12.35.050 Grading – Approval standards.
Grading permit applications will be approved if the applicant has shown that each of the following criteria which are applicable have been met:
(1) Provisions have been made to maintain adequate flood-carrying capacity of existing watercourses, including future maintenance of that capacity.
(2) No grading will be permitted over an existing public storm drain, sanitary sewer, or water line unless it can be demonstrated to the satisfaction of the City Engineer that the proposed grading will not be detrimental to the anticipated service life, operation and maintenance of the existing utility.
(3) The applicant shall notify the City of Millersburg, any adjacent community, and the Natural Hazards Mitigation Office of the Oregon Department of Land Conservation and Development of any proposed grading activity that will result in alteration or relocation of a watercourse.
(4) All drainage facilities shall be designed to carry waters to the nearest practicable watercourse approved by the designee as a safe place to deposit such waters. Erosion of ground in the area of discharge shall be prevented by installation of nonerosive downdrains or other devices.
(5) Building pads shall have a drainage gradient of two percent toward approved drainage facilities, unless waived by the City Engineer or designee; except the gradient from the building pad may be one percent if all of the following conditions exist throughout the permit area:
(a) No proposed fills are greater than 10 feet in maximum depth.
(b) No proposed finished cut or fill slope faces have a vertical height in excess of 10 feet.
(c) No existing slope faces, which have a slope face steeper than 10 horizontal to one vertical, have a vertical height in excess of 10 feet.
(6) In areas that have an average slope of 12 percent or greater, the following requirements also apply:
(a) Cut slopes shall not exceed a one and one-half (horizontal) to one (vertical) ratio and fill slopes shall not exceed a two (horizontal) to one (vertical) ratio. Slopes which are steeper (e.g., 1.5:1, or 1:1) may be approved by the City Engineer or designee, upon certification by a qualified soils engineer or geologist that the slope will remain stable under foreseeable conditions. The certification must delineate any specific stabilization measures deemed necessary by the soils engineer or geologist. (Ord. 166, passed 12-10-2019)