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. Use wire mesh with '/2-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 11-4.2.10 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.qov/programs/wq/stormwater/newtech/eq uival ent.html <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume ll- Chapter 4 -Page 362 <br />