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(1) Before performing any land disturbing activity subject to a land disturbing activity permit, the applicant shall mark on the site and show on the land disturbing activity site plan the limits of all proposed land disturbing activities, trees and native vegetation to be retained, and drainage courses so that setbacks can be determined. Cut and fill slopes shall be set back from site boundaries in accordance with this section. Setback dimensions shall be horizontal distances measured perpendicular to the site boundary.

(2) The top of cut slopes shall not be nearer to a site boundary line than 20 percent of the vertical height of the cut slope. The setback shall be increased when necessary to stabilize any required subsurface drainage or surcharge, as determined by the geotechnical engineering report, soils engineering report, or engineering geology report pursuant to SCC 30.63B.220 through 30.63B.240.

(3) The toe of fill slopes shall not be made nearer to the site boundary line than 50 percent of the vertical height of the fill slope.

(4) For any proposed cut, fill, rockery, or retaining wall within six inches of a site boundary line, a survey by a land surveyor licensed in Washington State shall be completed that ensures compliance with construction and land disturbing activity site plans prior to construction in the affected area.

(5) The grades and cuts and fills established on the land disturbing activity plan shall be prepared based on topographic data obtained to comply with SCC 30.63A.400 and volume I of the Drainage Manual. (Added by Amended Ord. 10-023, June 9, 2010, Eff date Sept. 30, 2010; Amended by Amended Ord. 12-018, May 2, 2012, Eff date May 21, 2012; Amended by Ord. 15-103, Jan. 11, 2016, Eff date Jan. 22, 2016; Amended by Amended Ord. 18-106, Jan. 16, 2019, Eff date Jan. 27, 2019).