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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -3- WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -4- CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY SAN JOAQUIN COUNTY Discharge to land averages 2.0 mgd. 1 5-day,20°C biochemical oxygen demand 2 Based on 9.87 mgd Constituent Units Concentration Ibs/davz 3 0.5 mg/1 during certain low flow conditions Ranee average 4 Table 5,Basis of Design Report,August 2002 BOD' mg/1 6-124' 530 5 7-day mean Ammonia mg/1 12-33.8' 330 6 30-day maximum Nitrate mg/1 0-9.8 25 7 Daily Average Electrical Conductivity umhos/cm 946-1354' 8 Maximum anytime Total Dissolved Solids mg/1 557-614 9800 9 Revised to 8.0 per 17 October 2002 letter from City of Manteca 1 5-day,20°C biochemical oxygen demand A separate industrial collection system that was constructed earlier will deliver food 2 Based on 2.0 mgd processing waste to an aeration basin that will be separate from the main treatment plant prior 3 January 2002 to December 2002 monitoring reports 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: 4. The municipal treatment system capacity will be expanded through the addition of primary and secondary treatment units that will be similar to and parallel to the existing units. In addition, Constituent Units Concentration lbs/dav2 nitrification,denitrification,tertiary filtration,and UV disinfection will be added to improve the average average effluent quality. The expansion will include additional sludge digestion and dewatering units,as BOD' mg/1 143' 2400 well as improvements to buildings,pump stations,ponds,and chemical handling. Chemical Total Nitrogen mg/1 9' 150 additions of sodium hydroxide,lime,sodium hypochlorite,or similar products may be required to control pH,alkalinity and disinfection in the plant processes. Additional expansion of the 1 5-day,20°C biochemical oxygen demand municipal waste collection system is planned to support further development of the City. In 2 Based on 2.0 mgd order to mitigate thermal impacts of the discharge to the San Joaquin River,the treated 3 Wastewater Management Plan,August 2002 municipal wastewater will be discharged only during the outgoing tide. The Report of Waste Discharge describes the proposed City of Manteca discharge as follows: 5. The U.S.Environmental Protection Agency(USEPA)and the Regional Board have classified this discharge as a major discharge. Design Flow(dry weather): 9.87 mgd municipal sanitary waste Average Temperature: 81'F Summer;62°F Winter BENEFICIAL USES/WATER QUALITY CONTROL PLANS Constituent Units 30-Da3y Dailya jaLLaZ 6. The Regional Board adopted a Water Quality Control Plan,Fourth Edition,for the Sacramento Average Maximum average and San Joaquin River Basins(hereafter Basin Plan). The Basin Plan designates beneficial uses, BOD mg/1 10 50 820 establishes water quality objectives,and contains implementation programs and policies to Total Suspended Solids mg/1 10 50 820 achieve water quality objectives for all waters of the Basin. These requirements implement the Ammonia(as N) mg/1 2' 160 Basin Plan. Total Dissolved Solids mg/1 640 53,000 Total Organic Carbon mg/1 13 1100 7. The beneficial uses of the Delta downstream of the discharge as identified in Table II-1 of the Chlorine Residual mg/1 0.1 Basin Plan are municipal and domestic supply,agricultural irrigation,agricultural stock Settleable Matter m9/1 0.1 0.2 8 watering,industrial process water supply,industrial service supply,water contact recreation, Oil and Grease mg/1 10 15 820 other non-contact water recreation,warm freshwater aquatic habitat,cold freshwater aquatic Total Coliform Organisms MPN/100 ml 2.25 23' habitat,warm fish migration habitat,cold fish migration habitat,warm spawning habitat,wildlife NTU NTU units 27 10$ habitat,and navigation. pH pH units 6.5-8.09 8. The beneficial uses of the underlying ground water are municipal and domestic,industrial Footnotes next page service,industrial process and agricultural supply.