7500 HARDESON RD 2021-06-09 - Laserfiche WebLink

i • An interceptor dike with gravel outlet and silt fence shall surround all , topsoil. . Within 2 days complete erosion control seeding, or covering stockpiles ' with clear plastic, or other mulching materials. . Between May 1 and September 30: N . An interceptor dike with gravel outlet and silt fence shall surround all topsoil if the stockpile will remain in place fora longer period of time than active construction grading. • Within 7 days complete erosion control seeding, or covering stockpiles with clear plastic, or other mulching materials. . When native topsoil is to be stockpiled and reused the following should apply to ensure that the mycorrhizal bacterial, earthworms, and other beneficial organisms will not be destroyed: 1. Re-install topsoil within 4 to 6 weeks. 1 2. Do not allow the saturation of topsoil with water. 3. Do not use plastic covering. Maintenance Standards . Inspect stockpiles regularly, especially after large storm events. Stabilize any areas that have eroded. . Establish soil quality and depth toward the end of construction and once estab- lished, protect from compaction, such as from large machinery use, and from erosion. . Plant and mulch soil after installation. . Leave plant debris or its equivalent on the soil surface to replenish organic matter. I . Reduce and adjust, where possible, the use of irrigation, fertilizers, herbicides and pesticides, rather than continuing to implement formerly established practices. 1 BMP 126: Polyacrylamide (PAM) for Soil Erosion Protection ' Purpose Polyacrylamide (PAM) is used on construction sites to prevent soil erosion. Applying PAM to bare soil in advance of a rain event significantly reduces erosion and 1 controls sediment in two ways. First, PAM increases the soil's available pore volume, 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4 -Page 300 '