Laserfiche WebLink
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 <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 tie them together with twine to hold them in 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 <br />• Torn sheets must be replaced and open seams repaired. <br />Standards <br />• Completely remove and replace the plastic if it begins to deteriorate <br />due to ultraviolet radiation. <br />• Completely remove plastic when no longer needed. <br />• Dispose of old tires used to weight down plastic sheeting <br />appropriately. <br />Approved as <br />Ecology has approved products as able to meet the requirements of BMP <br />Equivalent <br />C 123. The products did not pass through the Technology Assessment <br />Protocol — Ecology (TAPE) process. Local jurisdictions may choose not <br />to accept this product approved as equivalent, or may require additional <br />testing prior to consideration for local use. The products are available for <br />review on Ecology's website at <br />http:/.!NNAvw.ecy.wa. Gov/pro,,rams/wq/sormwater/newtech/equivalent.html <br />BMP C124: Sodding <br />Purpose The purpose of sodding is to establish permanent turf for immediate <br />erosion protection and to stabilize drainage ways where concentrated <br />overland flow will occur. <br />Conditions of Use Sodding may be used in the following areas: <br />• Disturbed areas that require short-term or long-term cover. <br />Disturbed areas that require immediate vegetative cover. <br />• All waterways that require vegetative lining. Waterways may also be <br />seeded rather than sodded, and protected with a net or blanket. <br />Volume II — Construction Stormwater Pollution Prevention - December 2014 <br />4-2 7 <br />