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INFORMATION SHEET �r <br /> MAY 14 1993 <br /> SIMPSON INVESTMENT COMPANY NVIR©NMENTAL HEALTH <br /> SIMPSON PAPER COMPANY PERMIT/SERVICES <br /> RIPON MILL <br /> SAN JOAQUIN COUNTY <br /> The Simpson Lee Paper Company (owned by Simpson Investment Company, Seattle, <br /> Washington) operates a paper mill located within the city limits of Ripon, San <br /> Joaquin County. The Ripon Mill is a paper mill which manufactures several <br /> grades of fine papers from purchased pulp. The mill ' s maximum daily <br /> production rate is 280,000 lbs (127,272 kgs) of paper. <br /> Waste Discharge Requirements Order No. 77-286, NPDES No. CA0004006, adopted by <br /> the Board on 16 December 1977, prescribes requirements for the discharge of <br /> industrial wastewater and stormwater runoff from primary and secondary <br /> treatment facilities at the mill . Order No. 77-286 (NPDES CA0004006) was <br /> rescinded by Waste Discharge Requirements Order No. 83-001 , NPDES CA0004006, <br /> adopted by the Board on 28 January 1983. Order No. 83-001 expired on <br /> 1 February 1988. <br /> The Ripon Mill proposes to intermittently discharge a maximum 1.5 mgd of <br /> industrial wastewater from secondary treatment facilities to land. In <br /> addition, the mill will discharge a maximum 1.8 mgd (6,817,000 liters/day) of <br /> combined industrial wastewater and stormwater runoff from primary and <br /> secondary treatments to 90 acres (36.5 ha) . The mill facility occupies 228 <br /> acres. <br /> Prior to July 1975, the Ripon Mill discharged to the Stanislaus River <br /> continuously or intermittently. Since July 1975, the mill has been able to <br /> contain all wastewater on land. The Ripon Mill no longer discharges <br /> wastewater into the Stanislaus River. The discharge of wastewater to the <br /> Stanislaus River or any other surface water or drainage course is prohibited. <br /> The Ripon Mill has applied for the waste discharge requirements, covering a <br /> discharge of waste to land in place of their discharge to surface waters. The <br /> Ripon Mill has proposed several changes to reduce the amount of salts in their <br /> discharge. These changes include using a distillation process to concentrate <br /> water softener regeneration waste in order to make it acceptable as brine for <br /> commercial use off-site; altering the process chemistry to reduce alum <br /> consumption, and installing new water supply wells screened in an aquifer <br /> which have less dissolved salts. These changes should reduce the amount of <br /> salts in the final effluent to the percolation ponds, such that the level of <br /> salts in the discharge will not degrade water quality beneath the site. <br /> Ripon Mill ' s consultant, David A. Lawrence, C.E.G. 618, has certified that <br /> Ripon Mill discharge is not a designated waste. The Ripon Mill will conduct <br /> pond and ground water monitoring to confirm that the discharge is not <br /> impacting ground water. Additionally, Ripon Mill will be required to conduct <br /> a ground water study every five years to determine the effectiveness of the <br /> operational and wastewater management changes on reducing the amount of salts <br /> in the discharge and the overall impact to the aquifers below the site. <br /> RAE:lsb:5/11/93 <br />