Laserfiche WebLink
. Storm drain inlets shall be protected to prevent sediment-laden water entering the <br /> storm drain system (see BMP C220: Storm Drain Inlet Protection (p.357)). <br /> Maintenance Standards <br /> Inspect stabilized areas regularly, especially after large storm events. <br /> Crushed rock, gravel base, etc., shall be added as required to maintain a stable driving <br /> surface and to stabilize any areas that have eroded. <br /> Following construction, these areas shall be restored to pre-construction condition or bet- <br /> ter to prevent future erosion. <br /> Perform street cleaning at the end of each day or more often if necessary. <br /> BMP C120: Temporary and Permanent Seeding <br /> Purpose <br /> Seeding reduces erosion by stabilizing exposed soils.A well-established vegetative <br /> cover is one of the most effective methods of reducing erosion. <br /> Conditions of Use <br /> Use seeding throughout the project on disturbed areas that have reached final grade or <br /> that will remain unworked for more than 30 days. <br /> The optimum seeding windows for western Washington are April 1 through June 30 and <br /> September 1 through October 1. <br /> Between July 1 and August 30 seeding requires irrigation until 75 percent grass cover is <br /> established. <br /> Between October 1 and March 30 seeding requires a cover of mulch with straw or an <br /> erosion control blanket until 75 percent grass cover is established. <br /> Review all disturbed areas in late August to early September and complete all seeding <br /> by the end of September. Otherwise, vegetation will not establish itself enough to <br /> provide more than average protection. <br /> . Mulch is required at all times for seeding because it protects seeds from heat, mois- <br /> ture loss, and transport due to runoff. Mulch can be applied on top of the seed or <br /> simultaneously by hydroseeding. See BMP C121: Mulching (p.284)for spe- <br /> cifications. <br /> . Seed and mulch, all disturbed areas not otherwise vegetated at final site sta- <br /> bilization. Final stabilization means the completion of all soil disturbing activities at <br /> the site and the establishment of a permanent vegetative cover, or equivalent per- <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume ll-Chapter 4 -Page 278 <br />