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Chapter 4 : Best Management Practices for Erosion and Sediment Control <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 refer to 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 /> 4-17 <br />