1304 80TH ST SW EVERETT SCHOOL DISTRICT 2018-01-02 MF Import

L 2. Prior to issuance of grading permits for removing earth from a site, the applicant must demonstrate that permits have been obtained for placement of the earth off-site. (SEPA Earth and Water Policies) 3. All soil piles shall be covered with plasti- sheeting or other impervious covering staked to the ground or anchored with rocks or sandbags. Berms, earthen or otherwise, must he constructed at the perimeter of excavated areas to prevent adjacent site runoff from entering the excavations. (SEPA Earth and Water Policies) 4. Temporary slopes within native glacial soils shall be limited to a maximum angle of 1/2 fool horizontal (H) to 1 foot vertical (V). Temporary slopes within fill soils shall be limited to a maximum angle of 1H:1V. Temporary slopes must be covered with an impermeable membrane, such as visqueen or mulch, in order to prevent precipitation from coming in contact with the soils. (SEPA Earth and Water Policies) Permanent slopes steeper than 25% shall be designed by a professional civil or geotechnical engineer. The design should present appropriate erosion control measures which may include: hydroseeding, erosion control blankets, rip-rap, jute matting, and visqueen. (SEPA Earth and Water Policies) 5. Grading/filling must not adversely affect the hydrology of streams and existing or created wetlands. (SEPA Earth and Water Policies) 6. Grading/filling on-site shall not adversely affect adjoining sites. (SEPA Earth and Water Policies) 7. Clearing limits shall be staked, flagged, and/or fenced off prior to initiation of any clearing or land alteration activities as approved by the Engineering and Public Services Inspector. Section 4: SURFACE/GROUNDWATER, PLANTS AND ANIMALS 4.3.1 General Mitigation Measures 1. The following Best Management Practices (BMPs) must be followed for all construction work through and immediately adjacent to environmentally sensitive areas and their buffers, unless otherwise required by a permit issued by a federal or state agency. • Work should be done in the dry season whenever possible (June 15 to September 15). • The width of the corridor through the wetland or stream should be minimized. • Construction staging areas must be located outside of environmentally sensitive areas and their buffers, unless determined by the Planning Director to be infeasible. Streams, wetlands, buffers, staging areas and construction limits shall be clearly shown on construction plans. Construction limits shall be clearly marked in the field with orange construction fencing. • Work shall be done so as to minimize turbidity, erosion, and other water quality impacts.