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• w * <br />• • • WW <br />@ <br />3. Sill fences may be constracted with or <br />without supporting fences such as snow <br />fences or wire mesh fences. If support fences <br />are included, they should be strong enough lo <br />withstand the lo^ from ponded water and <br />trapped sediment The support posts should <br />be spaced at 10 feet or less, and should be <br />driven at least 2 feet into the ground. Posts <br />be 4-ioch diameter wood posts or <br />standard steel fexrce 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 />4. When a siltfcnce is installed without a <br />supporting fence, the posts should be spaced <br />at 4 feet or less. Posts should be placed or <br />d.ivcn at least 2 feet iruo the ground. Posts <br />should be 2-inch square or heavier wood <br />posts or standard T- or U-scction steel posts <br />weighing not less than 1.0 pound per lineal <br />foot, with a minimum length of 30 iirches <br />plus burial depth. <br />5. The fabric should meet the following criteria: <br />Property Test h&thod ReqniremcoC <br />Grab Strength*ASTM-D-1682 90 lbs. minimum <br />Elongation*ASTM-I>-1682 15% min. to 50% <br />max. at 45 Ib. <br />Petmioivity ASTM-EM491 0.01 see. ' <br />Apparent <br />Opening Size <br />CW02215 <br />(Corps of <br />Eogmeers) <br />30 to 80 (coarse <br />soils)* * <br />50 to 80 (fine <br />soils)** <br />Ultraviolet <br />Resistance <br />ASTM-IM355 70% minimum <br />Width 36 inches <br />minimum <br />* 12’ per min. strain rate <br />** Coarse with less than 50 peieem of the <br />particles passing through a #200 sieve, Cne soils with <br />greater than 50 percent of the particles passing <br />through a IT200 sieve. <br />6.3-2 10/89 <br />0