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I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> Design and • Plastic slope cover must be installed as follows: <br /> I <br /> I <br /> I <br /> I <br /> I <br /> Installation 1. Run plastic up and down slope, not across slope; <br /> Specifications <br /> 2. Plastic may be installed perpendicular to a slope if the slope length <br /> is less than 10 feet; <br /> 3. Minimum of 8-inch overlap at seams; <br /> 4. On long or wide slopes, or slopes subject to wind, all seams should <br /> be taped; <br /> 5. Place plastic into a small (12-inch wide by 6-inch deep) slot trench <br /> at the top of the slope and backfill with soil to keep water from <br /> flowing underneath; <br /> 6. Place sand filled burlap or geotextile bags every 3 to 6 feet along <br /> seams and pound a wooden stake through each to hold them in <br /> place; <br /> 7. Inspect plastic for rips, tears, and open seams regularly and repair <br /> immediately. This prevents high velocity runoff from contacting <br /> bare soil which causes extreme erosion; <br /> 8. Sandbags may be lowered into place tied to ropes. However, all <br /> sandbags must be staked in place. <br /> • Plastic sheeting shall have a minimum thickness of 0.06 millimeters. <br /> • If erosion at the toe of a slope is likely, a gravel berm, riprap, or other <br /> suitable protection shall be installed at the toe of the slope in order to <br /> reduce the velocity of runoff. <br /> Maintenance • Torn sheets must be replaced and open seams repaired. <br /> Standards <br /> • If the plastic begins to deteriorate due to ultraviolet radiation, it must <br /> be completely removed and replaced. <br /> • When the plastic is no longer needed, it shall be completely removed. <br /> • Dispose of old tires appropriately. <br /> February 2005 Volume ll—Construction Stormwater Pollution Prevention 4-27 <br />