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WASTE DISCHARGE REQU1.1VlENTS ORDER NO. R5-2004-0028 -2- <br /> CITY OF MANTECA, CITY OF LATHROP AND DUTRA FARMS <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> line is not in service. All waste is currently treated in the municipal treatment plant. The <br /> treatment system consists of raw influent bar screening, flow metering, and grit removal, <br /> followed by primary sedimentation, biofiltration, conventional activated sludge and secondary <br /> sedimentation. Secondary effluent is applied to agricultural fields at agronomic rates. Excess <br /> flows are chlorinated, dechlorinated and discharged to the San Joaquin River. Biosolids are <br /> dewatered by settling and evaporation and disposed of on-site by application to the City-owned <br /> property at agronomic rates. The discharger has requested the option to dispose of biosolids in a <br /> landfill in the future. The Report of Waste Discharge and additional reports provided by the <br /> discharger describe the current City of Manteca discharge as follows: <br /> Monthly Average Flow: 5.72 million gallons per day(mgd) <br /> Daily Peak Wet Weather Flow: 7.21 mgd <br /> Design Flow (dry weather): 6.95 mgd <br /> Average Temperature: 79.5°F Summer; 63.3°F Winter <br /> Discharge to the San Joaquin River (Outfall 001) averages 4.89 mgd with a maximum of <br /> 6.29 mgd. <br /> Constituent Units Concentration lbs/day' <br /> Range average <br /> BOD' mg/1 17 (avg)/59 (max)5 690 <br /> Total Suspended Solids mg/1 14 (avg)/31 (max)5 570 <br /> Ammonia mg/1 ND-42.8 3 720 <br /> Chloride mg/1 100-2303 5600 <br /> Electrical Conductivity umhos/cm 819-1300' <br /> Total Dissolved Solids mg/I 540-727 3 26,000 <br /> Aluminum mg/1 0.07-0.354 6.1 <br /> Iron mg/l 0.17-0.73 4 20 <br /> Manganese mg/1 0.013-0.12 4 2.0 <br /> Arsenic ug/1 11-14 4 0.5 <br /> Copper ug/1 7.4-13 4 0.4 <br /> Cyanide ug/1 1.5-314 0.2 <br /> Dibromochloromethane ug/I ND-1.2 4 0.02 <br /> Bromodichloromethane ug/1 1-3.5 4 0.08 <br /> 2,4,6-Trichlorophenol ug/1 ND-114 0.2 <br /> Bis(2- ug/1 0.9-7 4 0.16 <br /> ethylhexyl)phthalate <br /> Mercury ug/1 0.013-0.028 4 0.00077 <br /> 1 5-day,20°C biochemical oxygen demand <br /> 2 Based on 4.89 mgd <br /> 3 January 1998 to December 2002 monitoring reports <br /> 4 January 2002 to December 2002 data collection <br /> 5 Form 2A of the Report of Waste Discharge <br />