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SECTION 5 <br />EN1213161143SAC DRAFT – 12/23/16 5-1 <br />Composting Area <br />Similar to the existing operation, the new composting area will be an outdoor operation designed to <br />accept and process yard waste, agricultural by-products, and wood waste into compost. Future addition <br />of other feedstocks may be considered at a later date; however, the County has indicated that it is not <br />interested in accepting post-consumer food waste or biosolids at this site. <br />The composting technology used at the new site will be different from that at the existing windrow <br />operation. The new site will use a combination of aerated static pile (ASP) and windrow curing, and will <br />be designed to be operated in a batch process. <br />5.1 Composting Area Components <br />The following key components of the proposed development are shown on the attached process flow <br />diagram (Figure 5) and compost area concept layout (Figure 6): <br />• An uncovered feedstock receiving, grinding, and mixing area (223 feet by 242 feet) situated just off <br />the compost traffic lane, toward the top of the site. This area will be designed for back-in access to <br />customers for dropping off materials for composting. Feedstocks will be unloaded onto the asphalt <br />pad in this area and then subsequently moved or handled with a small front-end loader. The existing <br />electric grinder will be used to grind feedstock and amendment as needed. <br />• Eight outdoor (55 feet by 25 feet) ASP composting systems with back, side, and interior walls <br />constructed of ecology blocks. These systems will have an associated biofilter odor treatment <br />system. This area will be designed for a material residence time of 4 weeks. The ASP composting <br />system will consist of eight discrete aeration zones that are constructed in two identical groups of <br />four. The two groups of aeration zones will run independently of each other, and each will consist of <br />the following components: <br />− On-grade high-density polyethylene aeration laterals situated below each composting pile (two <br />per aeration zone) <br />− An above-grade header pipe that distributes air to and from the aeration laterals (one per aeration <br />zone) <br />− A common process air duct that provides the connection between the individual aeration zone <br />headers and the fan equipment <br />− Centrifugal fans (one per group of four aeration zones) and associated dampers that allow <br />airflow to each zone to be controlled <br />− An organic media biofilter that will treat process air collected from the composting piles <br />• An outdoor pad for windrow curing of feedstocks. The size of the windrow pad will be based on <br />managing materials in up to 18 windrows that are up to 18 feet wide and 7 feet high using a large <br />straddle-type windrow turner with an 8-week residence time. The typical length of each windrow <br />will be 115 feet. <br />• A screening area between the curing windrows. The aisle between the two rows of curing windrows <br />will be wide enough to accommodate the existing trommel screen. <br />• An amendment storage and finished product screening and storage pad designed for up to eight <br />rectangular finished product piles that are 55 by 75 feet and will accommodate a height of 12 to <br />13 feet. Piles will be made with a front-end loader.