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Vz <br /> LAWRENCE <br /> & ASSOCIATES <br /> ENGINEERS & GEOLOGiSISFa 044.03 <br /> July 15, 2009 �� — -' <br /> F. <br /> Mr. Todd Del Frate JUL 1 7 2009 <br /> California. Regional Water Quality Control Board ENVIRON KENT FIEALTM <br /> Central Valley Region PERMIT/SERVICES <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, CA 95670-6114 <br /> Dear Mr. Del Frate: <br /> SUBJECT: POST-CLOSURE WORK PLAN FOR THE NEENAH PAPER <br /> MILL, RIPON, CALIFORNIA <br /> Introduction <br /> This letter is a work plan describing post-closure activities at the former Neenah Paper <br /> (NP) mill located at 942 South Stockton Avenue, Ripon, California. This work plan was <br /> requested by the California Regional Water Quality Control Board, Central Valley <br /> Region (CVRWQCB) in a letter to NP dated June 8, 2009 (attached). <br /> Current Mill Status <br /> NP has ceased paper production at the mill, and has no plans to resume operations of the <br /> paper mill, however NP is actively trying to sell the property and the future use of the site <br /> is undetermined at this time. The mill's final day of paper production was May 22, 2009. <br /> Now that the mill is not operating, the effluent stream generated during paper production <br /> has ceased. <br /> Fort Chicago US Power Inc., who owns the adjacent 49.5 megawatt cogeneration plant <br /> (Cogen), produces approximately 300,000 gallons of regeneration brine per day with an <br /> average total dissolved solid (TDS) concentration of 1,000 mg/L. Cogen brine is <br /> discharged to NP's clarifier outfall where it historically mixed with mill effluent of lower <br /> TDS content before being discharged, in sequence, into aeration basins ASB-1 and ASB- <br /> 2, and then being pumped to irrigation and percolation fields around the site for disposal. <br /> Cogen Brine Disposal <br /> NP proposes to continue combining the Cogen brine with groundwater from production <br /> well PW-6 before discharging the blended streams to the irrigation fields. <br /> The average 2008 TDS concentration for well PW-6 was 224 mg/L. Assuming PW-6 is <br /> pumped at a rate of 250 gallons per minute (gpm), 360,000 gallons of water per day could <br /> be blended with Cogen's 300,000 gallons of brine to produce 660,000 gallons of blended <br /> water with a TDS concentration of 577 mg/L which is well below the Water-Quality <br /> 3590 Iron Court 0 Shasta Lake, California 96019 0 (530)275-4800 fax(530)275-7970 0 www.lwrnc.com <br /> 2619 Forest Avenue Chico, California 95928 (530)343-8857 fax(530)343-8879 0 infoWwrnc.com <br />