Laserfiche WebLink
1 <br /> Preliminary Stormwater Site Plan Everett, WA <br /> Off-Site Analysis <br /> Downstream Analysis <br /> See the Storm Drainage Analysis of Existing Kenilworth Hills #1 Pond Basin in the "Special <br /> Reports and Studies" section of this report for downstream analysis. <br /> IUpstream Analysis <br /> Runoff from the west is intercepted by 36`h Ave W. Runoff from approximately 10 acres to <br /> the south between the site and Seaway Blvd. will enter the site. This area has been <br /> accounted for in the drainage design. <br /> ' Analysis and Design of Required Erosion and Sediment Control BMPs <br /> Y g q <br /> All erosion and sediment control measures shall be governed by the requirements of the <br /> Everett Stormwater Management Manual. A detailed temporary erosion and sedimentation <br /> control plan will be prepared to assist the contractor in complying with these requirements <br /> during building permit application. The proposed TESC plan will utilize interceptor swales, <br /> silt fence, inlet protection and sediment ponds, as necessary. <br /> A. Construction Sequence and Procedure <br /> The proposed development will include an erosion/sedimentation control plan designed to <br /> prevent sediment-laden run-off from leaving the site during construction. The erosion <br /> potential of the site is influenced by four major factors: soil characteristics, vegetative <br /> cover, topography, and climate. Erosion/sedimentation control is achieved by a <br /> combination of structural measures, cover measures, and construction practices that are <br /> tailored to fit the specific site. <br /> rPrior to the start of any grading activity upon the site, all erosion control measures, <br /> including installation of a stabilized construction entrance, shall be installed in accordance <br /> with this plan and the construction documents. <br /> The best construction practice will be employed to properly clear and grade the site and to <br /> schedule construction activities. The planned construction sequence for the construction <br /> of the site will be provided during the construction document approval process. <br /> B. Soil Stabilization and Sediment Trapping <br /> Structural control measures will be used to reduce erosion and retain sediment on the <br /> construction site. The control measures will be selected to fit the specific site and seasonal <br /> ' conditions. For instance, the soils on the site will significantly affect the erosion potential. <br /> On-site soils are Alderwood Gravelly Sandy Loam and Alderwood-Everett Gravelly Sandy <br /> Loam, described as having slight erosion potential. The general site area is moderately <br /> I <br /> PACLAND Job# 50175001 Page 5 <br />