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INTER WEST — EVERETT CONTRACTORS YARD INTERIM FILL PROJECT Sitts & Hill Engineers, Inc. <br />' CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN Job Number 17,733 <br />Design and Installation Specifications <br />' Plastic slope cover must be installed as follows: <br />1. Run plastic up and down slope, not across slope. <br />2. Plastic may be installed perpendicular to a slope if the slope length is less <br />than 10 feet <br />' 3. Minimum of 84nch overlap at 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 <br />of the slope 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 <br />be them together with twine to hold them in place. <br />7. Inspect plastic for rips, tears, and open seams regularly and repair imme- <br />diately. This prevents high velocity runoff from contacting bare soil which <br />' causes extreme erosion. <br />8. Sandbags may be lowered into place tied to ropes. However, all sandbags <br />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 suitable pro- <br />tection shall be installed at the toe of the slope in order to reduce the velocity of run- <br />off. <br />Maintenance Standards <br />- Tom sheets must be replaced and open seams repaired. <br />- Completely remove and replace the plastic if it begins to deteriorate due to ultra- <br />violet radiation. <br />- Completely remove plastic when no longer needed. <br />' - Dispose of old tires used to weight down plastic sheeting appropriately. <br />Approved as Equivalent <br />Ecology has approved products as able to meet the requirements of BMP C123: Plastic <br />Covering. The products did not pass through the Technology Assessment Protocol — <br />Ecology (TAPE) process. Local jurisdictions may choose not to accept this product <br />approved as equivalent, or may require additional testing prior to consideration for local <br />' use. The products are available for review on Ecology's website at <br />httpJ/www.ecy.wa.gov/programs/wq/Stormwater/newtech/eguivalent.htmi <br />2014 Stormwater Management Manual for Western Washington <br />Volume 11- Chapter 4 - Page 295 <br />SITTS & HILL ENGINEERS, INC. 42 <br />' TACOMA, WASHINGTON <br />