ARCHIVED REPORTS_2022 [REV] RCSI W/CHANGES

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3-8 Forward Composting Facility SWT Engineering Report of Composting Site Information - August 2019January 2022 z:\projects\allied waste\forward\resource recovery facility\5 yr permit rvw 2019-2020\rcsi 2019\text\sec 3.doc After personnel have removed unacceptable and/or difficult materials and large wood objects from the waste w hich requires grinding, a front end loader will feed the waste into the grinder or move the material within reach of a grapple that will load the grinder. The grinder will shred the material into pieces with a nominal size of approximately 3 to 6 inches. After the material passes through the grinder, it is dropped onto a conveyor that moves the material past a magnetic separator. A magnetic separator is provided to extract nails and other ferrous contaminants from the material. The shredded waste is moved by the front end loader to the composting area or loaded into a dump truck that will transport the material to the composting area where it is combined with other feedstock s. The waste materials are formed into windrow compost piles, which are up to approximately 15 feet wide by 7 feet tall at center, and of varying lengths up to 300 feet , or ASP compost piles, which are approximately 30 feet wide by 10 feet tall at the center, and up to 110 feet in length. The active windrow compost will be mixed, as required, for proper control depending on temperature and moisture profiles and season (turning will be kept to a minimum during the rainy season). The frequency of the Windrow turning and water addition will be determined by monitoring the pile temperature and moisture content. The ASP compost piles will be monitored regularly and aeration cycles will be adjusted accordingly to maintain appropriate temperature. Temperatures within the active compost are monitored daily using hand-held temperature probes. This information is recorded and records are maintained at the facility. Moisture content is monitored based on incoming moisture content, moisture addition, and by manual and laboratory testing. Piles are watered, and/or turned, and/or aerated based on the results of monitoring. All operating standards defined by S tate composting regulations are followed. As the materials (including water) in the active compost age, the volume of the compost decreases. Windrows will be combined with neighboring Windrows to maintain the desired pile dimensions. The f inal mat erial is screened according to market specifications. Screened material is stockpiled on the site prior to loadout to markets or for on -site uses. Oversized materials (overs) from the screening process areis reground, sold, or landfilled. b. Quench or Process Water Although this alternative is not currently used , tThe water collected in the runoff sedimentation basin may be used as process water to meet the desired moisture contents for composting. Water from the sedimentation basin may be applied to the wastefeedstock , on an as needed basis and as available, as it leaves the tub grinder. A fixed nozzle will spray the water on the processed (ground) feedstock material (e.g., green and wood waste) at the discharge of the conveyor from the tub grinder. This process will eliminate the potential for pathogen regrowth in the active compost. The nozzle will not require contact with a human operator. If runoff water from the sedimentation pond is utilized, a pump system will be required to move water from the sedimentation basin to the tub grinder area. The rate of application of water will be determined to provide the desired final mixture moisture content. The primary source of process water at the RRF/Compost Facility is obtained from other on - site sources. Water for facility operations is supplied by four production wells. One well, located near the main entrance facility was drilled to a depth of approximately 135 feet and groundwater occurs at a depth of approximately 70 feet. The well wa s likely installed before the opening of the landfill, having been previously used for agricultural purposes. It is