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Figure 1. Placement of Finished Compost Layer (CalRecycle, 2008) <br /> San Joaquin Valley Air Pollution Control District Study <br /> The San Joaquin Valley Air Pollution Control District (SJVAPCD), during the development of Rule <br /> 4566, to limit VOC emissions from material composting operations, conducted a study at the <br /> Tulare County Compost Facility that was similar to the CalRecycle study. The study compared <br /> open windrows without forced aeration with and without a layer of finished compost. The <br /> graph below (Figure 2) is a record of VOC emissions from the control and covered windrows. <br /> The finished compost layer significantly lowered emissions. However, the SJVAPCD, in their <br /> estimates of emission reductions from Rule 4566, conservatively uses a 56% emission reduction <br /> from a finished compost layer on a conventional, turned windrow. <br /> Upcoming CalRecycle Studies <br /> A study is planned for the summer of 2012 to measure compost emission reductions from a <br /> finished compost layer placed over a windrow under positive aeration. <br /> TRACY MRF/TS & CF would like to have the flexibility to use both negative and/or positive <br /> forced aeration in the aerated static pile composting, subject to Local Enforcement Agency and <br /> San Joaquin Valley Air Pollution Control District approval and conditions. <br />