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Joints in filter fabric shall be spliced at <br />posts. Use staples, wire rings or <br />equivalent to attach fabric to posts <br />2"x2" byy 14 Ga. wire or <br />equivaient, if standard __..._.. <br />strength fabric used �.. <br />Filter fabric01 <br />— <br />6 max Minimum 4"x4" trench <br />Backfill trench with native soil <br />Post spacing may be increased or 3/4"-1.5" washed gravel <br />to 8' if wire backing is used <br />2"x2" wood posts, steel fence <br />posts, or equivalent <br />Figure 4.2.12 — Silt Fence <br />1 <br />Design and • Use in combination with sediment basins or other BMPs. <br />Installation Maximum slope steepness (normal (perpendicular) to fence line) <br />Specifications 1H:1V. <br />• Maximum sheet or overland flow path length to the fence of 100 feet. <br />• Do not allow flows greater than 0.5 cfs. <br />• The geotextile used shall meet the following standards. All geotextile <br />properties listed below are minimum average roll values (i.e., the test <br />result for any sampled roll in a lot shall meet or exceed the values <br />shown in Table 4.23): <br />Table 4.2.3 <br />Geotextile Standards <br />Polymeric Mesh AOS <br />0.60 mm maximum for slit film woven (#30 sieve). 0.30 <br />(ASTM D4751) <br />mm maximum for all other geotextile types (#50 sieve). <br />0.15 mm minimum for all fabric types (#100 sieve). <br />Water Permittivity <br />0.02 sec" minimum <br />(ASTM D4491) <br />Grab Tensile Strength <br />180 lbs. Minimum for extra strength fabric. <br />(ASTM D4632) <br />100 lbs minimum for standard strength fabric. <br />Grab Tensile Strength <br />30% maximum <br />(ASTM D4632) <br />Ultraviolet Resistance <br />70% minimum <br />(ASTM D4355) <br />• Support standard strength fabrics with wire mesh, chicken wire, 2-inch <br />x 2-inch wire, safety fence, or jute mesh to increase the strength of the <br />fabric. Silt fence materials are available that have synthetic mesh <br />backing attached. <br />Volume II — Construction Stormwater Pollution Prevention - December 2014 <br />4-90 <br />