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ensures that the materials will be processed in the order received and minimizes anaerobic conditions which can create odors. Green wastes, wood wastes and salvageable lumber wiH be stacked separately. Priority processing will be given to large quantities of green grass cuttings or any other material capable of rapidly turning anaerobic. 2. MAIERLkL PREPARATION Acceptable green wastes and wood wastes will be shredded and ground by an industrial-sized tub grinder located in the Grinding Area. Materials will be moistened prior togrinding to minimize dust. A front-end loader will move the materials from the Unloading Area to the Grinding Area on a first-in, first-out basis. Materials will be placed in the tub grinder by loader or knuckleboom. Some materials such as wet leaves and grass, which tend to clog a tub-grinder, will be mixed with dry, carbonaceous materials prior to grinding. Such materials may be transported directly to the Windrow Area for immediate mixing and windrowing to minimize anaerobic conditions. Materials will be placed in the tub grinder in an order that creates an optimum mix of materials for the particular product to be produced. Green wastes, wood wastes and any additive will be mixed and ground together to achieve optimum composting mixes with carbon to nitrogen ratios (C:N) of 25:1 to 30:1. On other occasions wood waste will be ground separately for such products as landscape chips, mulch and co-generation fuel. Contamination levels in the materials will be an important factor in determining the grinding procedures. Clean materials will be mixed in the tub grinder. Contaminated materials such as wooden pallets with nails and other metals will be ground, separated and transferred to a screen where the contaminant will be removed. Materials will be reduced to sizes of 1/4" - 4" based upon the type of material and the product to be produced. The tub grinder will be connected to a water delivery system for dust control and the addition of moisture to composting mixes to achieve optimum conditions of 50% - 60% moisture content by weight. Ground materials will be discharged from the tub grinder to the screen, roll-off container, truck or loader, depending on the next required processing function. This equipment will be located in the Grinding Area as shown in Figure 7. Ground materials conveyed to the screen will be separated into various sizes, depending on the WPR0JECT/397/M"IRCI-4.TCY FebruM 1, 19% 25