FIELD DOCUMENTS AND WORK PLANS 2000-2003

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INFORMATION SHEET • • 3 WASTE DISCHARGE REQUIRMENTS ORDER NO.R5-2002-XXXX MARLEY COOLING TOWER COMPANY STOCKTON, SAN JOAQUIN COUNTY pH: 7.0—7.5 (groundwater) Constituent Storm Water(mg/L, ppm) Groundwater (mg/L, ppm)) Total Chromium 1.0-3.0 0.16 - 14 Chromium VI 0.5 -2.5 0.16- 14 Copper 0.50-2.5 <0.01 Arsenic 0.05 -0.20 <0.1 Total Dissolved Solids (TDS) 500 - 650 Receiving Water The Upper Morman Slough drainage course originates from the Calveras River near Bellota. The Upper Morman Slough drainage course then flows west-southwest from Bellota, south of the Calaveras River. The Stockton Diverting Canal,which receives the discharge from Outfall 001, is an engineered drainage which re-connects Upper Mormon Slough to the Calaveras River on the east side of Stockton. From 1 October to 1 April each year,the East Stockton Water District dams the Calaveras River at its fork with Upper Mormon Slough, diverting flows through Upper Mormon Slough and the Stockton Diverting Canal. From 1 April to 1 October each year, flows are split between the Calaveras River and Upper Mormon Slough. A series of check dams are installed along the Calaveras River, Upper Mormon Slough, and the Stockton Diverting Canal to provide irrigation water for adjacent farmers. During this time, there are periods of limited or no flow in the Stockton Diverting Canal. Beneficial Uses The Basin Plan at page H-2.00 states that: "Existing and potential beneficial uses that currently apply to surface waters of the basins are presented in Figure II-1 and Table II-1. The beneficial uses of any specifically identified water body generally apply to its tributary streams." The Basin Plan does not specifically identify beneficial uses for the Stockton Diverting Canal, but the Basin Plan does identify present and potential uses for the Calaveras River,to which the Stockton Diverting Canal is tributary. The Basin Plan identifies the following existing beneficial uses of the Calaveras River, from New Hogan Reservoir to the Delta: municipal and domestic supply(MUN), agricultural supply(AGR) including both irrigation and stock watering; body contact recreation, canoeing and rafting, (REC- 1); and other non-body contact recreation(REC-2);warm freshwater habitat(WARM); cold freshwater habitat(COLD), warm and cold migration of aquatic organisms (MIGR), warm and cold habitat spawning, reproduction, and/or early development (SPWN); and wildlife habitat (WILD). Industrial process supply(PRO) and industrial service supply(IND) are identified as a potential beneficial uses. In addition, State Board Resolution No. 88-63, incorporated into the Basin Plan pursuant to Regional Board Resolution No. 89-056, requires the Regional Board to assign the municipal and domestic supply use to water bodies that do not have beneficial uses listed in Table II-1.