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Proposed View Ridge Subsurface Exploration, Geologic Hazards, Infiltration Potential, <br /> Elementary School Replacement and Preliminary Geotechnical Engineering Report <br /> Everett, Washington Geologic Hazards and Mitigations <br /> storm water conveyance channels through work areas to route runoff to the approved <br /> treatment facilities. <br /> 4. All disturbed areas should be revegetated as soon as possible. If it is outside of the <br /> growing season, the disturbed areas should be covered with mulch, as recommended in <br /> the erosion control plan. Straw mulch provides the most cost-effective cover measure <br /> and can be made wind-resistant with the application of a tackifier after it is placed. <br /> 5. Surface runoff and discharge should be controlled during and following development. <br /> Uncontrolled discharge may promote erosion and sediment transport. Under <br /> no circumstances should concentrated discharges be allowed to flow over significant <br /> slopes. <br /> 6. Soils that are to be reused around the site should be stored in such a manner as to <br /> reduce erosion from the stockpile. Protective measures may include, but are not <br /> limited to, covering with plastic sheeting, the use of low stockpiles in flat areas, or the <br /> use of straw bales/silt fences around pile perimeters. During the period between <br /> October 1s` and March 31s`, these measures are required. <br /> 7. On-site erosion control inspections and turbidity monitoring should be performed in <br /> accordance with Ecology requirements. Weekly and monthly reporting to Ecology <br /> should be performed on a regularly scheduled basis. TESC monitoring should be part <br /> of the weekly construction team meetings. Temporary and permanent erosion control <br /> and drainage measures should be adjusted and maintained, as necessary, at the time of <br /> construction. <br /> It is our opinion that with the proper implementation of the TESC plans and by field-adjusting <br /> appropriate mitigation elements (best management practices) during construction, as <br /> recommended by the erosion control inspector, the potential adverse impacts from erosion <br /> hazards on the project may be mitigated. <br /> September 22, 2010 ASSOCIATED EARTH SCIENCES, INC. <br /> BWG/tb-KE10025542-Projectsl20100255IKEiWP Page 11 <br />