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r� <br />U <br />• <br />Joints in filter fabric shall be spliced at <br />posts. Use staples,. wire rings or` <br />equivalent to attach fabric to posts by 14 a. wire or <br />p equivalent: if standard :... <br />1-If T^ W__._ strength fabric used <br />I i 1T <br />{ Filter fabric <br />l ( { <br />3 <br />.. i <br />-m5 rriax Minimum 4"A"trench <br />i i f e <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, steal fence <br />pasts, or equivalent <br />Design and <br />Installation <br />Specifications <br />Figure-4.2.12 — Silt Fence <br />E <br />:cv <br />.S <br />E <br />• Use in combination with sediment basins or other BMPs. <br />• Maximum slope steepness (normal (perpendicular) to fence line) <br />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 4.2.3): <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 />1001bs 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 />Volume II— Construction Stormwater Pollution Prevention - August 2012 <br />4-89 <br />