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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 86-004 NPDES NO. CA0081787 WASTE DISCHARGE REQUIREMENTS FOR THE MARLEY COOLING TOWER COMPANY STOCKTON, SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1. The Marley Cooling Tower Company (hereafter Discharger) submitted a Report of Waste Discharge, dated 29 August 1985, to discharge waste under the National Pollutant Discharge Elimination System (NPDES). 2. The Discharger owns a cooling tower fabrication plant in Section 55, T2N, R7E, MOB&M, in the East Stockton Area, San Joaquin County (Attachment A). Wood treatment facilities are utilized in the Dischargers fabrication process. As a result, rainfall , which comes in contact with treated cooling tower components, becomes contaminated. The primary chemicals of concern are chromium, copper and arsenic. Chromium is also present at elevated levels in both the soil and ground water. Arsenic and copper have not been detected in ground water and appear to be isolated to the upper 10 feet of soil . 3. The Board, on 28 November 1984, ratified a Settlement Agreement between the Department of Health Services, the Discharger, and the Board which requires the Discharger to: define the extent of contamination, develop a mitigation plan, and implement all measures necessary to remediate existing site contamination. The Discharger will perform these tasks in accordance with the compliance time schedule contained in the agreement. 4. In order to facilitate the implementation of the mitigation plan, the contents of the storm water collection pond must be removed. Therefore, the Discharger proposes to discharge storm water from an ion exchange treatment system (Attachment 8) into the Stockton Diverting Canal , at a point 1/4 mile east of the site. The Stockton Diverting Canal enters the Calaveras River, a water of the United States. 5. The Discharger has implemented site improvements which will minimize the contaminants contained in the stormwater prior to treatment. The measures include: a) The installation of drip pads to collect any drops of preser- ving solution from treated wood after it has been removed from the retorts. Treating solution drips are collected and returned to work tanks for reuse; b) A covered treated wood storage facility has been erected and is in use. The Discharger plans to erect at least one more covered storage area for treated wood; and c) Discontinued use .of arsenic in the wood treatment solutions.