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Chanter 4: Best Management Practices for Erosion and Sediment Control <br />n <br />Desiarf Criteria <br />i A formal design is not required for many small projects and for minor or incidental <br />applications. For larger projects referto Figure 4.05a (FDOT Standard Index 102, Chart 1) <br />• for guidance on recommended spacing. <br />Construction Specificattons <br />Sheet Flow Applications <br />.� 1. Bales shall be placed in a single. row, lengthwise on the contour, with ends of <br />adjacent bales tightly abutting each other. <br />• 2. All bales shall be either wire -bound or string -tied: Straw bales shalt be installed so <br />that bindings are oriented around the sides rather than along the tops. and <br />bottoms of the bales (in order to prevent deterioration of the bindings). (See Plate <br />• 4.05b) <br />3. The barrier shall be entrenched and backfilled. A trench shall be excavated. the <br />,., width of a bale and the length.of the proposed barrier to a minimum depth of 4 <br />inches (10 cm). After the bales are staked and chinked, the excavated soil shall be <br />backfilled against the barrier. Backfill soil shall conform to the ground level on the <br />., downhill side and shall be built up to 4 inches (10 cm) against the uphill side of the <br />barrier (See Plate 4.05c) <br />,. 4. Each bale shall be securely anchored by at least two 2" x 2" (5 cm x. 5 cm) <br />minimum wooden stakes or two #5 (16 mm) minimum rebars at least 3 feet (0.9 m) <br />driven through the bale. The first stake in each bale shall be driven toward the <br />previously laid bale to force the bales together. Stakes or rebars shall be driven <br />deep enough into the ground to securely anchor the bales.Straw bale barriers <br />placed on paved surfaces may be secured by .placing heavy sand bags on top, <br />and/or by bracing with 2_x 4's (5 x 10 cm). (See Plate 4.054) <br />5. The gaps between bales shall be chinked (filled by wedging) with straw to prevent <br />water from escaping between the bales. (See Plate 4.05b) Loose straw <br />scattered over the area immediately uphill from a straw bale barrier tends to <br />increase barrier efficiency. <br />6. When bales are installed atthe toe.of a slope, they should be placed away from the <br />slope for increased. storage capacity. (See Plate 4.05e) <br />~ 7. Inspection shall be frequent and repair or replacement shall be made promptly as <br />needed. <br />8. Straw bale barriers shall be removed when they have served their usefulness, but <br />not before the upslope areas have been permanently stabilized. <br />Iii <br />W <br />