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0k6TE:CH;1V0L0G1E5 <br /> NMENTAL <br /> Task I: Estimation of Designated Levels Based on Generic Attenuation and <br /> Leachability <br /> Deliverable: Designated level tables for CAM metals, organic solvents, ketones alcohols, <br /> phenols, phthalates, herbicides, polynuclear aromatics (PNA), and petroleum compounds. <br /> Generic numbers used in the Marshack document [attenuation = 100 or 1000 and leachability <br /> = 10 or 100], will be used to estimate designated levels for the targeted chemicals contained in <br /> solid waste that are accepted at the Forward landfill. Water-quality goals will be determined for <br /> ground-water background levels based on upgradient or regional monitoring well data. <br /> Background water-quality data will be statistically evaluated to determine the representative <br /> regional ground-water quality. <br /> The reference documents used by Dr. Marshack to derive his generic numbers for attenuation <br /> and leachability factors will be briefly reviewed to determine the applicability of these generic <br /> numbers to the Forward Landfill. These reference documents include: <br /> • The California Site Mitigation Decision Tree Manual <br /> ® Water Related Environmental Fate of the 129 Priority Pollutants <br /> ® The Soil Chemistry of Hazardous Materials <br /> ® Handbook of Environmental Data on Organic Chemicals <br /> • DRASTIC: A Standardized System for Evaluating Ground Water Pollution <br /> Potential Using Hydrogeologic Settings. <br /> Critical parameters contributing to the numerical value of the factors will be identified. The <br /> appropriateness of the generic numbers used in the Marshack document for attenuation and <br /> leachability factors at this landfill and the types of waste accepted at the landfill will be evaluated <br /> for each specific chemical. Those chemicals in which the generic numbers for factors are not <br /> appropriate for the Forward Landfill facility will be selected for follow-up determination of site- <br /> specific factors. <br /> Task H: Development of Parameters and Experimental Methods for factors <br /> Deliverables: Composition of representative precipitation in the Stockton area; predictive <br /> empirical model for estimating applicable leaching and attenuation factors; and experimental <br /> August 15, 1990 3 Revision 2.0 <br /> 7255 Soroni Drive-Oakland,California,USA 94611 <br /> TEL(415)339-1543-FAX(415)339-6775 <br />