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PENSKE TRUCK LEASING EVERETT ONSITE IMPROVEMENTS <br />CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN <br />Sitts & Hill Engineers, Inc. <br />Job Number 17,710 <br />• An interceptor dike with gravel outlet and silt fence shall surround all <br />topsoil. <br />• Within 2 days complete erosion control seeding, or covering stockpiles <br />with clear plastic, or other mulching materials. <br />• Between May 1 and September 30: <br />. An interceptor dike with gravel outlet and silt fence shall surround all <br />topsoil if the stockpile will remain in place for a longer period of time <br />than active construction grading. <br />. Within 7 days complete erosion control seeding, or covering stockpiles <br />with clear plastic, or other mulching materials. <br />. When native topsoil is to be stockpiled and reused the following should apply to <br />ensure that the mycorrhizal bacterial, earthworms, and other beneficial organisms <br />will not be destroyed: <br />1. Re4nstall topsoil within 4 to 6 weeks. <br />2. Do not allow the saturation of topsoil with water. <br />3. Do not use plastic covering. <br />Maintenance Standards <br />• Inspect stockpiles regularly, especially after large storm events. Stabilize any <br />areas that have eroded. <br />• Establish soil quality and depth toward the end of construction and once estab- <br />lished, protect from compaction, such as from large machinery use, and from <br />erosion. <br />• Plant and mulch soil after installation. <br />• Leave plant debris or its equivalent on the soil surface to replenish organic matter. <br />• Reduce and adjust, where possible, the use of irrigation, fertilizers, herbicides and <br />pesticides, rather than continuing to implement formerly established practices. <br />P C12S: Polyacrylamide (PAM) for Soil Erosion <br />Protec <br />' Purpose <br />Polyacrylamide (PAM) is used on cons to prevent soil erosion. <br />Applying PAM to bare ance of a rain event sign reduces erosion and <br />controls sedi o ways. First, PAM increases the soil's availa volume, <br />2014 Stormwater Management Manua! for Western Washington <br />Volume 9 - Chapter 4 - Page 300 <br />SITTS & HILL ENGINEERS, INC. 44 <br />TACOMA, WASHINGTON <br />