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INFORMATION SHEET • 21 <br /> WASTE DISCHARGE REQUIRMENTS ORDER NO.R5-2002-0213 <br /> U.S.DEPARTMENT OF DEFENSE <br /> DEFENSE LOGISTICS AGENCY <br /> DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN <br /> SHARPE GROUNDWATER REMEDIATION SYSTEM <br /> SAN JOAQUIN COUNTY <br /> pH <br /> The Basin Plan provides that the pH (of surface waters) shall not be depressed below 6.5 nor raised <br /> above 8.5 pH Units. The Basin Plan further provides that changes in normal ambient pH levels <br /> shall not exceed 0.5 pH Units in fresh waters with designated COLD or WARM beneficial uses. <br /> Air strippers may influence the pH of groundwaters subsequent to treatment. This Order retains <br /> effluent and receiving water limitations and monitoring requirements for pH. <br /> Flow <br /> Previous Order 95-258 included an average daily flow limit of 1.152 mgd. The Discharger <br /> requested an increase in the average daily flow to 1.9 mgd to accommodate all design flows from <br /> all three GWTPs, including the Central Area treatment plant. This Order includes a new average <br /> daily flow limitation of 1.9 mgd, providing for an increase in the volume and mass of pollutants <br /> discharged. The permitted discharge is consistent with the antidegradation provisions of 40 CFR <br /> 131.12 and State Water Resources Control Board Resolution No. 68-16. The increase will not <br /> cause significant impacts on drinking water supplies, agricultural supply, or aquatic life, which are <br /> the beneficial uses most likely affected by the discharge. The increase in the discharge allows the <br /> discharger to clbanup a contaminated groundwater source and the subsequent cleanup is <br /> considered to be a benefit to the people of the State. This Order requires the Discharger to further <br /> evaluate the quality of the discharge and receiving waters, and determine whether the discharge <br /> will cause or contribute to an exceedance of water quality objectives. For bioaccumulative <br /> pollutants identified in the discharge(i.e. mercury),mass limitations have been established in this <br /> Order which are more restrictive than the previous Order. <br /> MLP/JME <br />