7400 HARDESON RD 2018-01-02 MF Import

Mining sites must comply with the Department of Natural Resources reclamation requirements. Oti sites with existing mined slopes which are not subject to DNR regulations, slopes must be rernediated to 1.5 horizontal : 1 vertical (I.SH:iV), except for glacial till slopes which can be remediated to 1 H: I V slope if approved by a qualified geotechnical engineer. All remediated slopes must be covered with top soil material that will support vegetaticn, jute matting or equivalent; and be revegetated with hydrosecd, groundcover and shrubs. (SEPA Earth and Water Policies) 8. Temporary slopes within native glacial soils shall be limited to a maximum angle of 1/2 foot horizontal (H) to 1 f�ot vertical (V). Temporary slopes within fill soils shall be limited to a maz_imum angle of 1 H:1 V. Temporary slopes must be covered w•ith an impermeable membrane, such as visqueen or mulch, in order to prevent precipitation &om coming in contact with the soils. (SEPA Earth and Water Policies) Permanent slopes steeper than 25% shall be designed by a professional civil or geoteclmical engineer. The design should present appropriate erosion control measures which may include: hydroseeding, erosion control blankets, rip-rap, jute matting, and visquee:i, (SEPA Earih and �i�ater Policies) 9. Grading/filling must not adversely affect the hydrelogy of streams and existing or created wetlands. (SEPA Earth and Water Policies) 10. Grading/filling on-site shall not adversely affect adjoining sites. (SEPA Earth and Water Pulicies) 11. Clearing limits shall be staked, flagged, and/or fenced off prior to initiation of any cleazing or land alteration activities as approved by the Engineering and Public Services Inspector. Where the clearing limit is the edge of a geologically hazaze��us azea or its buffer, the clearing limit shall be fenced during construction with a chain link or solid wooden fence a minimum of 4 feet high. � � Following completion of construction and prior to issuance of occupancy permits, a permanent fence must be provided along the edge of the buffer. The fence must be split rail or an altemative design approved by the Planning Director. Environmentally sei;sitive azeas signs must be posted on the fence. (SEPA Earth and Water Policies) Section 4: SURFACE/GROUNDWATER, PLANTS AND ANIMALS 4.1 Threshold If a priority species is mapped on or within 300 feet of a site or documented on the site by a qualified individual, additional SEPA review may bc required. This will require coordination with the Department of Fish and Wildlife to determine appropriate mitigation measures. These may include, but are not limited to, seasonal restriction on construction, provision of bufi'ers, and preservation of existing vegetation.