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Odor Impact Minimization Plan—Compost Facility <br /> Tracy Material Recovery Facility and Transfer Station <br /> 30703 S. MacArthur Drive, Tracy, California 95377 <br /> controlled. Odor emissions from the green material and co-collected food waste <br /> feedstock will be minimized through proper management of the windrows and <br /> storage piles in terms of time, temperature, moisture, turning to maintain aerobic <br /> conditions, and proper carbon-to-nitrogen (C:N) ratio to reduce ammonia levels. <br /> The consistent monitoring of the active compost will maximize the aerobic <br /> decomposition. Maintenance of the optimum moisture content and application of <br /> water will enhance and expedite aerobic decomposition and minimize odor <br /> emissions. <br /> Aerated Static Pile Composting System <br /> Operational practices are key contributors to effective odor control for the aerated <br /> static pile composting. Thorough inspections of incoming loads coupled with <br /> prompt blending of yard and organic wastes, plus rapid movement of feedstock <br /> to the aerated static pile sytem are all essential operating steps. Under normal <br /> operations, wastes will be processed into bags within 48 hours of receipt. The <br /> Covered ASP system relies on forced aeration to facilitate aerobic conditions and <br /> minimize odor generation. <br /> Covered ASP systems are designed as a cost-effective system for controlling <br /> potential environmental impacts (including storm water contamination and odors) <br /> and maintaining optimal pile conditions during composting. It combines either a <br /> waterproof, synthetic fabric cover, or a cover consisting of finished compost <br /> and/or compost overs, with a computerized aeration control technology to <br /> optimize composting conditions for all types of feedstocks. <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 <br /> batches of compost are easily tracked through the facility from start to finish. Air <br /> flow is automatically controlled per operator-chosen set-points. The system <br /> exhaust air is scrubbed in a biofilter constructed of wood chips in the case of <br /> negative aeration, and passes through the layer of finished compost and/or <br /> compost overs in the case of positive aeration. The aeration rates can be set <br /> very low to conserve moisture and fan power, without releasing odors. Prior to <br /> removing the cover the aeration is increased to lower temperatures and raise <br /> oxygen levels; this greatly diminishes the potential for odor releases. The use of <br /> an aeration floor facilitates implementation of aerated static piles. <br /> Processed feedstocks are constructed into piles over an aeration floor or an <br /> inflatable/collapsible form that creates an aeration vault. The covered ASP piles <br /> are covered with a synthetic cover that controls the dissipation of moisture and <br /> odors once the aeration systems are employed. Materials are rotated through <br /> three cycles, of approximately two weeks each, where the piles are turned to <br /> maximize exposure to aerobic activity and the high temperatures which kill <br /> pathogens. <br /> 14 <br />