Laserfiche WebLink
M <br /> January 13,2016 <br /> Project No. T-7342 <br /> Prevention <br /> • Limit site clearing and grading activities to the relatively dry months(typically May through September). <br /> • Limit disturbance to areas where construction is imminent. <br /> • Locate temporary stockpiles of excavated soils no closer than ten feet from the crest of the slope. <br /> • Provide temporary cover for cut slopes and soil stockpiles during periods of inactivity. Temporary cover <br /> may consist of durable plastic sheeting that is securely anchored to the ground surface or straw mulch. <br /> • Establish permanent cover over exposed areas that will not be disturbed for a period of 30 days or more <br /> by seeding, in conjunction with a mulch cover or appropriate hydroseeding. <br /> Containment <br /> • Install a silt fence along site margins and downslope of areas that will be disturbed. The silt fence should <br /> be in place before clearing and grading is initiated. <br /> • Intercept surface water flow and route the flow away from the slope to a stabilized discharge point. <br /> Surface water must not discharge at the top or onto the face of the steep slope. <br /> • Provide on-site sediment retention for collected runoff. <br /> The contractor should perform daily review and maintenance of all erosion and sedimentation control measures <br /> at the site. <br /> 4.2 Landslide Hazard Areas <br /> Section 37.080.A.1 of the EMC defines landslide hazard areas as: <br /> "a. Those areas defined as high and very high/severe risk of landslide hazard in the Dames and Moore <br /> Methodology for the Inventory, Classification and Designation of Geologically Hazardous Areas, <br /> City of Everett,Washington: July 1, 1991: <br /> i. Very high/severe: slopes greater than 15 percent in the Qtb, Qw, and Qls geologic units and <br /> slopes greater than 15 percent with uncontrolled fill. <br /> ii. High: slopes greater than 40 percent in all other geologic units(not Qtb,Qw,and Qls or <br /> uncontrolled fill). <br /> b. Those areas defined as medium risk of landslide hazard in the Dames and Moore Methodology for <br /> Inventory, Classification and Designation of Geologically Hazardous Areas, City of Everett, <br /> Washington: July 1, 1991, when combined with springs or seeps, immature vegetation, and/or no <br /> vegetation: <br /> i. Slopes less than 15 percent for Qtb,Qw,and Qls geologic units and uncontrolled fill. <br /> ii. Slopes of 25 to 40 percent in all other geologic units. <br /> Page No. 5 <br />