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Turning will be scheduled to provide compliance with pathogen reduction requirements and maintain aerobic conditions. Water Usage. Water will be added to the piles as necessary before turning to maintain efficient composting. Water will also be used to control dust from the compost pad and various composting operations such as grinding and screening as determined from experience. S. Grading Plan Provide a schematic drawing of the grading plan for the site. Indicate how this design will prevent ponding and control runoff. The grading plan (Exhibit 3) shows the proposed grading of the site. The grading plan is the same for all of the potential composting options. A 1-percent minimum grade is pro- vided at all points in the composting site. The composting Windrows are arranged normal to the site slope to allow free drainage and minimize ponding. The composting pad will be constructed of compacted native soils. These soils are silt and clay and when compacted will provide a composting pad of low permeability. During periods of wet weather the composting facility may suspend composting operations to prevent damage to the compost- ing pad. Alternatively, economics may allow construction of a gravel surfaced or asphalt paved composting pad to allow continuous operations. During periods of extreme wet weather the composting facility may not accept wastes. The site is sloped to drain to two ditches designed to carry the water from the 25-year 10-minute duration storm (0.25 inches, 1.5 inches per hour) assuming all the water that falls on the composting site runs off. The ditches will carry the water to a retention pond designed to hold the net average annual rainfall during months where rainfall exceeds evap- oration (5.67 inches) assuming all the water that falls on the site runs off. This exceeds the 25-year, 24-hour rainfall event (2.28 inches). 6. Pad Composition and Dimensions Active composting areas consisting solely of compacted soils shall be constructed such that the compacted soil layer is of sufficient thickness to ensure the integrity of the bottom 1 foot of compacted soil from the effects of composting operations. Facilities that use amendments or additives must have a layer with a permeability of no greater than 1 x 10' or other standard allowed in writing by the regional board. The Compost Facility pad will be constructed of low permeability compacted native soil. It is anticipated that the compacted native soil will provide adequate protection of ground- water. The compost pad area is sized to accommodate each of the selected composting technologies. The pad will be up to 15 acres. The curing/screening/product storage area will be up to 8 acres. 9 a10029B64.wp5/31 9/n/% 31