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<br />" .. .. <br /> <br />Sediment-.CtQntrol <br />-Sill t'ences <br /> <br />Description <br /> <br />Geotextile <br />T e <br />Width <br />Grab Tensile ASTM <br />C4632 (machine <br />direction) <br />Apparent Opening Size <br />ASTM 04751 <br />lNStability ASTM <br />04355 500 hours <br />Flow Rate ASTM <br />04491 aVmin/s . ft. <br />Top Fastening <br />Co onent <br /> <br />Net Backin <br /> <br />Material <br /> <br />Steel Wire Gau e <br />Max. Mesh <br /> <br /> <br />Rope for Ditch <br />Check <br />T e <br />Diameter <br /> <br />Posts <br />Material <br />Mininmm Size <br />MinimumLen th <br />Min. Embedment <br />Maximum S acin <br />Post Fastener <br />Minmum Fasteners per <br /> <br />Table 1: Silt Fence Specifications <br />Source: MnDOT, 2000 <br /> <br />Heavy Du <br />Composite of~sh <br />backing, posts, geotexl:ile <br />and fasteners, assembled <br /> <br />Machine Sliced <br /> <br />Preassemb <br />Ready-to-mst <br />geotextile atta <br />driveable os <br /> <br />Machine installed geotextile <br />fastened to posts on site <br /> <br />Woven Woven m:mofilam:nt * Woven <br />48 inches 36 inches 36 inches <br />100 lb. minimum 130 lb. minimum 100 Ib, minimu <br />#20-70 sieve #30AO sieve #20-70 sieve <br />70 percent minimum 70 percent minimum 70 percent mm <br /> <br /> <br />Woven wire PI' h <br />asUc mes <br />mesh <br />14 minimum <br />6 inches 2 inches <br /> <br />~ " {1,1 <br />~ <br />,,;' ~ ~",i ~} <br /> <br />Pol eth lene <br />S/8-inch minimum <br /> <br />Steel T- ost <br />l.26lbsJin./ft, <br />5 feet <br />24 inches <br />8 feet <br />V-sha ed cll s (for both <br />3 (for both woven wire <br /> <br />Steel T- ost with welded late <br />1.26Ibs./in./ft. <br />5 feet <br />24 inches <br />6 feet; 4 feet for ditch checks <br />Plastic zi ties, 50 lb. tensile <br /> <br />Wood <br />2 x2 inch <br />5 feet <br />18 inches <br />6 feet <br />Gun sta les,o <br /> <br />Metropolitan Council I Barr Engineering Co. <br /> <br />3-107 <br />