Laserfiche WebLink
CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER NO. <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, <br /> Lo <br /> (hereafter Board) finds that: <br /> 1. The Marley Cooling Tower Company (hereafter Discharger) submitted a Report <br /> of Waste discharge, dated 2 August 1991, and applied for a permit renewal <br /> to discharge waste under the National Pollutant Discharge Elimination IJ 11 <br /> System (NPOES) . Supplemental information to complete filing of the <br /> application was submitted on 28 October 1991. <br /> 2. The Discharger is currently permitted to discharge up to 0.37 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 is approximately 40 <br /> feet below ground surface. The main contamination source was the Retort <br /> Pit, as shown on Attachment B incorporated herein and made part of this <br /> Order. Soils have been contaminated with copper, chromium, and arsenic; <br /> ground water has been contaminated with chromium and copper only. A ground <br /> water contamination plume with chromium concentrations up to 43,000 µg/l , <br /> extends off-site threatening local domestic and municipal supplies. The <br /> drinking water standard for chromium is SO µg/l . <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 Remedial Action Plan <br /> (RAP) and to implement all measures necessary to remediate existing site <br /> contamination. <br />