A. Rockeries may be used for erosion protection of cut or fill slopes. The primary function of a rockery is to protect the slope face from soil erosion and sloughing.

B. Rockeries used to protect uncontrolled fill slopes may be no higher than four feet, as measured from the bottom of the base rock.

C. Rockeries used to protect cut slopes or reinforced or engineered fill slopes may be up to a maximum height of 12 feet, as measured from the bottom of the base rock, with the approval of the director. Any rockery that is over four feet high, as measured from the bottom of the base rock (cut slopes and reinforced or engineered fill slopes only) shall be designed by a geotechnical engineer.

D. A wall drain must be provided for all rockeries greater than four feet in height as measured from the bottom of the base rock. The drains shall be installed in accordance with the clearing and grading development standards.

E. The procedures and requirements in the clearing and grading development standards related to rockery design and construction must be followed. If the rockery is within a property line setback, see also the height restrictions in LUC 20.20.025, now or as hereafter amended.

F. The geotechnical engineer must provide construction monitoring and/or testing as required by the permit conditions, and submit construction inspection reports to the department for all rockeries that require design by a geotechnical engineer. For each project, or phase of a project, the geotechnical engineer must provide a final letter or report summarizing the results of the construction monitoring and/or testing for each rockery, verifying that the rockery construction meets the geotechnical recommendations and design guidelines. The final letter or report must be submitted to the department prior to the final clearing and grading inspection. (Ord. 6318 § 23, 2016; Ord. 5452 § 10, 2003; Ord. 4754 § 2, 1995.)