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Project Description— Report of Composting Site Information Tracy Materlal Recovery Facility and Transfer Station 30703 S. MacArthur Drive, Tracy, California 95377 be handled as previously described. This will aid in reducing the overall residual percentage generated through the in-vessel composting method. • Composting Process Overview The compostable materials will be processed in a portable grinder and/or trommel screen in the processing area for blending and deposited directly into the static piles. A front-end loader will be used to feed the material into the grinder or trommel. A mixer may also be used for blending. The processed material will be formed into elongated piles over a computer controlled aeration system for on-site composting as shown on the Site Plan. • The material is formed into trapezoidal-shaped piles of approximately 30 feet wide, 15 feet high, and 100 feet in length. Piles are separated by a minimum 8-foot wide access road for loading, monitoring, watering, moving, and turning. The pile layout for the operations is generally west to east as illustrated in Site Plan. • The identity of each ASP is designated by an identification number in the control system and on the operations diagram. All information pertaining to each pile will be calculated and stored in the computerized control system (and documented in site records)which will allow instant identification of pile status (e.g. start date, temperature readings and historical profile, air flow, and sampling) and allow site personnel to isolate material waiting testing results. • The temperature and moisture of the ASP materials will be monitored and controlled, and the piles turned on a 15-day cycle so that the composting process is maintained and evenly distributed to all materials. A front-end loader will be used to move the ASPs. ASPs will be maintained to meet the time and temperature requirements as discussed below for an anticipated period of 60 days. • Water will be added as necessary to the ASPs to maintain the appropriate composting moisture. Handheld hoses will be used to spray water under the weatherproof covers, as needed to maintain optimum composting conditions. The frequency of spray irrigation will vary with the season and moisture content of feedstock materials. A water truck may also be used to control dust generation during grinding or screening and be available for fire protection. • During the pathogen reduction phase, the controlled aeration process in the covered ASP method provides sufficient oxygen to sustain the biological activity and keep the material at a temperature of 55 degrees Celsius (131 degrees Fahrenheit), or higher, for a period of 3 days, or longer, which meets regulatory pathogen reduction requirements (14 CCR §17868.3). There will be a minimum of 2 rotations of the ASP during a 45-day period during which readings such as temperature and oxygen content are monitored and documented on a continual basis. For management purposes, upon completion of the pathogen reduction phase, temperature of the windrows is measured automatically and aeration flow rates are adjusted by the control system as needed to properly manage the composting process; minimize fire danger, and produce optimum end product. When the desired level of decomposition 47 Edgar&Associates,Inc. Tracy Compost Fac ProjDasc042310