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2-6 Forward Composting Facility SWT Engineering Report of Composting Site Information - January 2022 Storage Areas. To the extent feasible, t he incoming compostable materials are mixed into compost piles the same day as received. The storage time of compost feedstock is 72 hours. Parking Areas . Visitor and employee parking are on the east side of the RRF building as shown on Figure 5. Processing Areas. The Compost Facility include s 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 24 hours from the time of receipt . 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. On-site soils are silt and clay, and will pro vide 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 vec tor attract ion 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. Windrow t urning and ASP aeration cycles 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. 2.1.4 Grading and Drainage Plan The RRF/Compost Facility was upgraded in 2014 to meet the requirements of WDR Order No. R5-2014-0006 and WDR Order No. 2020 -0012-DWQ . Figure 6 shows the 2014 stormwater grading plan for 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 C ompost Facility site. The composting windrows and heaps are arranged normal to the site slope to allow free drainage and minimize any ponding. The site is sloped to drain surface water to perimeter ditches designed to conve y storm water from a 25-year, 10-minute duration storm event (0.368 inches) assuming all the water that falls o n the C ompost Facility site runs off. The ditches carry the runoff water to lined