FIELD DOCUMENTS AND WORK PLANS 1988

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CALIFORPA REGIONAL WATER QUALITY CONTRh� BOARD CENTRAL VALLEY REGION ORDER NO. 88-124 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 Uischarge elimination System (NPDES) . The Report of Waste Discharge was amended with a Technical Report dated March 1988. 2. The Technical Report presented operational data and requested revisions to the present effluent limitations. After review, the Board has determined that the requested revisions are appropriate and that the revised limitations will protect beneficial uses. 3. The discharge is presently regulated by Order No. 87-161 (NPDES No. CA0081787) , adopted by the board on 25 September 1987. 4. The Discharger is permitted to discharge up to U.37 million gallons per day (m9d) 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, MUB&M, as shown on Attachment A, incorporated herein and made part of this Urder. 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 con- taining 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;