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Report of Composting Site Information <br /> Tracy Material Recovery Facility and Transfer Station <br /> 30703 S. MacAurthur Drive, Tracy, Ca. 95377 <br /> Compressed Windrow Method <br /> Compressed windrows are managed in essentially the same way as the elongated <br /> windrow method with respect to monitoring, tracking, and pathogen reduction. <br /> However, there are a few differences related to the geometry of the pile. <br /> • The material is formed into trapezoidal-shaped windrows. Windrows are <br /> approximately 60 feet wide, 15 feet high, and have varying length. Windrows are <br /> separated by a minimum 12-foot wide access road for windrow loading, monitoring, <br /> watering, and turning. <br /> • Compressed windrow composting operates in a 'plug-flow' manner where the <br /> material is introduced to the windrow and then removed from the compost process <br /> with a retention time of 13 weeks for composting, and approximately 30 days for <br /> curing. Front-end loaders will re-stack the compost approximately 15 feet laterally <br /> from its original position. In this way composting material migrates from one end of <br /> the windrow to the other in a wave like motion; during this cycle, organic material is <br /> exposed to the inner-core with temperatures ranging between 54 to 60° Celsius, well <br /> within the range for pathogen reduction. Turning of this windrow will follow the 15- <br /> day, five turning method for elongated windrows. The timing of the turning of the <br /> material in the compressed windrow during this initial 15 days and beyond will be <br /> coordinated with the temperature measurements. <br /> Covered Aerated Static Pile (ASP) <br /> Covered ASP systems are designed as a cost-effective system for controlling potential <br /> environmental impacts (including storm water contamination and odors) and maintaining <br /> optimal pile conditions during composting. It combines either a waterproof, synthetic <br /> fabric cover, or a cover consisting of finished compost and/or compost overs, with a <br /> computerized aeration control technology to optimize composting conditions for all types <br /> of feedstocks. Additional information is provided in Appendix D regarding this covered <br /> ASP system. <br /> The covered ASP system uses computer-based control technology. Compost pile <br /> temperature data is collected and stored on the computer and the individual batches of <br /> compost are easily tracked through the facility from start to finish. Air flow is <br /> automatically controlled per operator-chosen set-points. The system exhaust air is <br /> scrubbed in a biofilter constructed of wood chips in the case of negative aeration, and <br /> passes through the layer of finished compost and/or compost overs in the case of <br /> positive aeration. The aeration rates can be set very low to conserve moisture and fan <br /> power, without releasing odors. Prior to removing the cover the aeration is increased to <br /> lower temperatures and raise oxygen levels; this greatly diminishes the potential for <br /> odor releases. The use of an aeration floor facilitates implementation of aerated static <br /> piles. <br /> Similarly with the elongated and compressed windrows, two types of geometries are <br /> available for the aerated static pile; elongated and extended. <br /> • Elongated Aerated Static Pile <br /> 13 <br />