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1 <br /> t Proposed Virw Ridge Subsnrfuce Fxpfo�ution, Geolagic H2ards, /nfiGratian Potentiul, <br /> Elemenearv Schoo!Repinrement and Prelimirwry Geotechnical Engineering Repon <br /> Evererr, Washingrnn Geologic Hazards and Mirigntions <br /> tstorm water conveyance channels through work areas to route runoff to the approved <br /> treatment facilities. <br /> t4. All dis[urbed areas should be revege[ated as soon as possible. If it is outside of the <br /> growing seaso�, the disturbed areas should be covered with mulc6, as recommended in <br /> ' the crosion control pian. Straw mulch provides the most cost-effective cover measure <br /> and can be made wind-resistant with the application of a tackifier afrer it is placed. <br /> ' S. 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 /> Iimited to, covering with plastic sheeting, the use of (ow stockpiles in flat azeas, or the <br /> , use of straw bales/silt fences around pile perimeters. During the period between <br /> October l�' and March 31", these measures are required. <br /> , 7. On-site erosion control inspections and turhidiry monitoring should be performed in <br /> accordance with Ecology requirements. Weekly and mon[hly reporting [o 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 controt <br /> and drainage measures should be adjusted and maintained, as necessary, at the time of <br /> ' consvuction. <br /> It is our opinion that wilh the proper implementation of the TESC plaus and by field-adjusting <br /> , appropriate mitigation elements (best management practices) during conswction, as <br /> recommended by the erosion control inspector, the potential adverse impacts from erosion <br /> hazards on the project may be mitigated. <br /> 1 i <br /> ' <br /> ' <br /> ' <br /> ' September 22, 2010 ASSOC/ATED EARTH SCIENCES, INC. <br /> BWGirb-XE/P7153A1-Vrojecni201P71551KEIWp Page Il <br /> ' <br />