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Five-Year Water-Quality Report November 17,2008 <br /> Neenah Paper FR LLC Ripon Mill Page 15 of 19 <br /> TABLE 3 <br /> Percentage Change in Concentration of <br /> Parameters in ASB-2 Effluent <br /> Parameter % Change From <br /> 2002 to 2008 <br /> Conductivity(µmhos/cm) -14% <br /> TDS(mg/L) -10% _ <br /> Chloride(mg/L) -21% <br /> Sulfate(mg/L) 0% <br /> Nitrate(mg/L) -76% <br /> Sodium(mg/L) -19% <br /> Calcium(mg/L) -8% <br /> Magnesium(mg/L) - -11% <br /> Potassium(mg/L) -� -13% <br /> Bicarbonate(mg/L) -20% <br /> pH(units) -5% <br /> EFFECTS OF FAaLITYDISCHARGE ON GROUNDWATER <br /> GROUNDWATER GRADIENT <br /> Figures 3, 4, and 5 show groundwater elevation contour maps for October 2007, for the <br /> semiperched,upper, and intermediate zones,respectively. The deep zone is not contoured, as there <br /> is only one monitoring well at the site for that zone. All groundwater elevation (and quality) data <br /> previously have been presented in quarterly monitoring reports, and will not be included here.4 <br /> Discharge of effluent from ASB-2 to the various irrigated/percolation areas on the site causes <br /> groundwater mounding in the semiperched zone(Figure 3). In general, groundwater mounding <br /> occurs beneath recently irrigated areas, especially in the central and northwestern parts of the site. In <br /> the northeastern part of the site,the groundwater gradient in the semiperched zone generally moves <br /> to the northeast. In the southwestern part of the site,the groundwater gradient in the semiperched <br /> zone is generally to the south, towards the Stanislaus River. In the southeastern corner of the site <br /> near the Stanislaus River,the groundwater gradient in the semiperched zone generally is to the north <br /> along the northeastern boundary of the site,reflecting recharge from the river. <br /> The direction of the groundwater gradient in the upper zone is somewhat similar to that in the <br /> semiperched zone, although it is also influenced by groundwater mounding beneath the wastewater <br /> ponds to the west(Figure 4). The upper zone in the central part of the site shows higher <br /> groundwater elevations,reflecting the groundwater mounding in the semiperched zone in that area. <br /> 4 For example,Lawrence&Associates,February 2008,Combined 2007 Annual Summary Report, 4th-Quarter 2007 <br /> Groundwater-Monitoring Report,And Preliminary Corrective Action Evaluation,Neenah Paper Company,Ripon, <br /> California. <br /> 003044.02 Lawrence&Associates <br /> W.•I Clients ToxRiver-NeenahU year review reportsl5 Year Review 2008Weenah_5YearReview Aug2008.doe <br />