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IHFORNATIOH SHEET <br /> • GENERAL ORDER FOR LARD 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 discharged 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 collections systems (which do not need waste discharge requirements <br /> from the Board) , and Z) waste discharges to surface waters and surface water <br /> drainage courses (which require an NPOES Permit adoptee 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; Ethyibenzene; and <br /> Tetraethyl lead. Existing wastewater treatment,technolo primarily utilizing <br /> air stripping and/or activated carbon, is capable of dependably 9Y� <br /> constituents to concentrations which are generally no -detectable <br /> eebby ncut�nt <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 have been established as follows: <br /> a. 30-Day Median Concentrations for TPH, Benzene, Ethyibenzene, Toluene, and <br /> Xyiene are established as ' non-detectable' , that is , less than the <br /> detection concentrations for specified, commoniv available analytical <br /> technology. A 'median' is used. rather than an ' 'verage, 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/i , 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 limits. 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 />