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04 January 2013 AGE -NC Project No. 12-2179 Page 4 of 7 2.0 DESIGNING OF DAILY CLOSURE COVER The first design step was to determine what impacts the clean closure project would have on the environment as required by the California Environmental Quality Act. Land use adjacent to the landfill consists of the Santa Fe Road base to the west (elevated and tree lined), Henry Road to the east, an orchard to the north with a bluff separating the site and the trees, private property to the south and further south beyond the private property, a small market, which is a known hazardous waste site (gasoline station). No significant impact to the surrounding area is anticipated. The second design step was to fully characterize the landfill contents and extent, especially the area where illicit dumping occurred. An investigation has been conducted to demonstrate an area to the northwestern portion of the site has exposed disposed waste (metal waste is exposed). Whenever possible, private equipment and operators are to be used (no employees) to minimize investigation costs. The "pre -design" investigation provided accurate volumes of soil to be used and waste to be included in the proposed construction of the clean cover and the estimate of probable construction costs. For the Waller-McAnaly Property landfill (approximately 13,000 cubic yards of waste) resulted in fill that was composed of about 50% soil and 50% waste and where minimal daily soil cover is applied over waste. A new soil cover of approximately one -foot in thickness is proposed for the site stabilization. The CAP must be performed in such a manner to keep costs of the closure to a minimum and to prevent hauling of in the entire 2,200-2,500 cubic yards of cap material. Thus, stockpiles should be staged on the undisturbed portions of the landfill, due to space restrictions in the remainder of the site. Since most of the waste was inert material such as tree stumps, tires, asphalt, concrete, and lumber, on-site segregation had the potential to produce large volumes of refuse -free soil that could be left on-site. Clean closure regulations require that soil segregated from waste be chemically tested and cleared prior to backfilling, as if it was imported from an off- site source. e 1 The design document package, which consists of an aerial drawing, cover specifications (local soil), planing for source soil cover and permit for grading has currently been completed. Advanced GeoEnvironmental, Inc.