1004 BROADWAY EVCC STUDENT HOUSING - REPORTS & FINAL DOCUMENTS 2017-01-13

Geotechnical Report - �... . _sed �' Proposed Apartments: 1002, 1006, and 1008 Broadway Street, Everett, Washington May 12, 2015 • During wet weather, the allowable fines content of the structural fill should be reduced to no more than 5 percent by weight based on the portion passing the 0.75-inch sieve, The fines should be non-plastic. • The ground surface within the construction area should be graded to promote run-off of� surface water and to prevent the ponding of water. • Geotextile silt fences should be installed at strategic locations around ihe site to control erosion and the movement of soil. •�xcavation slopes and soils stockpiled on site should be covered witl� plastic sheeting. 6.4 EROSION CONSIDERATIONS Surface runoff can be controlled during construction by careful grading practices. Typically, this includes the construction of shallow, upgrade perimeter ditches or low earthen berms in conjunction with silt fences to collect rtmoff and prevent water from entering excavations or to prevent rtmoff froin the construction area leaving the immediate work site. Temporary erosion control may require the use of hay bales on the downhill side of the project to prevent water from leaving the site and potential storm water detention to trap sand and silt before the water is discharged to a suitable outlet. All collected water should be directed under control to a positive and permanent discharge system. Permanent control of surface water should be incorporated in the final grading design. Adequate surface gradients and drainage systems sliould be incorporated into the design such that surface runoff is collected and directed away from the structure to a suitable outlet. Potential issues associated with erosion may also be reduced by establishing vegetation within disturbed areas immediately following grading operations. 7.0 ADDITIONAL SERVICES To confirm that our recommendations are properly incorporated into the design and construction of khe proposed development, PanGEO should be retained to conduct a review of the final project plans and specifications, and to monitor the construction of geotechnical elements, PanGEO can provide you a cost estimate far construction monitor•ing services at a later date. I�-048 IOOS 13roadway, Rcviscd Pa�TC 15 PanGEO, InC.