Laserfiche WebLink
Five-Year Water-Quality Report November 17,2008 <br /> Neenah Paper FR LLC Ripon Mill Page 13 of 19 <br /> Text Figure 15 <br /> Nitrate in City of Ripon Production Wells- MW-2& MW 3 <br /> 70 <br /> 60 --- --- ------- --- <br /> 50 ---- - - -- ---- --- ---------- -- <br /> 3 � <br /> 40 ----- - - -- - - - -- - -- ----- - <br /> 30 -- --- -- - - - --- -------- <br /> 'z <br /> 20 -----` -- - - -- - --- -- - -- - -- - <br /> 10 `., <br /> 0 -I- —� <br /> Apr-01 Sep-02 Jan-04 May-05 Oct-06 Feb-08 <br /> Date <br /> -411- MW-2 MW-3 - MW-4 <br /> ACTIONS TAKEN TO REDUCE DISSOLVED SOLIDS IN GROUNDWATER <br /> The most recent action taken to reduce dissolved solids in groundwater beneath the site has been to <br /> import high-quality(TDS < 150 mg/L)water from the SSJID for spreading in the east percolation <br /> field. Spreading of low-TDS water was the corrective-action option chosen by NP to meet the Water <br /> Quality Protection Standard adopted by the CVRWQCB for the site(Table 2). The SSJID water <br /> was delivered by the City of Ripon by piping from their holding pond located on the north side of <br /> their MWWTF ponds. <br /> Between June 26 and August 16, 2007, and June 19 and September 8, 2008, approximately 136 and <br /> 137 acre-feet,respectively, of low (133 mg/L) TDS water was spread in NP's east percolation field <br /> and allowed to infiltrate into the subsurface. The east percolation field was chosen as the spreading <br /> area because it is located between a high TDS plume below ASB-2 and production wells PW-6 <br /> through PW-8. In addition to recharging the semiperched aquifer with low TDS water, the irrigation <br /> water had the additional benefit of reversing the groundwater gradient away from the production- <br /> well field, essentially creating a hydrologic barrier between ASB-2's TDS plume and the production <br /> wells. Improving the quality of water in the vicinity of the production wells ultimately improves the <br /> quality of water discharged by NP as effluent. <br /> 003044.02 Lawrence&Associates <br /> W:•ClientslFoxRiver-Neenah15 year review reportsU Year Review 2008Weenah_5YearReview Aug2008.doc <br />