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t <br /> 4: <br /> i <br /> ! Place coarse aggregate over the wire mesh, <br /> Provide at least a 12-inch depth of gravel over the entire inlet opening <br /> 1 and extend at least 1 S-inches on all sides. <br /> Catchbasin Filters—Use inserts designed by manufacturers for <br /> f ! construction sites. The limited sediment storage capacity increases the <br /> amount of inspection and maintenance required,which may be daily for <br /> heavy sediment loads. To reduce maintenance requirements combine a <br /> catchbasin filter with another type of inlet protection. This type of inlet <br /> t protection provides flow bypass without overflow and therefore may be a <br /> E better method for inlets located along active rights-of-way. <br />[ l • Provides 5 cubic feet of storage. <br /> • Requires dewatering provisions. <br />[ Provides a high-flow bypass that will not clog under normal use at a <br /> construction site. <br /> _. Insert the catchbasin filter in the catchbasin just below the grating. <br /> f <br /> Curb Inlet Protection with Wooden Weir•—Barrier formed around a curb <br /> inlet with a wooden frame and gravel. <br /> F Use wire mesh with %-inch openings. <br />(( <br /> • Use extra strength filter cloth. <br />[ 3 <br /> Construct a frame. <br /> Attach the wire and filter fabric to the frame. <br />€ Pile coarse washed aggregate against wire/fabric. <br /> • Place weight on frame anchors. <br /> I Block and Gravel Curb Intel Protection—Barrier formed around a curb <br /> inlet with concrete blocks and gravel. See Figure 4.2.9. <br /> Use wire mesh with '/z-inch openings. <br /> • Place two concrete blocks on their sides abutting the curb at either side <br /> i of the inlet opening. These are spacer blocks. <br /> Place a 2x4 stud through the outer holes of each spacer block to align <br /> the front blocks. <br /> • Place blocks on their sides across the front of the inlet and abutting the <br /> spacer 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 <br /> aggregate) 3 feet hi h and 3 feet wide in a horseshoe shape. See Fi iEc <br /> E g p • _ <br /> 4.2,10. <br /> j Volwne H—Construction Stonnivaler Pollution Prevention-August 2012 <br /> 4-83 <br /> t I <br /> I <br />