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Valley Organics, Inc. <br />Application — Site Approval Exhibit A <br />Odor Management Impact Plan <br />This facility would process only greenwastes from commercial landscape <br />maintenance. Odor management controls would be implemented according to <br />industry practice. The following list encompasses the most prevalent industry <br />practices and is in order of effectiveness as ranked by California operators, <br />according to a state-wide survey conducted by California Polytechnic University, <br />San Luis Obispo and California Integrated Waste Management Board: <br />1. Reducing the amount of time the greenwaste is stored. Valley Organics <br />raw material would be delivered directly from landscape maintenance <br />operations, and processed within 48 hours. <br />2. Refusal to accept certain types of waste. Material to be processed at this <br />site will be greenwaste from landscape maintenance, delivered directly to <br />the site on a regular basis. Curbside greenwaste, which may lie at the <br />curb for days, and has been found to create the most odor problems, will <br />not be accepted. <br />3. Managing moisture. The composting process requires moisture to be <br />applied to the greenwaste, but this can be carefully controlled, given that <br />the average rainfall in the site area is only 12 inches per year. <br />4. Turning windrows at certain times of day. It is expected that the <br />windrows will be turned on an average of twice a week. Available <br />information indicates that turning the windrows in the morning would <br />minimize odor and release of particulates. Also, turning would be <br />postponed on windy days. <br />5. Managing C.•N ratio. The ideal ratio for composting is considered to be 30 <br />parts carbon for 1 part nitrogen by weight. Grass clippings are rated at <br />15-25:1. The ratio can be optimized by adding dry leaves, straw, wood <br />chips or sawdust during processing. <br />Other odor management controls that will be used by Valley Organics, include: <br />Managing the pH of the material. <br />Using public outreach programs to educate neighbors about the operation. <br />And, if odor becomes a problem, odor neutralizing or masking agents <br />would be used. <br />