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Class DI Landfill Waste Acceptance -3- 3 November 1988 7) If the soluble or extractable constituent concentrations are all below the water quality objectives and criteria determined in section (4) above, the waste is not a 'designated waste'. If soluble or extractable concentrations of waste constituents exceed the water quality objectives and criteria, further justification would be required to demonstrate that the constituents will be attenuated such that they could not cause water quality objectives and criteria to be equaled or exceeded in surface or ground waters should migration from the landfill occur. Two references which may be useful in this regard are the Regional Board staff report"The Designated Level Methodology for Waste Classification and Cleanup Level Determination"(summary attached) and the Department of Health Services' "California Site Mitigation Decision Tree". Acopy ofthe Designated Level Methodology report is available for your review and photocopying(100 per page) in this office. The Decision Tree report may be obtained from the Department of General Services,Publications Section, P. O. Box 1015, North Highlands, CA 95660 for$12.50. If a detailed assessment of attenuation is not performed,Regional Board staff will generally assume the following generic attenuation factors, based on site conditions at the landfill. An attenuation factor of 100 will be assumed for clay-lined landfill units or sites where at least 30 feet of alluvial materials containing a significant clay content exist between the base of the landfill and the highest level of ground water, with the exception that a factor of 1000 will be assumed for copper and zinc at these sites. A 10-fold lower attenuation factor will be assumed for all other sites. The waste is not a 'designated waste' where the concentration of each soluble and extractable waste constituent(expressed in mg/1 of extract from the WET) is less than [the water quality objective or criterion (in nig/1)]x[attenuation factor]+[10] . The final factor of 10 accounts for the 10-fold dilution present in the WET method. Complete justification for all wastes proposed for discharge to the Class III landfill(s)at your facility which are not specifically permitted by WDRs or specified on the attached list of acceptable `nonhazardous solid' and 'inert' wastes must be submitted to this office for approval 30 days prior to discharge. If you wish to routinely accept a waste not specifically authorized by your WDRs or not listed on the attachment of'nonhazardous solid' and 'inert' wastes, you may need to apply to the Regional Board for a revision of your WDRs. If you have any questions regarding the procedures outlined in this letter,please call either Dr.Jon Marshack (916/361-5724)or Steve Rosenbaum(361-5732)of my staff or your area representative at the Regional Board. r---N t, Thomas R. Pinkos Supervising WRC Engineer Ground Water Protection and Investigations Section Attachments (3)