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INFORMATION SHEET <br /> GENERAL ORDER FOR DISCHARGE CF <br /> GROUND WATER FROM CLEANUP OF <br /> PETROLEUM FUEL POLLUTION <br /> TO SURFACE WATERS <br /> This Order serves as a general NPDES Permit for the discharge to surface water <br /> of ground water from the investigation and cleanup of around water pollutea with <br /> petroleum fuels , such as gasoline, diesel , and heavier fuel oils. -he wastewater <br /> will be discharged to surface water and surface water drainage courses. rhe <br /> treatment and discharge of ground waters polluted with other chemicals , such as <br /> industrial solvents or pesticides, are not covered by this Order. Also not <br /> covered by this Order are: 1 ) Treated waste waters discharged to municipal <br /> wastewater collections systems (which do not need waste discharge requirements <br /> from the Board) , and 2) discharges to ponds, infiltration basins , spray disposal <br /> areas , subsurface infiltration, or other methods not involving discharge to <br /> surface waters and surface water drainage courses (which are covered by general <br /> waste discharge requirements for land disposal adopted by the Board) . <br /> The presence of fuel constituents in the ground water poses a threat to existing <br /> and potential beneficial uses of the ground water. The number of proposed ana <br /> ongoing ground water cleanups of fuel constituents is increasing. The primary <br /> constituents of concern with fuels are: Total Petroleum Hydrocarbons in the <br /> gasoline, diesel and heavier ranges; Benzene; Toluene; Xylene; Ethylbenzene; and <br /> Tetraethyl lead. Existing wastewater treatment technology, primarily utilizing <br /> air stripping and/or activated carbon, is capable of dependably removing these <br /> constituents to concentrations which are generally non-detectable by current <br /> analytical technology. Wastewater from a ground water cleanup may include: <br /> treated ground water which had been polluted with fuel constituents; unpolluted <br /> ground water pumped from beneath a layer of free product in order to establish <br /> a cone of depression to aid in the containment and extraction of the free <br /> product; extracted water from short- and long-term pump tests; well development <br /> water; purge water prior to well sampling. These wastewaters may be produced and <br /> treated on a continuous or batch basis. Treated wastewater will be disposed of <br /> to surface water and surface water drainage courses. <br /> The monitoring program enclosed within this general permit has been set up for <br /> a typical groundwater extraction/treatment facility. The monitoring program can <br /> be chanced to address site-specific concerns (sensitivity of receiving waters, <br /> reliability of treatment unit, etc. ) by issuing_ d separate Monitoring and <br /> Reporting Program which either increases or decreases the monitoring frequency. <br /> If the monitoring frequency is decreased the monitoring program may need to be <br /> re-noticed and sent out for comments. <br /> Effluent limits have been established as follows: <br /> a. 30-Day Median Concentrations for TPH, Benzene, Ethylbenzene, Toluene, and <br /> Xylene are established as ' non-detectable' , that is , less than the <br /> detection concentrations for specified, commonly available analytical <br /> technology. A 'median' is used rather than an ' average' or ' arithmetic <br /> mean' to allow for the detection of a constituent in individual samples <br /> without automatically causing violation of the monthly limitation, as <br />