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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -7- WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -8-
<br /> CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS
<br /> WASTEWATER QUALITY CONTROL FACILITY WASTEWATER QUALITY CONTROL FACILITY
<br /> SAN JOAQUIN COUNTY SAN JOAQUIN COUNTY
<br /> 17. On 4 February 2003,the State Board adopted the 2002 California 303(d)list of impaired water
<br /> 15. With regard to surface water,the receiving water may exceed applicable water quality objectives bodies. The listing for the eastern portion of the Delta waterways includes the organo-phosphate
<br /> for certain constituents as described in this Order. However,this Order requires the discharger, pesticides(diazinon and chlorpyrifos),organo-chlorine Group A pesticides(including the
<br /> in accordance with specified compliance schedules,to meet requirements that will result in the organo-chlorine pesticides DDT,endrin aldehyde,and lindane),mercury,and unknown toxicity.
<br /> use of best practicable treatment or control of the discharge and will result in compliance with The listing for the San Joaquin River downstream of the discharge also includes organic
<br /> water quality objectives.Table 1 of the information sheet provides an analysis of the mass enrichment/low dissolved oxygen. These listings require review and assessment of effluent
<br /> loading to the receiving water for a number of constituents based on current operations and for quality to determine if applicable effluent limitations are necessary. The USEPA requires the
<br /> an expanded discharge flow following plant upgrades. This Order requires compliance with Regional Board to develop total maximum daily loads(TMDLs)for each 303(d)listed pollutant.
<br /> technology-based standards and more stringent water quality-based standards. In developing
<br /> effluent limitations,this Order allows the use of some of the assimilative capacity of the GROUNDWATER
<br /> receiving water based on the current performance of the discharger and is consistent with the
<br /> SIP. Where assimilative capacity is available in the receiving water,this Order does not 18. Monitoring of the groundwater must be conducted to determine if the discharge has caused an
<br /> authorize the full use of the assimilative capacity. This Order is consistent with California Water increase in constituent concentrations,when compared to background. The monitoring must,at
<br /> Code section 13263(b). Any further use of the assimilative capacity would not be consistent a minimum,require a complete assessment of groundwater impacts including an assessment of
<br /> with Resolution 68-16. Compliance with these requirements will result in the use of best all wastewater-related constituents which may have migrated to groundwater,the vertical and
<br /> practicable treatment or control of the discharge. The impact on existing water quality will be lateral extent of any degradation,and an analysis of whether additional or different methods of
<br /> insignificant. The total allowable discharge to surface water of 9.87 mgd has been increased treatment or control of the discharge are necessary to provide best practicable treatment or
<br /> from 6.95 mgd from the previous Order. The discharge is consistent with Resolution 68-16 and control to comply with Resolution 68-16. Economic analysis is only one of many factors
<br /> 40 CFR section 131.12 because this Order requires the discharger to meet requirements that will considered in determining best practicable treatment. If monitoring indicates that the discharge
<br /> result in best practicable treatment or control to assure that pollution or nuisance will not occur has incrementally increased constituent concentrations in groundwater above background,this
<br /> prior to allowing flows to increase. permit may be reopened and modified. Until groundwater monitoring is sufficient,this Order
<br /> contains Groundwater Limitations that allow groundwater quality to be degraded for certain
<br /> 16. With regard to groundwater,domestic wastewater contains constituents such as total dissolved constituents when compared to background groundwater quality,but not to exceed water quality
<br /> solids(TDS),specific conductivity,pathogens,nitrates,organics,and metals. The Discharger's objectives. If groundwater quality has been degraded by the discharge,the incremental change
<br /> use of unlined ponds and the application of wastewater and sludge to land may result in an in waste concentration(when compared with background)may not be increased. If groundwater
<br /> increase in the concentration of these constituents in groundwater. Some degradation of quality has been or may be degraded by the discharge,this Order may be reopened and specific
<br /> groundwater by the Discharger is consistent with Resolution 68-16 provided that: numeric limitations established consistent with Resolution 68-16 and the Basin Plan.
<br /> a. The degradation is limited in extent; 19. The discharge authorized herein and the treatment and storage facilities associated with the
<br /> b. The degradation after effective source control,treatment,and control is limited to waste discharge of treated municipal wastewater,except for discharges of residual sludge and solid
<br /> constituents typically encountered in municipal wastewater as specified in the waste,are exempt from the requirements of Title 27,CCR,Section 20005 et seq.(hereafter
<br /> groundwater limitations in this Order; Title 27). The exemption,pursuant to Title 27,CCR,Section 20090(a),is based on the
<br /> c. The Discharger minimizes the degradation by fully implementing,regularly following:
<br /> maintaining,and optimally operating best practicable control technology(BPCT)
<br /> measures;and a. The waste consists primarily of domestic sewage and treated effluent;
<br /> d. The degradation does not result in water quality less than that prescribed in the Basin
<br /> Plan,e.g.,does not exceed water quality objectives. b. The waste discharge requirements are consistent with water quality objectives;and
<br /> As further discussed in Findings 18-20 and in the Provisions,the discharge to land authorized by c. The treatment and storage facilities described herein are associated with a municipal
<br /> this Order must comply with ground water limitations,groundwater monitoring requirements, wastewater treatment plant.
<br /> and a schedule to evaluate whether the Discharger is implementing best practicable treatment or
<br /> control of the discharge. Compliance with this Order will result in use of best practicable 20. This Order requires the Discharger to prepare technical and monitoring reports as authorized by
<br /> treatment or control and will not further degrade the groundwater. California Water Code(CWC)Section 13267. This Order also requires that the Discharger
<br /> conduct groundwater monitoring and includes a regular schedule of groundwater monitoring in
<br /> the attached Monitoring and Reporting Program. The groundwater monitoring reports are
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