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_ rNMENT, L TECHNOLOGIES INTRODUCTION This Work Plan describes the method for determining site-specific "Designated Levels" for solid waste, including contaminated soils to be disposed in Class III Waste Management Units(WMUs) at the Forward Landfill facility in Stockton, California. This Work Plan has been prepared by Moju Environmental Technologies (Moju E.T.) on behalf of Forward, Inc., in accordance with the provisions in the Waste Discharge Requirements (WDR 89-148) for the landfill. Site-specific designated levels will be determined for the individual chemicals contained in solid waste that can be accepted by the Forward Landfill under the Contaminated Soil Acceptance Program, dated June 23, 1990. Procedures for determining these designated levels will be developed as part of the activities in this Work Plan. Site-specific designated levels for selected chemicals will be submitted to the Regional Water Quality Control Board (RWQCB), Central Valley Region (RWQCB) for approval. The Public Health Services (PHS) for San Joaquin County, working with the RWQCB, will be responsible for the enforcement of the designated levels at the landfill. Determination of designated levels will follow the "Designated Level Methodology for Waste Classification and Cleanup Level Determination", contained in the RWQCB document prepared by Dr. Jon Marshack, dated October 1986, updated June 1989. In accordance with this methodology, the total designated level for chemical constituents in a solid waste is the product of three factors: Water-Quality Goal, Environmental Attenuation Factor, and Leachability Factor. As a first step, this Work Plan will use the generic values for attenuation and leachability factors, as described by Marshack, to derive designated levels for all types of chemicals in contaminated soils accepted at the landfill. Subsequently, procedures for obtaining numerical values for site- specific attenuation factors and waste-specific leachability factors will be developed for selected chemicals. Background ground-water quality for the region of the landfill, primary drinking water standards, or maximum contaminant levels (MCLS) as required by Title 22 (Division 4, Chapter 15) of the California Code of Regulations will be considered for water-quality goals. Designated levels will be determined under this workplan for wastes containing the following types of chemical constituents: • petroleum compounds - waste oil/fatty acids and long-chain aliphatic hydrocarbons. • CAM metals - cadmium, chromium VI and total chromium, lead, mercury, nickel, zinc, copper, arsenic, selenium, manganese, molybdenum, silver, thallium • polynuclear aromatics (PNA) - napthalene, acenapthalene August 15, 1990 1 Revision 2.0 7255 Saroni Drive•Oakland,California,USA 94611 TEL(415)339-1543-FAX(415)339-6775