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• <br /> CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> 111 <br /> g. The depth of the gravel should be at least 12 inches over the entire inlet opening and <br /> extend at least 18 inches on all sides. 411 <br /> 4. Curb Inlet Protection with Wooden Weir—Barrier formed around a curb inlet with a wooden <br /> frame and gravel. • <br /> a. Wire mesh with one-half-inch openings • <br /> b. Extra strength filter cloth * <br /> c. Construct a frame • <br /> d. Attach the wire and filter fabric to the frame <br /> e. Pile coarse washed aggregate against wire/fabric 411 <br /> 411 <br /> f. Place weight on frame anchors. <br /> 5. Block and Gravel Curb Inlet Protection—Barrier formed around an inlet with concrete blocks <br /> and gravel. See DCSS Drawing#211. <br /> a. Wire mesh with one-half-inch openings. <br /> b. Place two concrete blocks on their sides abutting the curb at either side of the inlet <br /> opening. These are spacer blocks. <br /> c. Place a 2 x 4 stud through the outer holes of each spacer block to align the front blocks. 411 <br /> d. Place blocks on their sides across the front of the inlet and abutting the spacer blocks. 41 <br /> e. Place wire mesh over the outside vertical face. <br /> f. Pile coarse aggregate against the wire to the top of the barrier. <br /> 6. Inlet Fabric Fence Filter—DCSS Drawing#212 provides an illustration of the use of filter fabric • <br /> as an inlet protection option. <br /> Maintenance Standards • <br /> 1. Catch basin filters should be inspected frequently, especially after storm events. If the insert <br /> becomes clogged, it should be cleaned or replaced. <br /> 2. For systems using stone filters: If the stone filter becomes clogged with sediment, the stones • <br /> must be pulled away from the inlet and cleaned or replaced. Since cleaning of gravel at a <br /> construction site may be difficult, an alternative approach would be to use the clogged stone as • <br /> fill and put fresh stone around the inlet. <br /> 3. Do not wash sediment into storm drains while cleaning. Spread all excavated material evenly fib <br /> over the surrounding land area or stockpile and stabilize as appropriate. S <br /> 3.3.12 BMP C230: Straw Bale Barrier S <br /> Purpose 411 <br /> 1. To decrease the velocity of sheet flows and intercept and detain small amounts of sediment from 4111 <br /> disturbed areas of limited extent, preventing sediment from leaving the site. See Figure 3.3. • <br /> 2. Below disturbed areas subject to sheet and rill erosion. i <br /> 3. Straw bales are among the most used and least effective BMPs. The best use of a straw bale is • <br /> hand spread on the site. <br /> 43 <br /> Volume 11— Construction Stormwater Pollution Prevention <br /> 3-51 <br /> • <br />