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APPENDIX A. Management and Disposal Plan for Contaminated Soils in the Nortberu Portion of Subarea 3. 1.0 Management of Contaminated Soils. Initially, the area of gravel mining is expected to be limited to the area south of the east-west road that traverses Subarea 3 (see Figure 2). Although certain contaminated soils have been discovered to the south of this road, in the northern portion of Subarea 3, it is unlikely that this area will be mined for several years. However, in the event that it becomes necessary to remove contaminated overburden in this area to enable mining of the underlying gravel, the contaminated material will be moved and stockpiled north of the road. Any stockpile will have the following features: 1.1 Water Control & Management. A system of berms suttounding the stockpile will be constructed to contain run-on/tun-off from a 25-year, 24 hour storm event of approximately 2. ] inches of precipitation. Berms will be at least two feet above grade and constructed of clean soil material • from the Refinery site. 1.2 Dust and Odor wntrol. Dust control will be achieved mostly by the oil mixture in the soils. If necessary, this will be augmented by spraying the stockpile with water, or covering the stockpile with impervious plastic sheeting. This will also be the primary method of odor containment. 2.0 Disposal of Stockpiled Contaminated Soils. Within a maximum of four years of the commencement of stockpiling, provided the soils exhibit suitable chemical characteristics, the material will be treated in one of the following ways: 2.1 Used in conjunction with a hot mix plant or similar operation; or 2.2 treated in the solid waste Corrective Action Management Unit (CAMU) to be constructed west ofthe area of contaminated soils in Waste Pile #4; or 2.3 land farmed in another part of the facility, the location of which will be agreed jointly by FMM and the Division; or 2.4 treated off-site in a local landfill or other suitable facility.