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"r Florida Erosion and Sediment Control Inspector's Manual <br /> r. 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 be varied , <br /> depending on design needs , by stacking combinations of 4 inch , 8 inch and 12 inch ( 1. 0 , 20 , <br /> and 30 cm ) wide blocks . The barrier of blocks shall be at least 12 inches (30 cm ) high and <br /> no 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 the holes in the blocks . Hardware <br /> cloth or comparable wire mesh with 1 /2 inch ( 13 mm ) openings shall be used . (See Plate <br /> 4 . 088 ) <br /> 3 . Stone shall be piled against the wire to the top of the block barrier. Suitable coarse <br /> aggregate shall be used . (See Plate 4 . 08h ) <br /> r. <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 placed <br /> .•r around the inlet provided that there are no gaps between the bags . (See Plate 4 . 081 ) <br /> 6 . Either of these two practices may be installed on pavement or bare ground <br /> Sod drop inlet sediment filter <br /> 1 . Soil 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 internal filter bag (ACF Silt Sack) <br /> 1 . Remove the grate over the catch basin and insert the filter device , then replace <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 or forklift . 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 /> 4-42 <br />