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WASTE DISCHARGE REQU&MENTS ORDER NO. R5-2004-0020 -3- <br /> CITY OF MANTECA, CITYATHROP AND DUTRA FARMS <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> Discharge to land averages 2.0 mgd. <br /> Constituent Units Concentration lbs/da <br /> Ranee average <br /> BOD' mg/1 6-124 ' 530 <br /> Ammonia mg/1 12-33.8 3 330 <br /> Nitrate mg/l 0-9.8 25 <br /> Electrical Conductivity umhos/cm 946-1354 3 <br /> Total Dissolved Solids mg/1 557-614 3 9800 <br /> 1 5-day, 20°C biochemical oxygen demand <br /> 2 Based on 2.0 mgd <br /> 3 January 2002 to December 2002 monitoring reports <br /> 4. The municipal treatment system capacity will be expanded through the addition of primary and <br /> secondary treatment units that will be similar to and parallel to the existing units. In addition, <br /> nitrification, denitrification,tertiary filtration, and UV disinfection will be added to improve the <br /> effluent quality. The expansion will include additional sludge digestion and dewatering units, as <br /> well as improvements to buildings,pump stations,ponds, and chemical handling. Chemical <br /> additions of sodium hydroxide, lime, sodium hypochlorite, or similar products may be required <br /> to control pH, alkalinity and disinfection in the plant processes. Additional expansion of the <br /> municipal waste collection system is planned to support further development of the City. In <br /> order to mitigate thermal impacts of the discharge to the San Joaquin River,the treated municipal <br /> wastewater will be discharged only during the outgoing tide. The Report of Waste Discharge <br /> describes the proposed City of Manteca discharge as follows: <br /> Design Flow(dry weather): 9.87 mgd municipal sanitary waste <br /> Average Temperature: 81°F Summer; 62°F Winter <br /> Constituent Units 30-Dav4 Daibv lbs/da <br /> Average Maximum average <br /> BOD' mg/l 10 50 820 <br /> Total Suspended Solids mg/1 10 50 820 <br /> Ammonia(as N) mg/1 23 160 <br /> Total Dissolved Solids mg/1 640 53,000 <br /> Total Organic Carbon mg/1 13 1100 <br /> Chlorine Residual mg/l 0.1 <br /> Settleable Matter mg/1 0.1 0.2 8 <br /> Oil and Grease mg/l 10 15 820 <br /> Total Coliform Organisms MPN/100 ml 2.25 236 <br /> NTU NTU units 27 108 <br /> pH pH units 6.5-8.09 <br /> Footnotes next page <br />