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The inverse of the LF or the percent soluble naphthalene is also very low for the soil sample <br /> . from DMW-5, 26 feet bgs, percent soluble naphthalene is 2 78%, and at least 1 54% for SB-20, 21 <br /> feet bgs These results suggest that 97 22% to 98 46% of the naphthalene present is insoluble in <br /> water Combining the low total concentrations of naphthalene (<5 mg/kg) with its low water <br /> solubility, the potential for this constituent to impact groundwater is low <br /> 4 3 DESIGNATED LEVEL METHODOLOGY <br /> The RWQCB developed the Designated Level Methodology (DLM) (attached in Appendix <br /> E) to estimate the potential impact of any solid, sludge, or liquid waste impoundment to impact <br /> groundwater In employing the DLM evaluation, site-specific parameters are identified including <br /> water quality goals of the region, leachable fractions of a solid waste (discussed above in Section <br /> 4 2), and environmental attenuation factors (surface infiltration rate, soil type, depth to groundwater) <br /> By combining these factors, a predicted target concentration or designated level of a particular waste <br /> can be calculated for any site <br /> Designated levels are measures of the minimum concentrations of waste constituents which, <br /> upon accounting for the environmental attenuation factor of the site and the LF of the constituent, <br /> have the potential to cause the water quality goals for the constituents of concern to be equalled or <br /> exceeded in the groundwater The soluble designated level for a constituent of a solid waste, <br /> expressed in milligrams of constituent per liter of a WET extract (mg/l of extract) is as follows <br /> Soluble Water Quality Environmental <br /> Designated = Goal (mg1L) x Attenuation - 10 <br /> Level(mg/l) Factor <br /> Following the calculation of the soluble designated level, analytical results of the WET <br /> extracts from the Site are compared to the calculated soluble designated level If the WET extract <br /> exceeds the calculated soluble designated level, the solid waste is considered a "designated" waste, <br /> which implies that this material may impact groundwater Conversely, if the analysis of WET <br /> extracts do not exceed soluble designated level, the waste is not considered a "designated" material <br /> which may impact groundwater <br /> SAC156 14 9 <br />