SITE INFORMATION AND CORRESPONDENCE

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ORDER NO. 5-00=119 -4- INFORMATION.SHEET GENERAL ORDER FOR DISCHARGE TO SURFACE WATERS, . OF GROUND WATER FROM CLEANUP OF PETROLEUM FUEL POLLUTION ATTACHMENT C the antidegradation provisions of 40 CFR 131.12 and State Water Resources Control Board Resolution No. 68-16. The Order provides for an increase in the volume and mass of pollutants discharged. The increase will not cause significant impacts on drinking Water supplies; agricultural supply, or aquatic life,which are the beneficial uses most likely affected by the discharge of total dissolved solids. The increase will not cause a long-term violation of water quality objectives. The increase in the discharge allows the discharger to cleanup.a contaminated groundwater source and the subsequent cleanup is considered to be a benefit to the people of the.State, These requirements require that, during the application phase and prior to discharge, a determination of whether the proposed discharge will cause or contribute to an exceedance to the water quality objectives. The Order does not specify how the prospective dischargers will achieve this receiving water limit and it is recognized dissolved solids are not readily amendable to conventional, cost effective treatment.If the proposed discharge causes the receiving water to increase concentrations in the receiving water above the water quality objective set forth by this Order(as determined by a comparison of upstream and downstream receiving.water monitoring stations) or would cause or contribute to the decrease of a beneficial use of the receiving water,than an individual permit will be necessary to develop site-specific objectives.The Discharger is required to submit calculations•demonstrating`compliance with the receiving water limitation as a part of their"Attachment A" application requirements. Applicable receiving water quality criteria are shown below for the constitutes covered`by this order along with the basis of consideration. Receiving water standards, however, are generally set at the detection limit based on Best Available Technology considerations and the anti- degradation policy of this Board. These values come from the staff report A Compilation of Water Quality Goals,March 1998 edition along with more recent information.These recommended limits are used to interpret. applicable Basin Plan water quality objectives for the protection of existing or potential sources of drinking water. Sources of drinking water are surface and ground waters that have the beneficial use of municipal and domestic supply(1vIUN), as.designated in the applicable Water Quality ' Control Plan(Basin Plan) or the State Water Quality Control Board's Policy,Resolution 88-63. Water quality objectives applicable to such waters include California drinking water MCLs and narrative objectives prohibiting toxicity and adverse taste and odors. Where available,numerical water quality limits are presented to implement each`ofthese objectives. The most stringent of the listed limits for each chemical would implement all three objectives. Objectives protective of aquatic life are included but were not found to be the most sensitive criteria or no criteria have been developed.