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WASTE DISCHARGE REQUIRAI TTS 2 <br /> CITY OF MANTECA AND CITY OF LATHROP <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> 5. The City's treatment process consists of raw influent bar screening, flow metering; and grit <br /> removal, followed by primary sedimentation, biofiltration, conventional activated sludge and <br /> secondary sedimentation. Secondary effluent is spread over agricultural fields and the excess <br /> flows are chlorinated, dechlorinated and discharged to the San Joaquin River. The Discharger is <br /> in the process of completing design work for the expansion of the treatment plant to <br /> accommodate increasing flows. At the completion of the proposed expansion the design flow <br /> will be 8.11 mgd. <br /> 6. The Report of Waste Discharge describes the existing discharge as follows: <br /> Average Flow 5.3 mgd <br /> Design Flow 6.95 mgd <br /> B.O.D: 13 mg/1 <br /> Suspended Matter: 11 mg/l <br /> 7. The U.S. Environmental Protection Agency (EPA) and the Board have classified this discharge <br /> as a major discharge. <br /> 8. The Board adopted a Water Quality Control Plan, Third Edition, for the Sacramento River <br /> Basin and the San Joaquin River Basin (hereafter Basin Plan)which contains water quality <br /> objectives for waters of the Basin. These requirements implement the Basin Plan. <br /> 9. Federal regulations require effluent limitations for all pollutants that are or may be discharged at <br /> a level that will cause or have the reasonable potential to cause, or contribute to an in-stream <br /> excursion above a narrative or numerical water quality standard. Based on information <br /> submitted as part of the application, in studies, and as directed by monitoring and reporting <br /> programs the Board finds that the discharge does have a reasonable potential to cause or <br /> contribute to an in-stream excursion above a water quality objective for BOD, Total Suspended <br /> Matter, Settleable Matter, Temperature, Dissolved Oxygen, Chlorine Residual, Total Coliform <br /> and Oil and Grease <br /> 10. The beneficial uses of the San Joaquin River downstream of the discharge are municipal and <br /> domestic, industrial, and agricultural supply,water contact and noncontact recreation; esthetic <br /> enjoyment; navigation; groundwater recharge, fresh water replenishment; hydropower <br /> generatioh; and preservation and enhancement of fish, wildlife and other aquatic resources. <br /> 11. The beneficial uses of the underlying groundwater are municipal and domestic, industrial, and <br /> domestic supply. <br /> 12. The State Water Resources Control Board (SvirRCB)Water Quality Control Plan for Control <br /> of Temperatures in Coastal and Interstate Waters and Enclosed Bays and Estuaries of California <br /> (the Thermal Plan dated 18 September 19975) is applicable to this discharge. Effluent <br />