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INFORMATION SHEET 3 WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-XXXX DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY • All waste constituents to be discharged; • The background quality of the uppermost layer of the uppermost aquifer; • The background quality of other waters that may be affected; • The underlying hydrogeologic conditions; • Waste treatment and control measures; • How treatment and control measures are justified as best practicable treatment and control; • The extent the discharge will impact the quality of each aquifer; and • The expected degradation to water quality objectives. In allowing a discharge, the Board must comply with CWC section 13263 in setting appropriate conditions. The Board is required, relative to the groundwater that may be affected by the discharge, to implement the Basin Plan and consider the beneficial uses to be protected along with the water quality objectives essential for that purpose. The Board need not authorize the full utilization of the waste assimilation capacity of the groundwater(CWC 13263(b)) and must consider other waste discharges and factors that affect that capacity. Certain waste constituents in wastewater are not fully amenable to waste treatment and control and it is reasonable to expect some impact on groundwater. Some degradation for certain constituents is consistent with maximum benefit to the people of California at this facility because DDJC-Sharpe provides vital support to the security of the United States. The existing alternatives to on-site treatment/disposal of wastewater are considered more harmful to State waters, are currently infeasible, and/or are too costly. Furthermore, the quality of groundwater in the first aquifer zone is considered poor as it cannot be used as a source of drinking water without treatment for naturally-occurring metals. This Order authorizes some degradation of groundwater consistent with the maximum benefit to the people of the state. Groundwater monitoring has not been conducted at the site for several constituents of concern in the discharge. Therefore, the most appropriate groundwater limits for a few constituents cannot be established at this time. In addition, certain aspects of waste treatment and control practices may not be justified as representative of best practicable treatment and control (BPTC). Reasonable time is necessary to gather specific information about the WWTF and the site to make informed, appropriate, long-term decisions. Therefore, this proposed Order establishes interim receiving water limitations to assure protection of the beneficial uses of groundwater of the State pending the completion of certain tasks and provides time schedules to complete specified tasks. The Discharger is expected to identify,implement, and adhere to, BPTC as individual practices are reviewed and upgraded in this process. During this.period, degradation may