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• <br />• <br />• Construct a horseshoe shaped berm, faced with coarse aggregate if <br />using riprap, 3 feet high and 3 feet wide, at least 2 feet from the inlet. <br />• Construct a horseshoe shaped sedimentation trap on the outside of the <br />berm sized to sediment trap standards for protecting a culvert inlet. <br />Maintenance <br />• Inspect catch basin filters frequently, especially after storm events. <br />Standards <br />Clean and replace clogged inserts. For systems with clogged stone <br />filters: pull away the stones from the inlet and clean or replace. An <br />alternative approach would be to use the clogged stone as fill and put <br />fresh stone around the inlet. <br />• Do not wash sediment into storm drains while cleaning. Spread all <br />excavated material evenly over the surrounding land area or stockpile <br />and stabilize as appropriate. <br />Approved as <br />Ecology has approved products as able to meet the requirements of BMP <br />Equivalent <br />C220. 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 />htip://www.ecy.wa. ov/programs/wq/stormwater/newtech/equivalent.b.tml <br />Volume II — Construction Stormwater Pollution Prevention - August 2012 <br />4-84 <br />