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. Use wire mesh with Y2-inch openings. <br />. Place two concrete blocks on their sides abutting the curb at either side of the inlet <br />opening. These are spacer blocks. <br />. Place a 2x4 stud through the outer holes of each spacer block to align the front <br />blocks. <br />. Place blocks on their sides across the front of the inlet and abutting the spacer <br />blocks. <br />. Place wire mesh over the outside vertical face. <br />. Pile coarse aggregate against the wire to the top of the barrier. <br />Curb and Gutter Sediment Barrier— Sandbag or rock berm (riprap and aggregate) 3 feet <br />high and 3 feet wide in a horseshoe shape. See Figure II-4.2.10 Curb and Gutter Barrier <br />(p 364). <br />. Construct a horseshoe shaped berm, faced with coarse aggregate if using riprap, 3 <br />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 berm sized <br />to sediment trap standards for protecting a culvert inlet. <br />Maintenance Standards <br />. Inspect catch basin filters frequently, especially after storm events. Clean and <br />replace clogged inserts. For systems with clogged stone filters: pull away the <br />stones from the inlet and clean or replace. An alternative approach would be to use <br />the clogged stone as fill and put fresh stone around the inlet. <br />Do not wash sediment into storm drains while cleaning. Spread all excavated <br />material evenly over the surrounding land area or stockpile and stabilize as appro- <br />priate. <br />Approved as Equivalent <br />Ecology has approved products as able to meet the requirements of BMP C220: Storm <br />Drain Inlet Protection. The products did not pass through the Technology Assessment <br />Protocol — Ecology (TAPE) process. Local jurisdictions may choose not to accept this <br />product approved as equivalent, or may require additional testing prior to consideration <br />for local use. The products are available for review on Ecology's website at <br />http://www.ecy.wa.gov/programs/wq/stormwater/newtech/equivalent.html <br />2014 Stormwater Management Manual for Westem Washington <br />Volume 11 - Chapter 4 - Page 362 <br />