9001 AIRPORT RD Geotech Report 2018-01-02 MF Import

i S��face F.zplaration. Geologic Haza�d, and I , Preliminn+Y Geo�eciuuca!Engineering Report Sho-►sk Skillr Cente�Additlon Geologic HarEuris and Mitigatioru Everett. Waslui4Bton I' required measures for an azea to be "buttoned-up" will depend on the time of yeas and the duration the azea will be left un-workedshould be mul hed o mco�e ed `w'� P�u e to be IeCt un-worked for more than 2 daY During the summer months, stabilization will usually consist of seal-rolling �e subgrade. Such measU�es W�� a�d in the contractor's ability to get back into a work area after a storm eveat. The stabilization process also includes establishing temporary storm water conveyance �hanue�s th�ough work areas to route runoff to the approved treatment facilities• 4. All disturbed azeas should be revegetated as soon as possible. If it is outside of the growing season, the disturbed ueas should be covered with mulch, as recommended in the erosion control plan. Straw mulch provides the most cost�ffective cover measure and can be made wind-resistant with lhe application of a tackifier after it is placed. 5. Surface runoff and dischazge sho�1Rd ee eros onl and stediment f transP rt aeVUndeeno Uncontrolled discharge may p circumstances should concentrated discharges be allowed to flow over the top of steep slopes. 6. Soils that aze to be reused azound the site should be stored in such a manuer as to reduce erosion from the stockpile. Frotective measures may include, but aze not limited to, covering with plastic sheeting, the use of low stockpiles in flatn d between use of svaw bales/silt fences around pile perimeters. D��g �e Pe October 1" and March 31", these measures ue required• 7. On-site erosion control inspections and turbidity monitoring (if required) should be performed in accordance with the Ecology requirements. WeeklY and monthly reporting co Ecology shouid be performed on a regulazly scheduled basis. TE�� monitoring should be part of the weekly consWction team meetings. Temporary and permanent erosion conuol and drainage measures should be adjusted and maintained, as necessary, at.he tune of conslrucdon. It is our opinion Ghat with che proper implaeme�n��°��c�!oII�r�o�IIaed yei�ederosi n appropriate mitigation elemeots (BMPs) g control inspector, the potential adverse impacts from erosion hazazds on the project may be mitigated. n c�u777 MIENCES INC --_ - AJJV�.�n�u...�..._._ __- lune 11, zIX18 � Page 9 p-.;^d-FF�1713d5-Prole��2f3�EE�WP �__—"'—_ _.