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WASTE DISCHARGE REQU&MENTS ORDER NO. R5-2004-002* -7- CITY OF MANTECA, CITYATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY 15. With regard to surface water, the receiving water may exceed applicable water quality objectives for certain constituents as described in this Order. However, this Order requires the discharger, in accordance with specified compliance schedules, to meet requirements that will result in the use of best practicable treatment or control of the discharge and will result in compliance with water quality objectives. Table 1 of the information sheet provides an analysis of the mass loading to the receiving water for a number of constituents based on current operations and for an expanded discharge flow following plant upgrades. This Order requires compliance with technology-based standards and more stringent water quality-based standards. In developing effluent limitations, this Order allows the use of some of the assimilative capacity of the receiving water based on the current performance of the discharger and is consistent with the SIP. Where assimilative capacity is available in the receiving water, this Order does not authorize the full use of the assimilative capacity. This Order is consistent with California Water Code section 13263(b). Any further use of the assimilative capacity would not be consistent with Resolution 68-16. Compliance with these requirements will result in the use of best practicable treatment or control of the discharge. The impact on existing water quality will be insignificant. The total allowable discharge to surface water of 9.87 mgd has been increased from 6.95 mgd from the previous Order. The discharge is consistent with Resolution 68-16 and 40 CFR section 131.12 because this Order requires the discharger to meet requirements that will result in best practicable treatment or control to assure that pollution or nuisance will not occur prior to allowing flows to increase. 16. With regard to groundwater, domestic wastewater contains constituents such as total dissolved solids (TDS), specific conductivity,pathogens, nitrates, organics, and metals. The Discharger's use of unlined ponds and the application of wastewater and sludge to land may result in an increase in the concentration of these constituents in groundwater. Some degradation of groundwater by the Discharger is consistent with Resolution 68-16 provided that: a. The degradation is limited in extent; b. The degradation after effective source control, treatment, and control is limited to waste constituents typically encountered in municipal wastewater as specified in the groundwater limitations in this Order; c. The Discharger*minimizes the degradation by fully implementing, regularly maintaining, and optimally operating best practicable control technology(BPCT) measures; and d. The degradation does not result in water quality less than that prescribed in the Basin Plan, e.g., does not exceed water quality objectives. As further discussed in Findings 18-20 and in the Provisions, the discharge to land authorized by this Order must comply with ground water limitations, groundwater monitoring requirements, and a schedule to evaluate whether the Discharger is implementing best practicable treatment or control of the discharge. Compliance with this Order will result in use of best practicable treatment or control and will not further degrade the groundwater.