Sammamish Unified Development Code

Environment & Sustainability | Clearing and Grading

such as concrete slabs, tree stumps, brush, and car bodies.

l. Fencing. Fencing, where required by the director, to protect life, limb, and property, shall be installed with lockable gates that must be closed and locked when not working the site. The fence must be no less than five feet in height and the fence material shall have no horizontal opening larger than two inches. m. Setbacks. The tops and the toes of cut and fill slopes shall be set back from property boundaries as far as necessary for safety of the adjacent properties and to prevent damage resulting from water runoff or erosion of the slopes. The tops and the toes of cut and fill slopes shall be set back from structures as far as is necessary for adequacy of foundation support and to prevent damage as a result of water runoff or erosion of the slopes.

f. Fill Material. Except in an approved sanitary landfill, only earth materials that have no rock or similar irreducible material with a maximum dimension greater than 18 inches shall be used.

g. Drainage. Provisions shall be made to:

1) Prevent any surface water or seepage from damaging the cut face of any excavations or the sloping face of a fill; i. Carry any surface waters that are or might be concentrated as a result of a fill or excavation to a natural watercourse, or by other means approved by the City engineer. h. Bench/Terrace. Benches, if required, at least 10 feet in width shall be back-sloped and shall be established at not more than 25 feet vertical intervals to control surface drainage and debris. Swales or ditches on benches shall have a maximum gradient of five percent. i. Access Roads – Maintenance. Access roads to grading sites shall be maintained and located to the satisfaction of the City engineer to minimize problems of dust, mud, and traffic circulation. j. Access Roads – Gate. Access roads to grading sites shall be controlled by a gate when required by the director. k. Warning Signs. Signs warning of hazardous conditions, if such exist, shall be affixed at locations as required by the director.

Slopes and setbacks shall be determined by the director.

n. Excavations to Water-Producing Depth. All excavations must either be made to a water-producing depth or grade to permit natural drainage. The excavations made to a water-producing depth shall be reclaimed in the following manner: i. The depth of the excavations must not be less than two feet measured below the low water mark. ii. All banks shall be sloped to the water line no steeper than three feet horizontal to one foot vertical. iii. All banks shall be sloped from the low-water line into the pond or lake with a minimum slope of three

186 | Title 21: Sammamish Development Code

Effective | January 1, 2022

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