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Geotechnical Engineering Report 5 January 8,2021 <br /> Glint Car Wash and Sonic Everett,Everett,Washington RGI Project No.2020-643-1 <br /> 5.2 EARTHWORK <br /> RGI expects that site grading will consist of shallow cuts and fills to achieve building and <br /> pavement grades and excavation for utilities including storm, water, sanitary sewer, and <br /> other utilities. <br /> 5.2.1 EROSION AND SEDIMENT CONTROL <br /> Potential sources or causes of erosion and sedimentation depend on construction <br /> methods, slope length and gradient, amount of soil exposed and/or disturbed, soil type, <br /> construction sequencing and weather. The impacts on erosion-prone areas can be <br /> reduced by implementing an erosion and sedimentation control plan. The plan should be <br /> designed in accordance with applicable city and/or county standards. <br /> RGI recommends the following erosion control Best Management Practices (BMPs): <br /> • Scheduling site preparation and grading for the drier summer and early fall <br /> months and undertaking activities that expose soil during periods of little or no <br /> rainfall <br /> > Establishing a quarry spall construction entrance <br /> > Installing siltation control fencing or anchored straw or coir wattles on the <br /> downhill side of work areas <br /> ➢ Covering soil stockpiles with anchored plastic sheeting <br /> > Revegetating or mulching exposed soils with a minimum 3-inch thickness of straw <br /> if surfaces will be left undisturbed for more than one day during wet weather or <br /> one week in dry weather <br /> > Directing runoff away from exposed soils and slopes <br /> ➢ Decreasing runoff velocities with check dams, straw bales or coir wattles <br /> ➢ Confining sediment to the project site <br /> ➢ Inspecting and maintaining erosion and sediment control measures frequently <br /> (The contractor should be aware that inspection and maintenance of erosion <br /> control BMPs is critical toward their satisfactory performance. Repair and/or <br /> replacement of dysfunctional erosion control elements should be anticipated.) <br /> Permanent erosion protection should be provided by reestablishing vegetation using <br /> hydroseeding and/or landscape planting. Until the permanent erosion protection is <br /> established, site monitoring should be performed by qualified personnel to evaluate the <br /> effectiveness of the erosion control measures. Provisions for modifications to the erosion <br /> control system based on monitoring observations should be included in the erosion and <br /> sedimentation control plan. <br /> Corporate Office <br /> 17522 Bothell Way Northeast <br /> Bothell,Washington 98011 <br /> Phone 425.415.0551• Fax 425.415.0311 <br /> Kwi'.rilev-group.corn <br />