Environmentally Critical Areas | Environment & Sustainability
monitoring requirements of the construction storm water general permit; 5) A contingency plan incorporated into the temporary erosion and sediment control plan that identifies corrective actions and BMPs that will be implemented if monitoring shows discharge water quality exceeds water quality standards, and that specifies materials to be stockpiled on site for use in an erosion and sediment control response; 6) A seasonal suspension plan for suspending work until the end of the rainy season if temporary erosion and sediment control measures are found to be inadequate; b) Pre-design site inspection by a licensed engineer or geologist to identify erosion hazard areas, no- disturbance areas, other environmentally critical areas, and resources downstream of the site that are to be protected; c) Construction storm water systems and temporary erosion and sediment control best management practices are to be sized for a minimum of a 10-year storm interval; d) The owner must provide a financial guarantee in accordance with Chapter 27A.15 SMC, and in an amount sufficient to cover all costs of implementing the approved temporary erosion and sediment control plan, monitoring site discharges, permanently stabilizing the site,
and restoring any off-site impacts, including materials, labor, and City costs, and include a mechanism allowing the City to use the financial guarantee if the development is stalled or not completed; e) Preparation and implementation of site grading, stabilization, and restoration plans by a licensed engineer, with certification by a geotechnical engineer that these plans are sufficient to prevent erosion and sedimentation of susceptible soils; and f) Preparation of a vegetation management plan by a qualified professional for establishment of permanent vegetation on the site following completion of clearing and grading work. ii. In addition to the requirements of subsection 1.a. of this section, the director may require additional studies of the site hydrology, soils and storm water retention, and may also require grading, structural improvements, erosion control measures, restoration plans, and/or an indemnification/release agreement. iii. Timber harvest may be allowed pursuant to an approved forest practice Type II and III permit issued by the Washington Department of Natural Resources. iv. Construction activity associated with subdivisions, short subdivisions, and similar projects that drain to Lake Sammamish during the wet season shall
Effective | January 1, 2022
Title 21: Sammamish Development Code | 79
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