CORRESPONDENCE_1977-1996 - Laserfiche WebLink

Home Browse Search

ENVIRONMENTAL TECHNOLOOIES procedures for obtaining and verifying actual values of site-specific leaching and attenuation factors. Attenuation Factor Site-specific attenuation factors will be affected by critical parameters such as soil minerological composition (organic matter, oxides, and clay type), chemical retention capacity, chemical fixation capacity, soil lithology, thickness, number of hypothetical sorption plates of underlying soil, and depth to ground-water at the landfill. These parameters and others subsequently determined to be important will be evaluated and used to develop predictive empirical models for attenuation factors of selected chemicals. These site-specific attenuation factors for the selected chemicals will then be used to calculate site-specific designated waste levels. Following the identification of the relevant critical parameters to be used in predicting applicable attenuation factors, experimental methods and procedures will be developed for verifying attenuation factors predicted by the empirical models. Leachability Factors As with the attenuation factors, empirical models will also be derived for leachability factors based on field-simulated leachate. Site-specific conditions simulated y reproducing a actual chemical compositionthe precipitation in the 1 (instead a generic leachates, recommended in the TCLP analytical methods will be developed used as appropriate site-specific leachate. Some parameters to be considered in the determination of appropriate leachate and in the simulation of the leaching conditions at the landfill are: water, soil ratios, annual precipitation, frequency of precipitation, 100-year precipitation cycles, chemical composition of the precipitation in the region, and waste characteristics such as permeability and physicochemical characteristics. Experimental methodologies and procedures for measuring applicable parameters will also be developed. Task III: Meetings with the RWQCB and PHS Moju E.T. will meet with Forward, Inc., the RWQCB and PHS to discuss: (1) the chemicals selected for the determination of site-specific designated levels; (2) the critical parameters identified in Task II to determine site-specific attenuation and leachability factors; (3) the applicability of the predictive empirical models for estimating numerical values of the factors; and (4) experimental studies for verifying the numerical factors. Enforcement procedures for the designated levels will be developed by Moju E.T. in collaboration with the PHS. It is expected that two meetings will be conducted with the regulatory agencies. August 15, 1990 4 Revision 2.0 7255 Saroni Drive-Oakland,Californio,USA 94611 TEL(415)339-1543-FAX(415)339-6775