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2-4 <br />Forward Composting Facility SWT Engineering <br /> Report of Composting Site Information - July 2014 <br />z:\projects\allied waste\forward\resource recovery facility\5 yr permit rvw 2013-14\rcsi 2014\text\sec 2.doc <br />production well is located along the eastern boundary of the site, just south of the entrance <br />to the Composting Facility/RRF. The locations of the wells located in the RRF/Compost <br />Facility area are shown on Figure 2. In addition, water is available from the storm water <br />runoff sedimentation basins, however this alternative is not currently utilized at the site. For <br />additional information, refer to Section 3.5.2. <br />These water supplies are available for initial mixing of the compost to bring the water <br />content up to desired levels, wetting of the compost, dust control, and other applications <br />through use of on-site water trucks. <br />Preprocessing. Preprocessing and initial handling of feedstocks is also common to the <br />alternatives. Materials with large particle sizes such as wood waste, green material and <br />agricultural wastes may require grinding before use as feedstock and composting. All <br />incoming feedstock is spread out for manual screening before being stockpiled. These <br />materials will be handled in the manual sorting receiving area of the Compost Facility and <br />ground using a tub grinder. Additional grinding capacity will be added, as necessary, to <br />handle the volume of green and wood waste material received at the facility. Green <br />material high in grass will be mixed as soon as possible with ground wood waste and/or <br />recycled compost and/or other relatively dry and low C:N feedstock to minimize odor <br />production. Sorting of green and wood waste materials is done only as part of the <br />composting operation in an area near the grinder. <br />Any MSW that is mixed in with the curbside greenwaste is removed before composting. In <br />addition, removal of large objects is necessary to prevent damage to Windrow turning <br />equipment and grinding will aid decomposition during composting. If a higher quality <br />product is desired, more extensive pre-processing may be necessary. This could consist of <br />manual picking of metal, plastics and glass from the incoming material or receipt of clean <br />source-separated waste. <br />Grinding and trommel screening of the material prior to composting has significantly <br />improved the quality of the final compost product. More mechanized processing has <br />included magnetic and eddy current separation for improved removal of iron and aluminum <br />components of the waste stream. The decision on the amount of preprocessing will be <br />determined by economics and the final use of the compost product. <br />Semi-solid materials such as food processing residue and food waste will be placed on other <br />materials such as ground green material or wood waste or recycled compost and mixed as <br />soon as possible to minimize the potential for leachate formation and odors. The amount of <br />these materials accepted will be limited by the availability of other feedstocks. <br />Current Design/Processing Option <br />Windrow Composting using a Windrow Turner. Figure 4 shows the layout for windrow <br />composting using a Windrow turner. A loader will be used to create the windrows, and a <br />windrow turner is used to turn the windrows. The windrow dimensions can be up to <br />approximately 7 feet high and approximately 15 feet wide at the base. The space between <br />Windrows is about 8 feet to provide access for a water truck for water addition and for fire <br />control. Windrow composting using a windrow turner is also discussed included in Section <br />1.3.1.