 100 to 500 mg/L, depending on the location in the subsurface, over a five year time period. Between June 26 and August 16, 2007, approximately 135.6 acre feet (44 million gallons) of low (133 mg/L) TDS water were pumped into NP's east percolation field and allowed to infiltrate into the subsurface. The east percolation field is located between a high TDS plume originating from the bottom of Aeration Stabilization Basin (ASB)-2 and production wells PW- 6 through PW-8. In addition to recharging the semiperched aquifer with low TDS water, the 'L&A,June 15,2005,Amended Report of Waste Discharge For Disposal Of Plant Effluent Water. 2 L&A,March 31,2006,Addendum To Amended Report of Waste Discharge For Disposal Of Plant Effluent Water. 005194.04 Task 4 Lawrence&Associates W.•I CLIENTSIFoxRiver-NeenahlQuarterlyMonitoringl201011st half 2010 reporkdoc