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The base of both end posts must be at least 2- to 4-inches above the <br />top of the filter fabric on the middle posts for ditch checks to drain <br />properly. Use a hand level or string level, if necessary, to mark <br />base points before installation. <br />2. Install posts 3- to 4-feet apart in critical retention areas and 6- to 7- <br />feet apart in standard applications. <br />3. Install posts 24-inches deep on the downstream side of the silt <br />fence, and as close as possible to the filter fabric, enabling posts to <br />support the filter fabric from upstream water pressure. <br />4. Install posts with the nipples facing away from the filter fabric. <br />5. Attach the filter fabric to each post with three ties, all spaced <br />within the top 8-inches of the filter fabric. Attach each tie <br />diagonally 45 degrees through the filter fabric, with each puncture <br />at least 1-inch vertically apart. Each tie should be positioned to <br />hang on a post nipple when tightening to prevent sagging. <br />6. Wrap approximately 6-inches of fabric around the end posts and <br />secure with 3 ties. <br />7. No more than 24-inches of a 36-inch filter fabric is allowed above <br />ground level. <br />Compact the soil immediately next to the filter fabric with the front <br />wheel of the tractor, skid steer, or roller exerting at least 60 pounds <br />per square inch. Compact the upstream side first and then each side <br />twice for a total of four trips. Check and correct the silt fence <br />installation for any deviation before compaction. Use a flat -bladed <br />shovel to tuck fabric deeper into the ground if necessary. <br />• <br />Volume II — Construction Stormwater Pollution Prevention - August 2012 <br />4-92 <br />