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INFORMATION SHEET <br /> GENERAL ORDER FOR LAND DISPOSAL <br /> OF GROUND WATER FROM CLEANUP OF <br /> PETROLEUM FUEL POLLUTION <br /> This Order serves as general waste discharge requirements for the land disposal <br /> of ground water from the investigation and cleanup of ground water polluted with <br /> petroleum fuels , such as gasoline, diesel , and heavier fuel oils. The wastewater <br /> may be d i schargea to ponds, infiltration basins, spray disposal areas, subsurface <br /> infiltration, or other methods not involving discharge to surface waters. The <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 wastewaters discharged to municipal <br /> wastewater coilections systems (which do not need waste discharge requirements <br /> from the Board ) , and 2) waste discharges to surface waters and surface water <br /> drainage courses (which require an NPDES Permit 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 and <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 may be disposed of <br /> by subsurface injection, subsurface infiltration, surface infiltration, <br /> evaporation, land spreading, spray disposal , or by reclamation for irrigation of <br /> landscape or selected crops. <br /> Effluent limits nave been established as follows: <br /> a• 30-Day Median Concentrations for TPH, Benzene, Ethylbenzene, Toluene, and <br /> Xvlene are established as ' non-detectable' , that is , less than the <br /> detection concentrations for specified, commonly available analytical <br /> technoiooy. 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 /> would occur with an ' average' or 'mean ' limit. The 30-Day Median <br /> Concentration for Lead is established at 5 ug/l , one-tenth the MCL for <br /> Lead. <br /> Routine effluent sampling would be conducted monthly, which is inadequate <br /> to determine compliance with the 30-day median imits. The treatment <br /> technologies utilized for ground water cleanup of fuel constituents are <br /> not normally subject to sudden upset or bypass , so rapid changes in <br />