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KITTITAS COUNTY SOLID WASTE ON-CALL <br />CLE ELUM TRANSFER STATION TANK REPLACEMENT <br /> SEPTEMBER 2025 Temporary Erosion and Sediment Control <br /> 015713 - 5 <br /> <br />b. Slope Between 2 and 5 Percent: 75 feet (23 m). <br />c. Slope Between 5 and 10 Percent: 50 feet (15 m). <br />d. Slope Between 10 and 20 Percent: 25 feet (7.5 m). <br />e. Slope Over 20 Percent: 15 feet (4.5 m). <br />C. Storm Drain Curb Inlet Sediment Trap: Protect each curb inlet using one of the following <br />measures: <br />1. Filter fabric wrapped around hollow concrete blocks blocking entire inlet face area; use <br />one piece of fabric wrapped at least 1-1/2 times around concrete blocks and secured to <br />prevent dislodging; orient cores of blocks so runoff passes into inlet. <br />2. Straw bale row blocking entire inlet face area; anchor into pavement. <br />D. Storm Drain Drop Inlet Sediment Traps: As detailed on drawings. <br />E. Temporary Splash Pads: Stone aggregate over filter fabric; size to suit application; provide at <br />downspout outlets and storm water outlets. <br />F. Soil Stockpiles: Protect using one of the following measures: <br />1. Cover with polyethylene film, secured by placing soil on outer edges. <br />2. Cover with mulch at least 4 inches (100 mm) thickness of pine needles, sawdust, bark, <br />wood chips, or shredded leaves, or 6 inches (150 mm) of straw or hay. <br />G. Mulching: Use only for areas that may be subjected to erosion for less than 6 months. <br />H. Temporary Seeding: Use where temporary vegetated cover is required. <br />3.04 INSTALLATION <br />A. Traffic-Bearing Aggregate Surface: <br />1. Excavate minimum of 6 inches (150 mm). <br />2. Place geotextile fabric full width and length, with minimum 12 inch (300 mm) overlap at <br />joints. <br />3. Place and compact at least 6 inches (150 mm) of 1 1/2 to 3 1/2 inch (40 to 90 mm) <br />diameter stone. <br />B. Silt Fences: <br />1. Store and handle fabric in accordance with ASTM D4873/D4873M. <br />2. Where slope gradient is less than 3:1 or barriers will be in place less than 6 months, use <br />nominal 16 inch (405 mm) high barriers with minimum 36 inch (905 mm) long posts <br />spaced at 6 feet (1830 mm) maximum, with fabric embedded at least 4 inches (100 mm) <br />in ground. <br />3. Where slope gradient is steeper than 3:1 or barriers will be in place over 6 months, use <br />nominal 28 inch (710 mm) high barriers, minimum 48 inch (1220 mm) long posts spaced <br />at 6 feet (1830 mm) maximum, with fabric embedded at least 6 inches (150 mm) in <br />ground. <br />4. Where slope gradient is steeper than 3:1 and vertical height of slope between barriers is <br />more than 20 feet (6 m), use nominal 32 inch (810 mm) high barriers with woven wire <br />reinforcement and steel posts spaced at 4 feet (1220 mm) maximum, with fabric <br />embedded at least 6 inches (150 mm) in ground. <br />5. Install with top of fabric at nominal height and embedment as specified. <br />6. Do not splice fabric width; minimize splices in fabric length; splice at post only, overlapping <br />at least 18 inches (460 mm), with extra post. <br />7. Fasten fabric to wood posts using one of the following: <br />a. Four nails per post with 3/4 inch (19 mm) diameter flat or button head, 1 inch (25 mm) <br />long, and 14 gauge, 0.083 inch (2.11 mm) shank diameter. <br />b. Five staples per post with at least 17 gauge, 0.0453 inch (1.150 mm) wire, 3/4 inch <br />(19 mm) crown width and 1/2 inch (12 mm) long legs. <br />8. Fasten fabric to steel posts using wire, nylon cord, or integral pockets.