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Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> r <br /> 7. When extra strength filter fabric and closer post spacing are used , the wire mesh <br /> support fence may be eliminated. In such a case , the filter fabric is stapled or <br /> "■ wired directly to the posts with all other provisions of item No . 6 applying . <br /> 8 . When attaching two silt, fenIces together, place the end post of the second fence <br /> inside the end post of the first fence. Rotate both posts at least 180 degrees on a <br /> clockwise directlori to create a tight seat with the filter fabric. Drive both pasts_ into <br /> +r. <br /> the ground and bury the flap. (See Plate 4 .06g) <br /> 9 , The french shall be - backfilled and the soil compacted over the filter fabric . <br /> 10 . The most effective application consists of 'a double row of silt fences spaced a <br /> minimum of three feet apart. The._ three foot :separation is so that if the first row <br /> collapses it will not fall on the second row. - Wire 'or. synthetic mesh is may be used <br /> Ow to reinforce the first row. (See Plate 4.06c) <br /> 11 . When used to , control sediments from a steep slope , sill ferices should. be placed <br /> Om away from the toe of the slope for increased holding capacity. ' (See Plate 4 . 06f) <br /> 12. Silt fences shall be removed when they have served their useful purpose , but not <br /> before the upslope area has been permanently stabilized . <br /> i <br /> Channel Flow Applications <br /> 1 . If a filter barrier is to be constructed across a ditch line or swale ; the barrier shall of <br /> sufficient .length such that the bottom of the end sections of fence are higher in <br /> elevation than the top of the center section to eliminate end flow. : The pian <br /> configuration shall resemble an arc or horseshoe with the ends oriented upslope. <br /> (See Plate 4 .06b) . <br /> 2. Use FDOT Standard Index 102 , Chart 1 (Plate 4.06a) as a guide for spacing . <br /> 41 3 . The remaining steps for installing a filter barrier for sheet flow applications apply <br /> here. <br /> Maintenance <br /> 1 . Silt fences and filter barriers shall be inspected immediately after each rainfall and <br /> at least daily during prolonged rainfall. Any required repairs shall be made <br /> immediately. <br /> 2 . Should the fabric on a silt fence or filter barrier decompose or become ineffective <br /> before the end of the expected usable life and the barrier still be necessary, the <br /> fabric shall be replaced promptly. <br /> 3. Sediment deposits should be removed after each storm event. They must be <br /> removed when deposits reach approximately. one-half the height of the barrier. <br /> 4-27 <br />