(A) In order to minimize the danger of slides onto or from adjacent lands, the Superintendent of Streets may specify in the permit the permissible angle of slope of the sides of the excavation or fill. No side of the excavation or fill may be made steeper at any point than the angle so specified in the permit, unless supported by a substantial, permanent retaining wall of sufficient strength to permanently support the sides of the excavation or fill and constructed in accordance with a permit to do so, as provided in this chapter.
(B) The retaining wall shall be of concrete, brick, stone or other material, not subject to rapid deterioration, and shall extend the full height and length of each side of the excavation or fill which is at any point made steeper in slope than the angle specified in the permit to excavate or fill.
(C) (1) If the applicant desires to make any side of the excavation or fill steeper than the angle specified in the permit, he or she shall so state in a supplemental application, and shall file therewith, in duplicate, detailed plans and specifications for the retaining wall.
(2) One copy of the plans and specifications shall be forthwith delivered to the Building Inspector, who shall examine the same and shall promptly report to the Superintendent of Streets whether the retaining wall, if built according to the plans and specifications, will satisfy the requirements of the Building Code of the town and the requirements of this section.
(D) Upon the approval of the plans and specifications by the Building Inspector and the issuance of a building permit therefor, the Superintendent of Streets shall include in the permit to excavate or fill, or in a supplemental permit to excavate or fill, a provision allowing the sides of the excavation or fill to be made steeper than the angle of slope specified therein, if supported by a retaining wall constructed according to the plans and specifications.
(Prior Code, § 12.20.130)