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• %• •• ww <br />9 <br />3. Silt fences may be oonstnictcd with or <br />without suppoiting fences such as snow <br />fences or wire mesh fences. If support fences <br />are included, they should be strong enough to <br />withstand the lo^ from ponded water and <br />trapped sediment The suppon posts should <br />be spaced at 10 feet or less, and should be <br />driven at least 2 feet into the ground. Posts <br />should be 4-inch diameter wood posts or <br />standard steel fence posts weighing not less <br />than 1.3 pounds per lineal foot with a <br />minimum length of 30 inches plus burial <br />depth. <br />5. The fobric should mett the following criteria: <br />4. When a silt fence is installed without a <br />supporting fence, the posts should be spaced <br />at 4 feet or less. Posts should be placed or <br />driven at least 2 feet into the ground. Posts <br />should be 2-inch square or heavier wood <br />posts or standard T- or U-section steel posts <br />weighing not less than 1.0 pound pi^ lineal <br />foot with a minimum length of 30 inches <br />plus burial depth. <br />Property Test Method Reqaircmcol <br />Gnb Strength*ASTM-D-1682 90 lbs. minimum <br />Elongation*ASTM-D-1682 15% min. to 50% <br />max. at 45 lb. <br />Pennioivity ASTM-IM491 0.01 sec.** <br />Apparent <br />Opening Size <br />a <br />CW02215 <br />(Qxpsof <br />Eoginees) <br />30io80(coane <br />soils)** <br />50 to 80 (fine <br />soils)** <br />Ultraviolet <br />Resistance <br />ASTM-D4355 70% minimum <br />Width 36 inches <br />minimum <br />* 12* pa min ttnin nte <br />** Coarr'* widi less than 50 percent of the <br />part^tes passing through a #200 sieve, Gne soils with <br />gieatCT than SO percent of the panicles passing <br />through a #200 sieve. <br />6.3-2 10/89