SITE INFORMATION AND CORRESPONDENCE_1993-2003

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• i INFORMATION SHEET q WASTE DISCHARGE REQUIRMENTS ORDER NO. R5-2002-0213 U.S. DEPARTMENT OF DEFENSE DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE GROUNDWATER REMEDIATION SYSTEM SAN JOAQUIN COUNTY beneficial uses may apply to the SSJID Canal, the Regional Board has considered the following facts: a. Domestic and Municipal Supply As noted above, the Basin Plan does not specifically identify beneficial uses for the SSJID Canal. For Surface Waters at page II-2.00 the Basin Plan states: "Water Bodies within the basins that do not have beneficial uses designated in Table II-1 are assigned MUN designations in accordance with the provisions of State Water Board Resolution No. 88-63, which is,by reference, a part of this Basin Plan." The Basin Plan further states: "In making any exemptions to the beneficial use designation of MUN, the Regional Board will apply the exceptions listed in Resolution 88-63...". The State Water Resources Control Board (SWRCB) Sources of Drinking Water Policy, Resolution No. 88-63 states that"All surface and ground waters of the State are considered to be suitable, or potentially suitable, for municipal or domestic water supply and should be so designated by the Regional Boards with the exception of:...2. Surface waters where: ...b. The water is in systems designed or modified for the primary purpose of conveying or holding agricultural drainage waters,provided that the discharge from such systems is monitored to assure compliance with all relevant water quality objectives as required by the Regional Boards." The SSJID Canal is a`waters of the State" and, therefore, is subject to Resolution 88-63. From the point of effluent discharge from the DDJC-Sharpe outfall, water in the SSJID Canal flows northward in a channel which is primarily earthen lined, but concrete lined in certain areas. No domestic or municipal supply water intakes have been observed along the length of the channel. Based on available information, the Regional Board finds that municipal and domestic supply is not an existing or likely future beneficial use of the SSJID Canal and that it would be appropriate to consider de-designating the beneficial use of MUN for the SSJID Canal. The Regional Board has not established water quality objectives specific to the SSJID Canal. This Order requires the Discharger to monitor the quality of water in the SSJID Canal up and down stream of the discharge, and also monitor the quality of water in French Camp Slough up and down stream of the confluence with the SSJID Canal. With the exception of arsenic, this Order establishes effluent and receiving water limitations that are protective of MUN in the SSJID and French Camp Slough. With respect to arsenic, this Order establishes a receiving water limit that protects MUN in French Camp Slough and establishes interim effluent limitations for the discharge to the SSJID Canal and requires a study to evaluate whether additional protection is needed., The Discharger may also provide information to the Regional Board to support a Basin Plan amendment to de- designate MUN based on the exceptions to Resolution 88-63.