New development and redevelopment areas can impact storm water quality because of increased runoff and resulting higher flow velocities. The Long-Term Storm Water Management in New Development and Redevelopment Program addresses post construction storm water runoff to the MS4 from new development and redevelopment construction sites disturbing greater than or equal to one acre, including projects less than one acre that are part of a common plan of development or sale with the intent to control flow and improve water quality by requiring post construction storm water controls to limit the discharge rate to mirror the pre-development hydrology of the previously undeveloped site.
Salt Lake City will address long term post-construction controls in accordance with the Construction Site Storm Water Runoff Control Program through ordinance and other mechanisms including plan review for new development and redevelopment sites, inventory of post construction storm water controls, an incentive program, and an inspection and enforcement program. Structural and non-structural BMPs, and a training program for applicable personnel. Progress towards measurable goals will be detailed in the Annual Report. In addition, Salt Lake City requires all commercial, industrial, and residential developments with impervious areas greater than 15,000 square feet to provide onsite detention facilities to limit the discharge to a pre development rate of 0.2 cubic feet per second per acre (cfs/acre) during the 100 year storm. As an incentive, Salt Lake City offers sites that incorporate BMPs and provide greater onsite retention discounted rates for the storm water impact fee.
Objective: Inspect long-term storm water management measures to ensure adequate long-term operation and maintenance.
Permit Requirement: Part 188.8.131.52.1., 184.108.40.206.2. & 220.127.116.11.3. – Long-term Storm water Management in New Development and Redevelopment
Description: Continue to inspect and enforce post-construction storm water management measures and implement SOPs.
Long-term Storm Water Management Inspections (Permit Requirement 18.104.22.168.): Salt Lake City shall inspect all applicable permanent structural BMPs at least once during installation; and once every five years thereafter. Inspections and records will continue to be documented and maintained. Inspections shall include the following documentation:
BMP 14: Continue an annual review procedure to inspect private drainage detention basins to ensure control structures are in place and functioning properly.
Ordinance Provision for Inspections on Private Property (Permit Requirement 22.214.171.124.1): Title 17, Chapter 17.84.500 – Inspection Right of Entry, grants legal authority to be allowed access to applicable sites during both construction phase and post-construction phase for inspections of long-term storm water BMPs as outlined in the ordinance.
Long-Term Storm Water Management Enforcement (Permit Requirement 126.96.36.199): Title 17, Chapter 17.87, addresses violations in the ordinance to any long-storm water management issues that may adversely affect storm water quality. Enforcement of violations may also include the removal of any storm water impact fee discount the owner/operator may be receiving if they have BMPs that detain or retain storm water.
Inspection and Enforcement SOPs (Permit Requirement 188.8.131.52): Salt Lake City will continue to develop and implement an SOP that details the inspection and enforcement process for LongTerm Storm Water Management.
Objective: Maintain an inventory of post-construction structural storm water control measures.
Permit Requirement: Part 184.108.40.206., 220.127.116.11.1, & 18.104.22.168.2 – Long-term Storm water Management in New Development and Redevelopment
Description: Salt Lake City will continue to maintain an inventory of long-term storm water control measures for applicable new development and redevelopment sites, and will update this inventory as necessary per inspections. The inventory will include the following information: