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RECEIVE MAY 14 1993 CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARP4VIRC)NWNTAL HEALTH ORDER NO. PERMIT/kRvicE WASTE DISCHARGE REQUIREMENTS FOR SIMPSON INVESTMENT COMPANY AND SIMPSON PAPER COMPANY RIPON MILL SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: N anP y p n Paper Company, Ripon M�111 . Simpson Investment Com and Sim so (hereafter Discharger) submitted a Report of Waste Discharge, dated 31 July 1987, to discharge waste under the National Pollutant Discharge Elimination System. The Discharger has not discharged any wastewater to the Stanislaus River in the past seventeen years and no longer proposes to discharge to the Stanislaus River in the future. Therefore, NPDES Permit No. CA0004006, which expired on 1 February 1988, will not be renewed. The Discharger proposes the continued discharge of wastewater to on-site ponds and adjacent percolation fields. 2. The Discharger operates a paper mill in Section 29, T2S, R8E, MDB&M (see Attachment A which is hereby made part of this Order) . The Discharger discharges a maximum 1.8 mgd (6,817,000 liters/day) of combined treated A industrial wastewater and stormwater runoff to 90 of 228 acres owned by Simpson Paper Company (APN No. 259-340-01 and 259-340-02) for disposal by percolation and nonagricultural irrigation. Domestic waste is sewered to the City of Ripon wastewater treatment facilities. 3. The Discharger manufactures several grades of fine papers from purchased pulps which includes virgin bleached pulp, deinked post-consumer waste, and waste paper (secondary fiber) . The mills maximum daily production rate is 280,000 lbs of paper. Process water is added to bales of pulp to make a pulp slurry wh ch is made into paper. Dyes , starches, inorganic fillers, such as clay and titanium dioxide rosin and alum, are also added to the slurry during the papermaking process. The water that drains from the paper ("white water") , is recycled to be used in the makeup of additional pulp slurry. The "white water" holding tank and stock chests are dumped when colors are changed which may be as often as 2 to 3 times per day. Periodically, (once a month) the entire paper machine system is cleaned ("boiled out") with a caustic solution. The /] spent caustic is commingled with other mill effluent and discharged to \\// the clarifier. Wastewater effluent to the clarifier from the V papermaking process averages 1.0 - 1.2 mgd. 4. Regeneration brine from the cogeneration plant water softeners and the mill effluent are collected in a sump and discharged into a circular primary clarifier. The clarifier effluent is discharged into two aeration stabilization basins (ASB) in series (see Attachment B which is hereby made part of this Order) . The first ASB #1 is a 14-foot deep lined basin converted from an abandoned sludge pit. The second ASB #2 is an unlined 5-foot deep basin. Effluent from ASB #2 is disposed of