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Chapter 4. - Best Mana ement. Practices for Erosion and Sediment Control <br /> Construction Specifications <br /> Straw bale drop inlet filter <br /> 1 . Bales shall be either wire-bound or string-tied with the bindings oriented around the <br /> sides rather than over and under the bales. <br /> 2. Bales shall be placed lengthwise in a single row surrounding the inlet, with the <br /> r ends of adjacent bales pressed together. (See Plate 4 . 08a) <br /> 3, The filter barrier shall be entrenched and backfilled. A trench shall be excavated <br /> r around the inlet the width of a bale to a minimum depth of 4 inches (10 cm) . After <br /> the bales are staked, the excavated soil shall be backfilled and compacted against <br /> the filter barrier. (See Plate 4.08b) <br /> M 4 , Each bale shall be securely anchored and held in place by at least two stakes or <br /> rebars (See p . 4-17) driven through the bale . <br /> g . Loose straw should be wedged between bales to prevent water from entering <br /> between bales . <br /> 8 . Gravel may be spread around the bates to improve stability. <br /> See Plate 4 . 08c) <br /> .. Fabric drop inlet sediment filter <br /> 1 . Fabric shall be cut from a continuous roll to avoid joints . <br /> �. <br /> 2 , Stakes shall be 2" x 4." (5 pm x 10 cm) wood (preferred) or equivalent metal with a <br /> minimum length of 3 feet (90 cm) . (See Plate 4.08d) <br /> rr <br /> 3 . Staples shall be of heavy duty vvire at least 1I2-inch (13 mm) tong. <br /> 4. Stakes shall be spaced around the perimeter of the inlet a . maximum of 3 feet (90 <br /> cm) apart and securely driven into the ground minimum of 8 inches (20 cm) . A <br /> frame of 2" x 4" (5 cm x 10 cm) wood shall be constructed around the top of the <br /> ,. stakes for proper stability. <br /> 5 . A trench shall be excavated approximately 4 inches (10 cm) wide and 4 inches (10 <br /> cm) deep around the outside perimeter of the stakes. (See Plate 4. 08e) <br /> g . The burlap shall be stapled to thewooden stakes , and 8 inches (20 cm) of the fabric <br /> shall be extended into the trench . The height of the filter barrier shall be a minimum <br /> of 15 inches (38 cm) and shall not exceed 18 inches (45 cm). <br /> .. 7 . The trench shall be backfilled and the soil compacted over the burlap . <br /> 4-37 <br /> r <br />