Agenda - 02-10-1998 - Attachment 3h

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following a period of very heavy rain (i.e., approximately 9 inches in one month). Water was observed flowing along the length of the northern drainage feature to within approximately 600 feet of the eastern property line, and in the minor drainage features feeding both the northern and southern drainages. Therefore, shallow depths to groundwater were assumed in the low lying portions of the site to represent the high water condition. Site monitoring will be required for an unlined CDLF and/or a lined MSWLF. The monitoring network will require an upgradient or background well(s), and downgradient wells in the direction of groundwater flow. An upgradient well will be difficult to locate because the disposal area is located across the topographic high. Howeverx.possible locations exist for a facility background well which can be used in lieu of an upgradient well. A facility background well(s) can be located in the northeast or southeast corners on opposite sides of the drainage features, or on the knoll near the east - central portion of the property. Downgradient wells are easily located around the southern, western, and northern boundaries of the disposal area. Groundwater monitoring wells will not be required for a MRF or transfer facility. Wash water/leachate will. have to be collected from the concrete tipping floor and stored prior to treatment or disposal. Some analysis of the water may be required by the receiving facility. 5.0 CONSTRUCTION AND DEMOLITION LANDFILL The proposed construction and demolition debris landfill (CDLF) will provide for the disposal of solid waste resulting from construction, remodeling, repair or demolition operations on pavement, buildings, or other structures, and inert, land- clearing debris, excluding yard trash. For the purposes of this report, the C &D waste stream in Orange County has been assumed based on current figures and waste quantities projected in the current Solid Waste Management Plan. For the purpose of this report, the C &D waste stream.was assumed to. decrease from 28,000 tons per year at the start of operation on July 1, 1999 to 18,000 tons per year in the year 2006. The C &D waste stream in the years following 2006 was assumed to increase by 1.5 percent per year. The projected annual waste quantities are provided in Table 2. 5.1 Siting Requirements The siting requirements for a CDLF are provided in Solid Waste Management Rule .0503. The siting criteria are listed below, along with applicable information available for the Greene and Neville tracts. Flood 1p ains: A site located in a floodplain shall not restrict the flow of the 100 year flood, reduce the temporary water storage capacity of the floodplain, or result in a washout of solid waste so as to pose a hazard to human life, wildlife, or land or water resources. No regulated floodplains are present on the site. Study of Solid Waste Management Options JOYCE ENGINEERING, INC. for the Greene and Neville Tracts February 4, 1998 Orange County, North Carolina 4