Ordinance 2213-97 - Laserfiche WebLink

d. Construction schedule, status update reporting requirements, and contingency provisions to become effective if the schedule is not met. (SEPA Earth and Water Policies) 2. The City shall require submittal of a geotechnical report when facilities are proposed to be located in areas which contain potentially moisture sensitive soils. Moisture sensitive soils may include, but are not limited to, Tokul gravely loam, McKenna gravely silt loam, Teric Medisaprists, and Mukilteo muck. The following minimum mitigation requirements shall be met for all earthwork for facilities on moisture sensitive soils unless otherwise recommended in the geotechnical report: • Limit site disturbance by using tracked equipment, where possible, within the excavation area. • Remove standing water from the excavation area. Outfall water should be filtered or run through a sedimentation basin. • Use surface erosion measures in areas in which surface water is anticipated to drain from the excavation area. Require control measures to be designed by a professional civil or geotechnical engineer, to prevent offsite surface drainage of sediments. Methods may include, but are not limited to, use of silt fences and/or settlement ponds. • Implement a plan to minimize the extent to which these soils become disturbed. Soils which become disturbed, and which are above their optimum moisture content, should either be allowed to dry to within their optimum moisture content and be re-compacted, or be removed from the construction site. (SEPA Earth and Water Policies) 3. Any water quality enhancement or detention facilities proposed near steep slopes will require detailed geotechnical analysis and design that documents and ensures their safety. (SEPA Earth and Water Policies) 4. 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) During Construction/Earthwork 5. All earthwork within a geologically hazardous area or its required buffer must be performed under the supervision of a professional civil or geotechnical engineer. The engineer must provide certification to the City that all work was done in compliance with requirements set forth in the City approved geotechnical report. (SEPA Earth and Water Policies) 6. In order to minimize erosion during construction, all soil piles shall be covered with plastic sheeting or other impervious covering staked to the ground or anchored with rocks or sandbags. Berms, earthen or otherwise, must be constructed at the perimeter of excavated areas to prevent adjacent site runoff from entering the excavations. (SEPA Earth and Water Policies) 7. Mining sites must comply with the Department of Natural Resources reclamation requirements. On sites with existing mined slopes which are not subject to DNR regulations, slopes must be remediated to 1.5 horizontal : 1 vertical (1.5H:1V), except for glacial till slopes which can be remediated to 1H:1V slope if approved by a qualified geotechnical engineer. All remediated slopes must be covered with top soil material that will support vegetation,jute matting or equivalent; and be revegetated with hydroseed, groundcover and shrubs. (SEPA Earth and Water Policies) 15