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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 87-161 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, (here- after Board) finds that: 1. The Marley Cooling Tower Company (hereafter Discharger) submitted a Report of Waste Discharge, dated 27 February 1987, to discharge waste under the National Pollutant Discharge Elimination System (NPDES) . 2. The discharge is presently regulated by Order No. 86-004 (NPDES No ., CA0081787) , adopted by the Board on 24 January 1986. 3. The Discharger is presently permitted to discharge up to 0.0163 million gallons per day (mgd) of treated stormwater to the Stockton Diverting Canal , tributary to the Calaveras River, at a point approximately 1/4 mile east of the site in Section 32, T2N, R7E, MDB&M, as shown on Attachment A, incor- porated herein and made part of this Order. 4. The Discharger proposes to discharge up to 0.37 mgd of treated stormwater and/or ground water to the same outfall point. 5. The Discharger owns a cooling tower fabrication plant in the East Stockton Area in San Joaquin County. As part of the fabrication operations, the Discharger operates a wood preservation process utilizing solutions containing copper and chromium. In the past, arsenic was also used in the wood preservation solutions. 6. The site is divided into two areas, the North Yard and the South Yard. All wood treatment activities are conducted on the North Yard. Rain falling on the North Yard becomes contaminated when it contacts treated cooling tower components. This contaminated rainwater is collected in a storm drain system and discharged to the treatment plant in the northeast portion of the site (Attachment B) . Runoff from the South Yard is discharged directly to the local drainage ditch system. 7. The Discharger has implemented the following site improvements to minimize contamination in the stormwater prior to treatment: a. Installation of a collection system to recycle preserving solution spilled during wood treating operations; b. Construction of covered storage facilities for treated wood to prevent contact with stormwater; and c. Discontinued use of arsenic compounds in wood treatment solutions .