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Chapter 4 - Best Mane merit Pracdces_for Erosion . and Sediment. Control <br /> r <br /> Block and gravel drop inlet sediment filter <br /> 1 . Place concrete blocks lengthwise on their sides in a single row around the perimeter <br /> of the inlet, with the ends of adjacent blocks abutting . The height of the barrier can <br /> be varied, depending on design needs, by stacking combinations of 4 inch , 8 inch <br /> ` and 12 inch (101 20, and 30 cm) wide blocks . The barrier of blocks shallbeatleast <br /> 12 inches (30 cm) high andno greater than 24 inches (60 cm) high . <br /> ` 2 , Wire mesh shall be placed over the outside vertical face (webbing) of the concrete <br /> blocks to . prevent stone from being washed through theholes in the blocks . <br /> Hardware cloth or comparable wire mesh with 1 /2 inch (13 mm) openings shall be <br /> ' used . (See Plate 4.08g) <br /> N 3 . Stone. shall . be piled against the wire to the tap of the block barrier. Suitable coarse <br /> aggregate shall be used. (See Plate 4. 08h) <br /> 4 . if the stone filter becomes clogged with sediment so that it no longer adequately <br /> performs its function , the stone must be pulled away from the blocks , cleaned and <br /> replaced . <br /> 5 . As a very temporary alternative , pervious burlap bags filled with gravel may be <br /> placed around the inlet provided that there are no gaps between the bags. (See <br /> Plate 4. 08i) <br /> 6 . Either of these two practices may be installed on pavement or bare ground <br /> ' Sod drop inlet sediment filter <br /> q . Sail shall be prepared and sod installed` according to the specifications in SODDING <br /> Section 6 . 67 (ES BMP 1 .67) . <br /> 2 . Sod shall be placed to form a turf . mat covering the soil for a distance of 4 feet <br /> (1 . 2 m) from each side of the inlet structure. (See Plate 4. 08j) <br /> Prefabricated drop inlet intemal filter baa (ACF Silt Sack) <br /> 1 , Remove the grate over the catch basin and insert the filter device , then replace <br /> r <br /> grate to hold the device in position. <br /> 2 . When sediments have accumulated to within one foot (30 cm) of the grate the filter <br /> insert must be removed by a front-end loader orforklift. The filter may be discarded <br /> ' and replaced or it may be emptied , cleaned, and reused . <br /> NOTE: This segment does not constitute a product endorsement. <br /> w 4-41 <br />