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Report of Composting Site Information <br /> Tracy Material Recovery& Transfer Facility <br /> 30703 S. MacArthur Drive, Tracy, Ca. 95377 <br /> Anaerobic digestion digestate that has already undergone several days of in-vessel <br /> composting prior to delivery to the Tracy MRF may be composted in windrows if there <br /> are not odor problems. If the already composted digestate does produce an odor <br /> problem then it will be placed in the aerated static pile system. <br /> Tracy MRF will keep the windrowed material at a temperature between 131 and 160 <br /> degrees Fahrenheit for a fifteen-day period, turning the windrows a minimum of five <br /> times throughout those fifteen days in order to reduce pathogens. Each day during the <br /> pathogen reduction period, at least one temperature reading will be taken a minimum of <br /> every 150 feet of windrow and the temperatures will be taken 12 to 24 inches below the <br /> pile surface. Tracy MRF will keep accurate records of the fifteen-day pathogen reduction <br /> period, plus all other temperature records, until each windrow reduces to a temperature <br /> below 131 degrees Fahrenheit. The temperature records will be stored at the onsite <br /> office. After the fifteen-day pathogen reduction period, Tracy MRF will continue to turn <br /> the windrows as needed, approximately every three to seven days; the composting time <br /> will typically take two to three months. Tracy MRF will also conduct temperature <br /> monitoring on all piles of compostable materials that are greater than 6 feet in height. <br /> The monitoring will be conducted weekly and will be documented in the operating <br /> records. In the event that any pile has a temperature greater than 175 degrees <br /> Fahrenheit, Tracy MRF will take appropriate measures to cool the pile down (e.g. <br /> spread the pile out, add water, or process by grinding and screening) and will monitor <br /> the pile daily until the temperature drops below 175 degrees Fahrenheit. <br /> • Food Waste <br /> Food waste rich feedstocks would be blended with green waste to achieve a blend of up <br /> to about 40% food waste, and would be composted using covered aerated static pile <br /> compost methods. Aerated static piles would be covered either with an impermeable <br /> cover and/or finished compost (or compost overs) to control emissions and storm water <br /> infiltration. The active compost will be maintained at a temperature of 55 degrees <br /> Celsius (131 degrees Fahrenheit) or higher for a pathogen reduction period of at least 3 <br /> days. <br /> • Digestate <br /> Anaerobic digestion digestate that has not undergone in-vessel composting prior to <br /> delivery will be placed in the aerated static pile system. <br /> Finished Compost <br /> The finished compost will be screened, with the smaller diameter material being used as <br /> soil amendment and the larger diameter material being sold for biomass or reground <br /> and screened. During the screening process, metals will be screened out using a <br /> magnet attached to the screen and grinder. The metals screened out of the material will <br /> be containerized and delivered to an appropriate facility for additional processing or <br /> disposal. Finished compost may be blended with the aforementioned additives or <br /> amendments prior to delivery to markets. Tracy MRF will test for heavy metals and <br /> pathogens for every 5,000 cubic yards of compost produced, in accordance with 14 <br /> CCR 17868.1, 17868.2, & 17868.3. The compost samples are analyzed for physical <br /> 21 <br />