ARCHIVED REPORTS_JULY 2014 FINAL RCSI

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2-6 Forward Composting Facility SWT Engineering Report of Composting Site Information - July 2014 z:\projects\allied waste\forward\resource recovery facility\5 yr permit rvw 2013-14\rcsi 2014\text\sec 2.doc Processing Areas. The Compost Facility includes areas for receiving, precompost processing, post-processing, and compost storage. Non-processible materials (residual wastes) will be hauled to the Forward Landfill for disposal at the end of each working day or within 48 hours. Figure 2 includes a general dimension of the unloading, storage, processing, parking, and loading areas. Design calculations for this area is included in Appendix B. Prevention of the Propagation of Vectors and the Creation of Nuisances. The site will be graded as shown on the grading plan (Figure 6) to promote drainage of surface water from all areas of the site into two ditches that drain to a sedimentation basin. The site will be constructed of compacted native earth. Onsite soils are silt and clay, and will provide a relatively impermeable surface. The site will be graded relatively smooth allowing complete removal of deposited feedstock. Feedstock such as food processing residue will be incorporated immediately into compost piles to minimize the chance of vector attraction and reproduction as well as for odor minimization. Semi-solid and liquid feedstocks will be added to other feedstocks at a rate to meet the composting mixture moisture criteria, thus minimizing the potential for leachate formation. Semi-solid and liquid feedstocks will be incorporated immediately into compost piles to minimize the chance of vector attraction and reproduction as well as the generation of potential odors. Other highly putresible wastes such as grass will also be incorporated immediately into compost to minimize the chance of vector attraction and reproduction and odor production. All feedstocks will be mixed in proportions that promote efficient composting, aerobic conditions, and minimize ammonia odor release. Turning will be scheduled to provide compliance with pathogen reduction requirements and maintain aerobic conditions. Water Usage. Water will be added to the piles, as necessary, before turning to maintain efficient composting. Water will also be used to control dust from the compost pad and various composting operations, such as grinding and screening as determined from experience. 2.1.4 Grading and Drainage Plan The grading and drainage plan (Figure 6) shows the proposed grading of the RRF/Compost Facility. The grading plan is the same for all of the potential composting options. A one percent minimum grade is provided at all points in the Compost Facility site. The composting windrows are arranged normal to the site slope to allow free drainage and minimize any ponding. The composting pad will be constructed of compacted native soils. These soils are silt and clay and when compacted will provide a composting pad of relatively low-permeability soils. During periods of wet weather, the Compost Facility may suspend composting operations to prevent damage to the composting pad. Alternatively, economics may allow construction of a gravel surfaced or asphalt paved composting pad to allow continuous operations. During periods of extreme wet weather, the Compost Facility may choose to not accept wastes. The site is sloped to drain surface water to perimeter ditches designed to convey storm water from a 25-year, 10-minute duration storm event (0.25 inches, 1.5 inches per hour) assuming all the water that falls on the Compost Facility site runs off. The ditches will carry the water to a sedimentation (retention) basin designed to hold the net average annual rainfall during months where rainfall exceeds evaporation (5.67 inches) assuming all the