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. . . ,. . ::-... " (v) ,Water Pollution. . Excavation operators Shall comply with all. applicabl~ Minnesota Pollution Control Agency and Department of Natural Resources regulations and all applicable United States Environmental Protection Agency regulations. for the protection of water quality. No waste products or processed residue including untreated washwater shall be deposited in any public waters of the State of Minnesota. (vi) Topsoil Preservation. All topsoil shall be retained at the excavation site until completion of rehabilitation work in accordance with the rehabilitation plan. (vii)Slopes During Excavation Operations. During the entire period of operations, all excavations other than the working face, shall be sloped on all sides at a maximum ratio of one foot horizontal to one foot vertical, unless a steeper slope is approved by the City. Where excavations are adjacent to a public roadway or other right- of-way, the excavation shall have a maximum slope of four feet horizontal to one foot vertical. Slopes adjacent to water bodies shall not exceed six feet horizontal to one foot vertical. (viii) Council Waiver. The City Council, at the time of issuance of the excavation license, may waive or modify any of the foregoing provisions in this Section 23.06, or impose additional requirements, if it finds that the plan of operation or other materials submitted with the application or other factors make appropriate more suitable measures for standards consistent with the public health, safety and welfare. (f) Rehabilitation Standards. (i) Rehabilitation shall be a continuing process occurring as quickly as possible after the excavation operation has moved into another part of the excavation site. (ii) Slopes. All banks and slopes shall be rehabilitated in accordance with the rehabilitation plan submitted with the excavation license application. No rehabilitated slope shall be steeper than four (4) feet horizontal to one (1) foot vertical, except that steeper slopes may be permitted in accordance with the rehabilitation plan when said slopes are planned for slope-related uses including, but not limited to, ski hills and sliding hills. (iii) Cover and Planting. Slopes, graded and back filled areas shall be surfaced with at least three (3) inches of topsoil and planted with ground cover sufficient to retain the soi~. Such ground cover shall be tended as necessary until it is self-sustaining. (iv) Slopes to Water Bodies. No slope descending to a water body shall exceed one (1) foot vertical to six (6) feet horizontal. 5.