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'The following method should be used to construct a filter fence sediment <br />barrier. <br /> <br />the ground. Cut filter fabric from a continuous roll to <br />avoid having joints. Where joints are necessary, splice the <br />fabric only at a post, with at least a 6 inch overlap, and <br />fasten both ends securely to the post. <br />? Fasten mesh to uphill side of posts with staples or wire. <br />extend mesh to bottom of trench. (Do not attach mesh or <br />fabric to trees.) <br />s• Space posts no more than 10' apart and drive them <br />at least I' into the ground. align the fence along the <br />slope of the contour, curving it slightly uphill to <br />avoid end runs. <br />? The fabric should not extend more than 3 feet above <br />%I" AvrrwW <br />YM Y- 4 <br />w¢ +aeav. <br />Dig a 4" x 4" trench on the uphill side of the fence. <br />? Backfill trench and + <br />compact the soil. (.? <br />j? 5 3+ Note: Filter fences <br />will not withstand high-volume <br />and high wind environments and <br />often require higher maintenance. <br />The following method should be used <br />to construct a sandbag sediment barrier. <br />? Place a row of sandbags from the top of the curb to at least 3 feet into the <br />driveway. Curve the barrier so the ends point uphill. <br />? Place a second layer of bags <br />overlapping the first. Press the bags <br />tightly together to eliminate any <br />spaces between the bags. _ <br />? Place a third layer of bags on top <br />leaving a 6 inch wide spill way near <br />the center of the row. <br />? If the driveway is unpaved, construct <br />a rock apron below the downhill APR" <br />side of the spillway (see section on <br />outlet protectors). <br />? Add I or 2 more layers of bags, if necessary, to accommodate higher flow. <br />If using more than 3 layers, place a second row of bags behind the first for <br />reinforcement. Leave a gap in the top layer as a spillway. <br />For a straw bale sediment barrier, use straw bales (bound with wire <br />or twine) and wood or steel stakes, minimum4-foot long (2" X 2" wood, <br />re-bars or steel pickets), 2 stakes per bale. <br />? For a filter fence, use filter fabric (42 inches wide, tensile strength = <br />120 lbs., equivalent opening size 70); posts, minimum 5 feet long (4" X <br />4" wood or 1.3 lbs/ft steel); wire mesh (42 inches wide, 6 inch mesh <br />maximum, 14-guage wire minimum); staples for wood posts (heavy <br />11 <br />