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II Odor Impact Minimization Plan —Compost Facility Tracy Material Recovery Facility and Transfer Station 30703 S. Mac44ur Drive, Tracy, California 95377 storage piles in terms of time, temperature, moisture, turning to maintain aerobic conditions, and proper carbon-to-nitrogen (C:N) ratio to reduce ammonia levels. The consistent monitoring of the active compost will maximize the aerobic decomposition. Maintenance of the optimum moisture content and application of water will enhance and expedite aerobic decomposition and minimize odor emissions. CTI System I� Operational practices are also key contributors to effective odor control for the enclosed aerated static pile composting (CTI System). Thorough inspections of incoming loads coupled with prompt blending of yard and organic wastes, plus rapid movement of feedstock from the CTI feedstock processing/mixing area into the fully enclosed composting bags are all essential operating steps. Under normal operations, wastes will be 'processed into bags within 48 hours of receipt. • Bagging The feedstock is placed into a bagging machine that fills an elongated thermoplastic 8-mil laminated plastic composting bag and installs two air vent pipes to assist aerobic decomposition. The entire composting process will take place inside of the elongated thermoplastic bag. The bags are 12 feet in diameter and approximately 185 feet in length and can contain up to 350 tons of feedstock. The bagger is fed from a truck or loader onto a feed table, conveyor or into a hopper, which feeds material to the compaction unit on the bagger. Compaction pressure is controlled b adjusting the breaking 99 P p Y ! 9 9 � resistance on the wheels or backstop cable drum, depending on the model being used. �! The bagged composting system relies on forced aeration of each fully enclosed bag to prevent development of anaerobic conditions and associated odor problems. Aeration pipes ahre inserted into the full length of each bag. Each bag is connected to two blower units that are controlled by an automatic timert manually as con its n i se d o s d ctate. The composting material within each bag acts to a significant degree as its own bio-filter, contributing further to effective odor control. E t • Installing the aerations stem k i Perforated pipe will be installed into the compost bags by feeding the pipe into the bags as filling takes place. Smooth plastic PVC pipe is threaded from the front of the bagging machine through a guide pipe exiting at the desired height and separation inside they tunnel and then through the plastic bag to the blower. The pipe diameter and the perforations will be designed to supply a uniform airflow to the full length of the bag. i Bioaerosols: The primary feedstock for the compost process is green waste. Potential adverse health effects associated with airborne fungal spores, specifically Aspergillus fumigatus and or Aspergillus flavus, have raised concerns I; I2 170.18 Tracy GIMP 121907.doc