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3. Provide a minimum of 8-inch overlap at the seams. <br />4. On long or wide slopes, or slopes subject to wind, tape all seams. <br />5. Place plastic into a small (12-inch wide by 6-inch deep) slot trench at the top of the slope <br />and backfill with soil to keep water from flowing underneath. <br />6. Place sand filled burlap or geotextile bags every 3 to 6 feet along seams and tie them <br />together with twine to hold them in place. <br />7. Inspect plastic for rips, tears, and open seams regularly and repair immediately. This <br />prevents high velocity runoff from contacting bare soil, which causes extreme erosion. <br />8. Sandbags may be lowered into place tied to ropes. However, all sandbags must be <br />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 suitable protection shall <br />be installed at the toe of the slope in order to reduce the velocity of runoff. <br />Maintenance Standards <br />. Torn sheets must be replaced and open seams repaired. <br />. Completely remove and replace the plastic if it begins to deteriorate due to ultraviolet radi- <br />ation. <br />. Completely remove plastic when no longer needed. <br />. Dispose of old tires used to weight down plastic sheeting appropriately. <br />Approved as Functionally Equivalent <br />Ecology has approved products as able to meet the requirements of this BMP. The products did not <br />pass through the Technology Assessment Protocol — Ecology (TAPE) process. Local jurisdictions <br />may choose not to accept these products, or may require additional testing prior to consideration for <br />local use. Products that Ecology has approved as functionally equivalent are available for review on <br />Ecology's website at: <br />https://ecology.wa.gov/Regulations-Permits/Guidance-technical-assistance/Stormwater-per- <br />mittee-guidance-resources/Emerging-stormwater-treatment-technologies <br />BMP C124: Sodding <br />Purpose <br />The purpose of sodding is to establish turf for immediate erosion protection and to stabilize drainage <br />paths where concentrated overland flow will occur. <br />2019 Stormwater Management Manual for Western Washington <br />Volume /I - Chapter 3 - Page 299 <br />