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