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WASTE DISCHARGE REQAENTS ORDER NO.RS-2002-XXXX • 3 <br /> MARLEY COOLING TOWER COMPANY <br /> SAN JOAQUIN COUNTY <br /> plume. When cycling,primary groundwater extraction is alternated between the north zone and <br /> the area south of the site. Water extracted from the north zone has higher contaminant <br /> concentrations. During south zone pumping, the capacity of the treatment plant is not fully <br /> utilized unless supplemental waste sources are added. Flushing water may be added to <br /> supplement the groundwater contaminant concentrations. Additionally, when sufficient storm <br /> water is accumulated on the North Yard to justify treatment, the operator will manually initiate <br /> storm water treatment through the Andco system. Groundwater from selected wells will <br /> simultaneously be delivered to the ion exchange treatment system. <br /> 11. The Report of Waste Discharge (RWD) and previous information submitted by the Discharger <br /> describes the combined storm water and groundwater characteristics and the treatment system <br /> performance characteristics as follows: <br /> Monthly Average Flow: 0.72 million gallons per day(mgd) <br /> Daily Maximum Flow,Treatment Plant Capacity: 0.94 mgd <br /> Average Temperature: 68°F (groundwater) <br /> pH: 7.0—7.5 (groundwater) <br /> Constituent Storm Water(mg/L',pumZ) Groundwater(me/L,mmr) <br /> Total Chromium 1.0-3.0 0.16- 14 <br /> Chromium VI 0.5 -2.5 0.16- 14 <br /> Copper 0.50-2.5 < 0.01 <br /> Arsenic 0.05-0.20 <0.1 <br /> Total Dissolved Solids(TDS) 500-650 <br /> ' milligrams per Liter. <br /> Z parts per million <br /> 12. The U.S. Environmental Protection Agency(USEPA) and the Regional Board have classified <br /> this discharge as a minor discharge. <br /> 13. The Regional Board adopted a Water Quality Control Plan, Fourth Edition,for the Sacramento <br /> and San Joaquin River Basins (hereafter Basin Plan). The Basin Plan designates beneficial uses, <br /> establishes water quality objectives, and contains implementation programs and policies to <br /> achieve water quality objectives for all waters of the Basin. These requirements implement the <br /> Basin Plan. <br /> 14. The Upper Morman Slough drainage course originates from the Calveras River near Bellota. The <br /> Upper Morman Slough drainage course then flows west-southwest from Bellota, south of the <br /> Calaveras River. The Stockton Diverting Canal, which receives the discharge from Outfall <br /> 001, is an engineered drainage course which re-connects Upper Mormon Slough to the Calaveras <br /> River on the east side of Stockton. From 1 October to 1 April each year, the East Stockton <br /> Water District dams the Calaveras River at its fork with Upper Mormon Slough, diverting flows <br /> through Upper Mormon Slough and subsequently to the Stockton Diverting Canal. <br /> From 1 April to 1 October each year, flows are split between the Calaveras River and Upper <br /> Mormon Slough. A series of check dams are installed along the Calaveras River, Upper <br />