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. Side Slope: 2H A V or flatter. <br />Grade: Maximum 5 percent, with positive drainage to a suitable outlet (such as a <br />sediment pond). <br />. Stabilization: Seed as per BMP C120: Temporary and Permanent Seeding (p.278), <br />or BMP C202: Channel Lining (p.338), 12 inches thick riprap pressed into the bank <br />and extending at least 8 inches vertical from the bottom. <br />Inspect diversion dikes and interceptor swales once a week and after every rainfall. <br />Immediately remove sediment from the flow area. <br />Damage caused by construction traffic or other activity must be repaired before the end <br />of each working day. <br />Check outlets and make timely repairs as needed to avoid gully formation. When the <br />area below the temporary diversion dike is permanently stabilized, remove the dike and <br />fill and stabilize the channel to blend with the natural surface. <br />2014 Stormwater Management Manual for Westem Washington <br />Volume 11 - Chapter 4 - Page 333 <br />