ARCHIVED REPORTS_1997 - Laserfiche WebLink

Home Browse Search

Odor Impact Minimization Plan-Compost Facility Tracy Material Recovery Facility and Transfer Station 30703 S. MacArthur Drive, Tracy, California 95377 Biofilters are also constructed and properly sized and maintained for the processing of exhaust air in the negatively-aerated ASP systems. The biofilters are highly effective in the removal of odors, volatile organic compounds, and greenhouse gasses from the exhaust air; they are constructed with irrigation systems to maintain proper moisture levels and monitored regularly to assure the filter media is replaced in a timely manner. 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 by some Californians during the siting and operation of compost facilities. The staff of the CalRecycle, in cooperation with the California Department of Health Services, and Cal/EPA's Office of Environmental Health Hazard Assessment prepared a technical bulletin during 1993, and released the summary of findings in LEA Advisory No. 6 dated December 16, 1993. A properly operated compost facility should not present a health risk from Aspergillus fumigatus. Sound management practices include maintaining moisture, temperature and pH levels, aerating, turning and mixing. Reducing the dispersal of dust and spores is best to control exposure. The uses of water sprays or mists while turning piles, and refraining from turning on windy days will help accomplish this. The operator plans to follow the best management practices (BMP's) outlined in LEA Advisory No 6. These include: • Maintaining the windrows in an aerobic condition through regular aeration and mixing with a compost turner. • Maintaining windrow moisture content between 45 and 60 percent • Maintaining adequate windrow temperatures (above 55 C) throughout the pathogen reduction period (as mandated by 14 CCR §17868.3). Drainage issues: Standing water is a potential source of odors. The pad will be constructed of asphalt concrete or concrete and is sloped to drain at a minimum of 1%. Differential settlement of the pad and storage areas will be minimized through regrading of surfaces as needed. The pad will be maintained to prevent ponding. On-site drainage is controlled by use of drainage ditches surrounding the perimeter of the facility and directing all surface water flow toward the storm water retention basin adjacent to the compost pad, which is maintained to prevent sedimentation and organic loading that could potentially cause odors. Windrows are constructed perpendicular to the slope to facilitate drainage and prevent ponding. Operations Procedures: The maximum storage time is 7 days for incoming green materials feedstock and 48 hours for incoming food waste. The compost cycle will be 90 to 120 days. Should complaints be filed and verified, the storage time could be reduced at certain times of the year when there is a higher percentage 15