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A similar designated level calculation can be completed for solid wastes without WET results The total designated level employs the LF described above in Section 4 2 From page 37 of the DLM (Appendix E), the formula for the total designated level is Total Water Quality Environmental Leachability Designated = ( g'l) x Attenuation x Factor Level(mg1kg) Goal m Factor (Ilkg) g r 5 Following the calculation of the total designated level analytical results for total constituents from the Site, the results are compared to the calculated total designated level If analytical results exceed the calculated designated level, the solid is considered "designated" waste, which may impact groundwater The DLM is not a rigorous fate-and-transport model, however, the DLM is typically conservative and identifies key site conditions and waste characteristics such as the mobility of the waste constituent chemicals The DLM evaluation is accepted by the RWQCB and PHS-EHD as an �{ appropriate method to evaluate potential impacts to groundwater, and for this reason, this approach was used at this Site Tables 3 and 4 summarize the DLM evaluation for the Site The parameters used in this analysis are discussed below { 4 3 1 Water Quality Goals The DLM specifies that the Water Quality Goal used in the DLM evaluation should be developed from a review of background quality of groundwater, human health, human welfare, aquatic life and wildlife, agricultural and other uses which are listed in "A compilation of Water Quality Goals" (RWQCB, 1993) After review of these criteria, "Suggested No Adverse Response 1 Levels (SNARLs)" for non-carcinogenic materials including diesel oil in water were established at concentrations of 0 1 ing/l No other state or federal MCL, taste, odor, or other action level was identified for any of the constituents listed in Table 4 or 5 Since no action level could be identified, the analytical detection limit for semivolatile compounds(0 004 mg/1) including naphthalene was used in this analysis as the water quality goal for Tables 4 and 5 I 4 3 2 Soil Attenuation Factor The DLM (p 32) recommends a soil attenuation factor of 100 for a "generic" unlined landfill site where no detailed fate-and-transport analysis is available However, "studies stress that the degree of attenuation of waste constituents depends on waste and site conditions It is therefore impossible to select an attenuation factor appropriate for [all] situations" (DLM, Appendix E, p 32) SAC156 14 10 DAMES &MOORE