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5 Project Description-- Report of Composting Site Information Tracy Material Recovery facility and Transfer Station 30703 S. MacAritwr Drive, Tracy, Califomia 95377 Technology Application Section 4 Covered Aerated Static Pile Covered ASP systems are designed as a cost-effective system for controlling potential environmental impacts (including storm water contamination and odors) and maintaining # optimal pile conditions during composting. It combines a waterproof, synthetic fabric cover with a computerized aeration control technology to optimize composting conditions for all types of feedstocks. The cover is designed with straps for handling and securing it and may be placed and removed manually or with mechanized cover-rollers. The cover may be held in place by ;. the aeration system which operates with negative suction that holds it firm against the pile or (for positive aeration) use of perimeter weight at the base of each ASP. The impermeable cover over the ASP eliminates rain percolating through the pile and therefore reduces the total nutrient found in the facility run-off. Proper grading of the site is maintained to provide limited intrusion of storm water around the "sealed" edge of the cover. The covered ASP system uses computer-based control technology. Compost pile temperature data is collected and stored on the computer and the individual batches of compost are easily tracked through the facility from start to finish. The piles are aerated and flow is automatically controlled per operator chosen set-points. The negatively- aerated system exhaust air is scrubbed in a biofilter constructed of wood chips. The aeration rates can be set very low to conserve moisture and fan power, without releasing odors. Prior to removing the cover the aeration is increased to lower temperatures and raise oxygen levels; this greatly diminishes the potential for odor releases. �I b. A descriptive statement of the operations conducted at the facility. i • Incoming trucks will be received and weighed at the scale located near the entrance to the facility. The scale personnel will direct haulers to the composting p g facility after a l cursory load check. Appropriate signage in conformance with the requirements of 14 CCR §17867(x) (7) will be placed within the composting facility. • The source separated green materials delivered to the compost facilitywill be directed to the receiving area. The compost facility personnel will conduct a load check upon deposition. Contaminated and uncompostable materials will either be returned to the hauler or placed in a bin located near the receiving area. Feedstocks The feedstock material for the covered aerated static pile system consists of pre and post-consumer food wastes from residential, commercial and industrial sectors mixed with a bulking additive to provide porosity in bags that are formed into piles. Non-compostable materials removed from accepted loads of feedstock material will i 46 Edgar 8 Associates,Inc. Tracy Compost Fac ProjOesc042310 ' E.