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CALIFORNIA REGIONAL WATER QUALITY CONTROL 8DAR¢,Fa{.j{{ <br /> CENTRAL VALLEY REGIONV <br /> ORDER N0. CFP { PM 2; <br /> NPDES NO. CA0081787 <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> THE MARLEY COOLING TOWER COMPANY <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region, n <br /> (hereafter Board) finds that: <br /> 1. The Marley Cooling Tower Company, a wholly owned subsidiary of United <br /> Dominion Incorporated (hereafter Discharger) submitted a Report of Waste <br /> discharge, dated 2 August 1991 , and applied for a permit renewal to <br /> discharge waste under the National Pollutant Discharge Elimination System <br /> (NPOES) . Supplemental information to complete filing of the application was <br /> submitted on 28 October 1991 . <br /> 2. The Discharger is currently permitted to discharge up to 0.59 million <br /> gallons per day (mgd) of treated ground water and/or storm water runoff to <br /> the Stockton Diverting Canal , tributary to the Calaveras River, at a point <br /> approximately 1/4 mile east of the site in Section 32, T2N, R7E, MDB&M, as <br /> shown on Attachment A, incorporated herein and made part of this Order. <br /> 3. The Discharger owns a cooling tower fabrication plant in the East Stockton <br /> Area in San Joaquin County. As part of the fabrication operations, the <br /> Discharger operated a wood preservation process utilizing solutions <br /> containing copper, chromium and arsenic. <br /> 4. Wood preserving was discontinued at this facility in January 1991, however <br /> past operational practices have resulted in contamination of soils and <br /> ground water underlying the site. First ground water in 1988 was <br /> approximately 40 feet below ground surface in 1992 first ground water was <br /> approximately 80 feet below ground. The main contamination source was the <br /> Retort Pit, as shown on Attachment B incorporated herein and made part of <br /> this Order. Soils have been contaminated with copper, chromium, and <br /> arsenic; ground water has been contaminated with chromium and copper only. <br /> A ground water contamination plume exists with chromium concentrations up <br /> to 43,000 Ng/l under the site. This dissolved chromium plume extends over <br /> 5000 feet off-site exceeding drinking water standards and threatening local <br /> domestic and municipal supplies. The drinking water standard for chromium <br /> is 50 /pg/1 . <br /> 5. The Board, on 28 November 1984, ratified a Settlement Agreement between the <br /> Department of Health Services (now Department of Toxic Substances Control , <br /> DTSC) , the Discharger and the Board. The Settlement Agreement required the <br /> Discharger to conduct a Remedial Investigation / Feasibility Study (RI/FS) <br /> to define the extent of contamination, to develop a Remedial Action Plan <br />