CORRESPONDENCE_1959 - 1989 - Laserfiche WebLink

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THE NEED FOR SITE-SPECIFIC these wastes are required to be discharged to waste DESIGNATED WASTE CLASSIFICATION management units which isolate them from the envi- ronment. DOMESTIC WATER Water Qgalfty Goals WELL UNLINED SURFACE IMPOUNDMENT Numerical water quality goals,designed to protect the various beneficial uses of ground and surface waters, V are selected from a variety of sources. Under a policy > ,• established by State Water Resources Control Board Resolution No.68-16 "Statement of Poli With cy >.>;:,�:..;;<;.,,< :. . ;.; Respect to Maintaining High Quality of Waters in ?:i\i.\tiff:;ti:i:;ti•} :. ;>;::::::<:.::::>::>:::: California",the existing high h q tY uali of waters must be maintained unless ess i t can besh shown h o that c some ad a- d Suffi i n �' et tion in quality ahtY s in i the best interest o e citizens o est f the f Attenuation ..-.....,.-..:: 7 California. Therefore,background concentrations of constituents in ground or surface waters that have been unaffected by waste management practices should be used as water quality goals whenever possible. If it has been determined that some degradation in water wit®� quality is to be permitted,Resolution No.68-16 . . . . . . . . . . . . . . . m specifies that in no case shall the degradation cause l . . . . . . . . . . . : : . . : beneficial uses of ground or surface waters to be 0.05 ng Arsenic /liter a tater GROUND impaired. Water quality standards and criteria exist in (Drinicing water swodsrd) a FL®w State and Federal regulations and in the literature • • • . • • • • • • • • • • • • • • • which provide numerical limits for constituents in Figure 3 waters used for specific purposes. State drinking water ured concentrations of constituents in a waste exceed CALCULATING DESIGNATED LEVELS these Designated Levels,the waste is assumed to pose Obtain information obtain information on the a water quality threat at the site in question. Because of an itis site of dischairge. waste to be dao the site-specific nature of the determination,the same waste may be classified as'designated'in one location, but not in another location which provides a greater what bcdin of water What factors may influence degree of protection for water quality. may be affected a the attenuation of Wangle constituent a W are the benefk�uses Designated Levels are calculated by first determining of the of a the bodies of water which may be affected by the waste management activity in question and the present and what numerical tater quality limits probable future beneficial uses of these waters,as will proms those beneficial' Estimate the magnitude of me from the waste c tituents a attenuation of wife cautiwents shown in Figure 4. Next,site-specific"water quality 41 at the site of d goals"are selected,based on background water quality Choose as most limiting or accepted criteria and standards,to protect those ofthosawaterquanoirnits. beneficial uses. Finally,the most limiting of these water quality goals are multiplied by factors which01 Water Quality Goal Attenuation Fact account for the magnitude of environmental attenu- ation expected to occur at the proposed site of dis- charge. The result is a set of Soluble Designated Levels SOLUBLE DESIGNATED LEVEL for waste constituents of concern which are specifically applicable to both the waste and site and which,if not what a tW rats of total to leachable Leachability Factor exceeded,should protect the beneficial uses of waters t concentradens a of the State. For the site in question,wastes having constituent concentrations in excess of these Desig- TOTAL DESIGNATED LEVEL hated Levels are assumed to pose a threat to water quality,are classified as'designated wastes'. As such, Figure 4 Page 3 Designated Level Methodology Summary