9-14-4: STORM WATER FACILITIES DESIGN AND MANAGEMENT STANDARDS:
A. Storm Water Design And Best Management Practices (BMPs): Anyone subject to this chapter must comply with this code, all storm water programs and plans adopted by the city and with the city of St. George “Standard Specifications for Design and Construction.” These standards include specific design criteria and operation and maintenance requirements for each storm water practice. These standards may be updated and expanded from time to time, at the discretion of the city. Storm water facilities that are designed, constructed and maintained in accordance with these standards and with BMP criteria will be presumed to meet the minimum water quality performance standards.
B. Notice Of Intent (NOI) Requirements: All persons grading or disturbing one (1) acre or more, or less than an acre if part of a common plan of development, shall obtain a notice of intent (NOI) through the state of Utah. This form requires that a storm water pollution prevention plan (SWPPP) is developed on a form approved by the city of St. George. This is a binding contract between the state of Utah and the contractor stating that the contractor will address storm water and drainage issues on site and downstream throughout the duration of the project until the notice of termination (NOT) is filed. The NOI and SWPPP shall be signed by both the owner and the operator.
C. Adoption Of The Current UPDES Permit: The SWPPP must be developed and consistent with the most current UPDES storm water general permit for construction activities as described in the State of Utah, Department of Environmental Quality, General Permit for Discharges from Small Municipal Separate Storm Sewer Systems (MS4s).
D. Sediment And Erosion Control Plan Requirements: The sediment and erosion control plan shall apply to construction projects disturbing one (1) acre or more, and to construction projects of less than one (1) acre that are part of a larger common plan of development or sale. The sediment and erosion control plan shall accurately describe the potential for soil erosion and sedimentation problems resulting from land disturbing/grading activity and shall explain and illustrate the measures that are to be taken to control these problems. The length and complexity of the plan is to be commensurate with the size of the project, severity of the site condition, and potential for off-site damage. The erosion and sediment control requirements must be developed and consistent with the most current UPDES storm water general permit for construction activities as described in the State of Utah, Department of Environmental Quality, General Permit for Discharges from Small Municipal Separate Storm Sewer Systems (MS4s) and shall include the following as applicable:
1. Provide and maintain natural buffers and/or equivalent erosion and sediment controls when a water of the state is located within fifty feet (50') of the site’s earth disturbances.
2. Preserve naturally vegetated areas where possible and, if feasible, direct storm water to these areas to maximize storm water infiltration and filtering to reduce pollutant discharges.
3. Install sediment controls along any perimeter areas of the site that will receive pollutant discharges.
4. Minimize sediment track-out.
5. Manage stockpiles.
6. Minimize dust.
7. Minimize steep slope disturbances.
8. Preserve native topsoil.
9. Minimize soil compaction.
10. Protect storm drain inlets.
11. Minimize erosion of storm water conveyance channels and their embankments, outlets, adjacent streambanks, slopes, and downstream waters.
12. Properly design sediment basin or similar impoundments.
13. Proper storage and use of treatment chemicals to minimize potential discharge into storm water conveyance systems.
14. Stabilize exposed portions of the site.
E. Storm Water Pollution Prevention Plan (SWPPP) Requirements: All persons grading or disturbing one (1) acre or more, or less than an acre if part of a common plan of development, shall develop a storm water pollution prevention plan (SWPPP) on a form approved by the city of St. George for the protection, control and restoration of storm water quality. Property owners and operators are responsible to manage storm water runoff and sediment, unless this responsibility is relinquished through the terms and conditions of an easement, agreement, or contract. The storm water pollution prevention plan shall include sufficient information to allow the city of St. George to evaluate the environmental characteristics of the project site, the potential impacts of all proposed development of the site, both present and future, on the water resources, and the effectiveness and acceptability of the measures proposed for managing storm water generated at the project site. To accomplish this goal the storm water pollution prevention plan shall be submitted on a form approved by the city of St. George. The SWPPP shall include a notice of intent (NOI) signed by both the owner and operator. The SWPPP shall be developed consistent with the most current UPDES storm water general permit for construction activities as described in the State of Utah, Department of Environmental Quality, General Permit for Discharges from Small Municipal Separate Storm Sewer Systems (MS4s) and shall include the following:
1. Storm water team.
2. Nature of construction activities.
3. Site map.
4. Non-storm water discharges.
5. Description of storm water controls.
6. Perimeter controls for a “linear construction site.”
7. Sediment track-out controls.
8. Sediment basins.
9. Treatment chemicals.
10. Stabilization measures.
11. Spill prevention response procedures.
12. Waste management procedures.
13. Procedures for inspection, maintenance, and corrective action.
14. Staff training.
15. Compliance with other requirements.
16. SWPPP certification.
17. Post-authorization additions to the SWPPP.
F. Site Inspection Requirements: Site inspections shall comply with most current UPDES storm water general permit for construction activities as described in the State of Utah, Department of Environmental Quality, General Permit for Discharges from Small Municipal Separate Storm Sewer Systems (MS4s) and shall include the following:
1. Inspections shall be performed by a qualified person who by coursework and registration is knowledgeable in the principles and practices of erosion and sediment control and pollution prevention, who possesses the skills to assess conditions that could impact storm water quality and has skills to assess effectiveness of any storm water controls selected and installed to meet the requirements of the post-construction storm water maintenance agreement.
2. If part of a common plan of development, inspections shall be performed at least once every seven (7) days; or
3. If not part of a common plan of development, inspections may be performed at least once every seven (7) days or once every fourteen (14) calendar days and within twenty-four (24) hours of the occurrence of a storm event of one-half inch (0.5") or greater.
4. Access shall be granted to qualified city of St. George personnel on private property as described in the approved SWPPP to inspect the construction storm water BMPs that discharge to the MS4.
G. Notice Of Termination (NOT) Requirements: All persons grading or disturbing one (1) acre or more, or less than an acre if part of a common plan of development, shall file a NOT through the state of Utah after completion of the final project acceptance by the city of St. George. It is the contractor’s responsibility to maintain the storm water and drainage controls until such time as the NOT is filed and accepted by the state of Utah and city of St. George. (Ord. 2015-11-006, 11-19-2015; amd. Ord. 2020-01-003 § 2, 1-9-2020)