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WASTE DISCHARGE REQUOMENTS ORDER NO. R5-2004-00280 -4- CITY OF MANTECA, CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUINCOUNTY 1 5-day,20°C biochemical oxygen demand 2 Based on 9.87 mgd 3 0.5 mg/1 during certain low flow conditions 4 Table 5, Basis of Design Report,August 2002 5 7-day mean 6 30-day maximum 7 Daily Average 8 Maximum anytime 9 Revised to 8.0 per 17 October 2002 letter from City of Manteca A separate industrial collection system that was constructed earlier will deliver food processing waste to an aeration basin that will be separate from the main treatment plant prior to disposal to land. Discharge to land averages 2.0 mgd,which includes up to 0.55 mgd of food processing waste, and contains the following: Constituent Units Concentration lbs/da average avera e BOD' mg/l 143 3 2400 Total Nitrogen mg/1 9 3 150 1 5-day,20°C biochemical oxygen demand 2 Based on 2.0 mgd 3 Wastewater Management Plan, August 2002 5. The U.S. Environmental Protection Agency(USEPA) and the Regional Board have classified this discharge as a major discharge. BENEFICIAL USES/WATER QUALITY CONTROL PLANS 6. The Regional Board adopted a Water Quality Control Plan,Fourth Edition,for the Sacramento and San Joaquin River Basins (hereafter Basin Plan). The Basin Plan designates beneficial uses, establishes water quality objectives, and contains implementation programs and policies to achieve water quality objectives for all waters of the Basin. These requirements implement the Basin Plan. 7. The beneficial uses of the Delta downstream of the discharge as identified in Table H-1 of the Basin Plan are municipal and domestic supply, agricultural irrigation, agricultural stock watering, industrial process water supply, industrial service supply,water contact recreation, other non- contact water recreation,warm freshwater aquatic habitat, cold freshwater aquatic habitat,warm fish migration habitat, cold fish migration habitat,warm spawning habitat, wildlife habitat, and navigation. 8. The beneficial uses of the underlying ground water are municipal and domestic, industrial service, industrial process and agricultural supply.