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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -2- CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD SAN JOAQUIN COUNTY CENTRAL VALLEY REGION line is not in service. All waste is currently treated in the municipal treatment plant. The ORDER NO.R5-2004-0028 treatment system consists of raw influent bar screening,flow metering,and grit removal, followed by primary sedimentation,biofiltration,conventional activated sludge and secondary NPDES NO.CA0081558 sedimentation.Secondary effluent is applied to agricultural fields at agronomic rates. Excess flows are chlorinated,dechlorinated and discharged to the San Joaquin River. Biosolids are WASTE DISCHARGE REQUIREMENTS dewatered by settling and evaporation and disposed of on-site by application to the City-owned FOR property at agronomic rates. The discharger has requested the option to dispose of biosolids in a CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS landfill in the future. The Report of Waste Discharge and additional reports provided by the WASTEWATER QUALITY CONTROL FACILITY discharger describe the current City of Manteca discharge as follows: SAN JOAQUIN COUNTY Monthly Average Flow: 5.72 million gallons per day(mgd) Daily Peak Wet Weather Flow: 7.21 mgd The California Regional Water Quality Control Board,Central Valley Region,(hereafter Regional Design Flow(dry weather): 6.95 mgd Board)finds that: Average Temperature: 79.57 Summer;63.37 Winter BACKGROUND Discharge to the San Joaquin River(Outfall 001)averages 4.89 mgd with a maximum of 6.29 mgd. 1. The City of Manteca submitted a Report of Waste Discharge,dated 27 November 2001,and applied for a permit renewal to discharge waste under the National Pollutant Discharge Constituent Units Concentration lbs/day2 Elimination System(NPDES)from the Wastewater Quality Control Facility(WQCF). Range average Supplemental information to complete filing of the application was submitted on 14 March 2002, BOD' mg/1 17(avg)/59(max)5 690 5 September 2002,17 October 2002,20 May 2003,and 17 July 2003. Total Suspended Solids mg/1 14(avg)/31(max)5 570 Ammonia mg/1 ND-42.8 3 720 The City of Manteca's WQCF accepts wastewater flows from certain areas of the City of Chloride mg/1 100-2303 5600 Lathrop,therefore the City of Lathrop is named in this permit and is responsible for operation Electrical Conductivity umhos/cm 819-1300' and maintenance of its wastewater collection system. The City of Manteca leases 150 acres of Total Dissolved Solids mg/1 540-727 3 26,000 land from Dutra Farms(Assessor's parcel Nos.241-320-01 and 241-320-02)for application of Aluminum mg/1 0.07-0.35 4 6.1 treated wastewater;therefore Dutra Farms is named in this permit and is responsible for the Iron mg/1 0.17-0.73 4 20 proper application and management of the wastewater on its land. The City of Manteca is solely Manganese mg/1 0.013-0.12 4 2.0 responsible for the wastewater treatment facility. The City of Manteca,the City of Lathrop and Arsenic ug/1 11-14 4 0.5 Dutra Farms are hereafter individually and/or jointly referred to as Discharger. Copper ug/1 7.4-13 4 0.4 Cyanide ug/1 1.5-314 0.2 2. The Discharger owns and operates a wastewater collection,treatment,and disposal system,and Dibromochloromethane ug/1 ND-1.2 4 0.02 provides sewerage service to the City of Manteca and the City of Lathrop. The WQCF is in Bromodichloromethane ug/1 1-3.5 4 0.08 Section 4,T2S,R6E,MDB&M,as shown on Attachment B,apart of this Order. The existing 2,4,6-Trichlorophenol ug/1 ND-11 4 0.2 treatment plant is on property owned by the City of Manteca. Land disposal of effluent is Bis(2- ug/1 0.9-7 4 0.16 maximized by discharging effluent at agronomic rates seasonally to existing City-owned ethylhexyl)phthalate property,and additional leased property as shown on Attachment A,a part of this Order. Excess Mercury ug/1 0.013-0.028 4 0.00077 flow of treated municipal wastewater is discharged to the San Joaquin River,a water of the United States,and part of the Sacramento-San Joaquin Delta(Delta)at the point,latitude 37°, 1 5-day,20°C biochemical oxygen demand 46',45"(deg,min,sec)and longitude 121°,18',00"(deg,min,sec). 2 Based on 4.89 mgd 3 January 1998 to December 2002 monitoring reports 3. The collection system consists of two main lines servicing the City of Manteca and one line for 4 January 2002 to December 2002 data collection the City of Lathrop. A separate industrial waste line has been constructed for collection of food 5 Form 2A of the Report of Waste Discharge processing waste so that it can be separately treated and disposed on land. The industrial waste