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40 <br />• <br />r . <br />4. Stakes for Filter Barriers shall be 1" x 2" wooed (preferred) or <br />equivalent metal with a minimum length of 3 Feet, <br />5. Wire fence reinforcement for silt fences using standard strength <br />filter cloth shall be a minimum of 36 inches in height, a minimum of <br />14 gauge and shall have a maximum mesh spacing of 6 inches. <br />Filter Barrier: This sediment barrier may be constructed using burlap <br />or standard strength synthetic filter fabric. It is designed for low or <br />moderate flows not exceeding 1 cfs. See Plate 1.06a. <br />1. The height of a filter barrier shall be a minimum of 15 inches and <br />shall not exceed 18 inches. <br />2.. Burlap or standard strength synthetic filter fabric shall be <br />purchased in a continuous roll and cut to the length of the barrier <br />to avoid the use of joints (and thus improve the strength and <br />efficiency of the barrier). <br />3. The stakes shall be spaced a maximum of 3 feet apart at the barrier <br />�. locution and driven securely into the ground (minimum of 8 inches). <br />�• 4. A trench shall be excavated approximately 4 inches wide and 4 inches <br />deep along the line of stakes and upslope from the barrier. <br />5. The filter material shall be stapled to the wooden stakes, and 8 <br />inches of the fabric shall be extended into the trench. Heavy duty <br />wire staples at least 112 -inch long shall be used. Filter material <br />shall not be stapled to existing trees, <br />6. The trench shall be backfilled and the soil compacted over the filter <br />material. <br />7. 1f a filter barrier is to be constructed across a ditch line or <br />Swale, the barrier shall be of sufficient length to eliminate end <br />flow, and the plan configuration shall resemble an arc or horseshoe <br />with the ends oriented upslope (Plate 1,46b). <br />8. Filter barriers shall be removed when they have served 'their useful <br />purpose, but not before the upslope area has been permanently <br />stabilized. <br />Silt fence: This sediment barrier utilizes standard strength or extra <br />strength synthetic filter fabrics. It is designed for situations in which <br />only sheet or overland flaws are expected. See Plate 1.06c. <br />I. The height of a silt fence shall not exceed 36 inches (higher fences <br />may impound volumes of water sufficient to cause failure of the <br />structure). <br />6- 318 <br />1 <br />