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Steel posts shall consist of either size No. 6 rebar or larger,ASTM A <br /> 120 steel pipe with a minimum diameter of 1-inch, U,T, L, or C shape <br /> steel posts with a minimum weight of 1.35 lbs./ft. or other steel posts <br /> having equivalent strength and bending resistance to the post sizes <br /> ' list . he n of uo pos al mm <br /> Fenceed bacTk-upspaci supportg the,if usedspp,shall cost nsistshl ofbe steeal wire <br /> um withof a6 feet. <br /> maximum mesh spacing of 2 inches, or a prefabricated polymeric <br /> mesh. The strength of the wire or polymeric mesh shall be equivalent <br /> to or greater than 180 lbs. grab tensile strength. The polymeric mesh <br /> must be as resistant to ultraviolet radiation as the geotextile it supports. <br /> ' o Silt fence installation using the slicing method specification details <br /> follow. Refer to Figure 4.20 for slicing method details. <br /> The base of both end posts must be at least 2 to 4 inches above the top <br /> of the silt fence fabric on the middle posts for ditch checks to drain <br /> properly. Use a hand level or string level,if necessary,to mark base <br /> points before installation. <br /> Install posts 3 to 4 feet apart in critical retention areas and 6 to 7 feet <br /> ' apart in standard applications. <br /> Install posts 24 inches deep on the downstream side of the silt fence, <br /> and as close as possible to the fabric, enabling posts to support the <br /> fabric from upstream water pressure. <br /> Install posts with the nipples facing away from the silt fence fabric. <br /> ' Attach the fabric to each post with three ties, all spaced within the top <br /> 8 inches of the fabric. Attach each tie diagonally 45 degrees through <br /> the fabric,with each puncture at least 1 inch vertically apart. In <br /> ' addition, each tie should be positioned to hang on a post nipple when <br /> tightening to prevent sagging. <br /> Wrap approximately 6 inches of fabric around the end posts and secure <br /> with 3 ties. <br /> No more than 24 inches of a 36-inch fabric is allowed above ground <br /> ' level. <br /> The rope lock system must be used in all ditch check applications. <br /> ' The installation should be checked and corrected for any deviation <br /> before compaction. Use a flat-bladed shovel to tuck fabric deeper into <br /> the ground if necessary. <br /> Compaction is vitally important for effective results. Compact the soil <br /> immediately next to the silt fence fabric with the front wheel of the <br /> tractor, skid steer, or roller exerting at least 60 pounds per square inch. <br /> Compact the upstream side first and then each side twice for a total of <br /> four trips. <br /> February 2005 Volume II--Construction Stormwater Pollution Prevention 4-97 <br />