The permit requirements for Long-Term Stormwater Management in New Development and Redevelopment for Stormwater Minimum Control Measure 5 (MCM 5) are defined in Section 4.2.5-4.2.5.5 of the Jordan Valley Municipalities (MS4) Permit; No. UTS000001

MCM5 Regulation Summary
Minimum Control Measure 5 regulates permanent private and public flood and water quality control system infrastructure.   The regulation requires new development and redevelopment's flood and water quality infrastructure to reduce pollution, include adequate operations and maintenance procedures, training and facilitate a reporting structure documenting and identifying successful containment of pollution generated on the property.  See Table A for joining MCM5 sections to SWMP Programs


Programs
5.1 Stormwater Ordinance (Land Development)
5.2 Riverton City Standards Specifications and Plans
5.3 Long-Term Stormwater Management Plan and Agreement
5.4 Stormwater Easement
5.5 Storm Drain Fee


5.1: Stormwater Ordinances (Land Development)
Year Executed: 2010
Program Regulation and Summary:
4.2.5.1, 4.2.5.2, 4.2.5.2.1, 4.2.5.2.2, 4.2.5.2.3
Through an ordinance, or other regulatory mechanism, require long-term stormwater controls and enforcement for new development/redevelopment.
Target Pollutants:
Trash, debris, nutrients, pesticides & herbicides, bacteria & viruses, automotive petrochemicals, detergents, cleaning agents and sediment.    Other pollutants common with commercial, private communities, institutions and public infrastructure.
Audience:
Developers, Engineers, Architects, Planners and City Staff
Description:
The ordinances listed below are current and were adopted to facilitate the MS4 regulations for all 6 MCM’s.
Primary ordinances passed to satisfy MS4 regulation include:
13.20 Riverton City Stormwater Ordinance 
13.25 Riverton City Stormwater Utility Ordinance 
The following ordinances also support MS4 regulation but were passed independent of MS4 regulation include:
15 Buildings and Construction
17 Subdivision
18 Land Use and Development
18.115 Geologic Hazards
18.115 Groundwater Protection Overlay Zone
Measure of Success:
Annually identify failures related to insufficient or absent development ordinance.   
Responsible Staff:
Public Works Director, City Engineer, Planning Director, Flood Control Engineer
Funding:
Storm Drain Fee, General Fund
Appendix:
Conclusions
2021-2022
No problems identified with development related ordinance regarding water quality.  There were DEQ suggested changes identified in 2014 but programs are functioning regardless of this ordinance deficiency.

 
5.2: Riverton City Standards Specifications and Plans
Year Executed: 2011
Program Regulation and Summary:
4.2.1.3, 4.2.1.4, 4.2.4.3.1, 4.2.4.3.3, 4.2.5.1, 4.2.5.1.1, 4.2.5.1.2, 4.2.5.1.3, 4.2.5.1.4, 4.2.5.1.5,4.2.5.2.4,4.2.5.2.5, 4.2.5.3,4.2.5.3.1,4.2.5.3.2, 4.2.5.5
Provide development design requirements for property owners design and maintenance agents, including and not limited to requirements for, flood and water quality control, retention regulation, encouraging LID options (5 options minimum), maintenance and operations requirements, agreements governing maintenance and inspection documentation.
Target Pollutants:
Trash, debris, nutrients, pesticides & herbicides, bacteria & viruses, automotive petrochemicals, detergents, cleaning agents and sediment. Other pollutants common with commercial, private communities, institutions and public infrastructure.
Audience:
Developers, Engineers, Architects and City Staff
Description:
The Standards Specifications and Plans Manual references UTS00001 and includes development design specifications for appurtenant MCM 5 requirements and SWMP Programs.  
Some SWMP program templates, forms and supporting instruction for MCM 4 and 5 program's not practical for the Standard Manual document are provided by reference on the City webpage. 
The Standards Specifications and Plans Manual includes UPDES design standards for, including but not limited to:
1. Flood and water quality system specifications and details.
2. Education for water quality design for developers, engineers and architects. 
3. Long-Term Stormwater Management 
4. Retention regulation 
5. Low Impact Development encouragement 
6. Water quality systems and long-term stormwater management systems review process checks.
Measure of Success:
Annually evaluate the effectiveness of UPDES programs and City Developoment Standards.  Make conclusions and recommendations to City.
Responsible Staff:
Public Works Director, City Engineer, Planning Director, Flood Control Engineer
Funding:
Storm Drain Fee, General Fund
Program Documents:
UPDES LID Design Standards
2021-2022
City standards are currently under review.  Throughout, the majority of the report period City development review staff was not in consensus for managing the regulation retention requirement, low impact development (LID) and long-term stormwater management for private and public infrastructure.  Consequently, one property subject to regulation retention did not conform to the retention standard. 
A process for encouraging LID and providing detail options for managing retention regulation is not functional.  Private development is allowed to consider maintainable LID selections provided by the State "A Guide to Low Impact Development within Utah" but not public infrastructure.  There are 5 LID options for managing retention regulation in draft but they are not adopted. 
Long-term Stormwater Management Plan Program review was separated from flood control requirements with development review.  For best success, long-term stormwater management water quality control systems should be reviewed with developments flood control systems at the development design stage.  However, the City has included LTSWMP review with development flood control review for the current 2022-2023 report period.   

5.3: Long-Term Stormwater Management Plan and Agreement
Year Executed: 2011
Program Regulation and Summary:
4.2.1.3, 4.2.1.4, 4.2.4.3.1, 4.2.5.1, 4.2.5.2.2, 4.2.5.2.3, 4.2.5.2.4,4.2.5.4.1,4.2.5.4.2, 4.2.5.2.5, 4.2.5.3, 4.2.5.3.1, 4.2.5.3.2 4.2.5.4, 4.2.5.4.1, 4.2.5.4.2
Provide long-term stormwater system design requirements, maintenance instruction and education for property owners and design and maintenance agents, including and not limited to requirements for, retention regulation, LID infrastructure details, maintenance and operations plans, maintenance agreements, inspection and maintenance documentation, and enforcement mechanisms.  
Target Pollutants:
Trash, debris, nutrients, pesticides & herbicides, bacteria & viruses, automotive petrochemicals, detergents, cleaning agents and sediment. Other pollutants common with commercial, industrial, private communities, institutions and public infrastructure.
Audience:
Developers, Engineers, Architects, Planners and City Staff
Description:
The program consists of implementing the Utah Stormwater Advisory Committees Long-Term Stormwater Management Plan Template and an Agreement (USWAC LTSWMP).  The USWAC LTSWMP is amended for Riverton City's local development standards and hydrologic conditions.  The "Agreement" establishes the developments responsibility to UPDES Long-Term Stormwater Management Regulations and the Plan describes the flood and water quality system and maintenance requirements including, system limitations, system performance details, and a means for inspection and maintenance documentation.  Program necessitates cooperation with the City Planning and Economic Development and Engineering Department because it is necessary that water quality infrastructure is designed with the flood control system during the development process. In addition, to UPDES requirements, the LTSWMP program aids with managing and enforcing the preservation of long-term flood control systems.
Measure of Success:
Annually evaluate Long-Term Stormwater Management Plan implementation and inspection reports and conclude and summarize effectiveness.
Responsible Staff:
City Engineer, Flood Control Engineer
Funding:
Storm Drain Fee, General Fund
Program Documents:
Appendix:
Conclusion:
2021-2022
The City successfully obtains detailed Long-Term Stormwater Management Plans and Agreements from all development.  The program is working however owner maintenance obligation oversight is inadequate.  A fulltime employee dedicated to program oversight is necessary for adequate implementation of the entire program.  Many cities across the State are recognizing adequate long-term stormwater management oversight necessitates dedicating a fulltime employee.  UPDES staff anticipates a Long-Term Stormwater Management inspector could also assist the Land Disturbance Program inspector's inspection short fall with Program 4.2 Land Disturbance permit and municipal monthly visual inspections, semi-annual comprehensive inspections and annual visual observation of stormwater discharges.  


5.4: Stormwater Easement
Year Executed: 2003
Program Regulation and Summary:
4.2.5.2, 4.2.5.2.1, 4.2.5.2.3, 4.2.5.4, 4.2.5.4.1, 4.2.5.4.2
Provide legal means for flood and water quality control system access, inspection, maintenance, preservation and enforcement. 
Target Pollutants:
Trash, debris, nutrients, pesticides & herbicides, bacteria & viruses, automotive petrochemicals, detergents, cleaning agents and sediment. Other pollutants common with small private communities.
Audience:
Developers, Engineers, Architects, Planners and City Staff
Description:
Program is implemented through a traditional standard easement template document.  The stormwater easement facilitates a description, legal access, preservation, maintenance and restoration of flood and water quality control systems.  The easement is necessary when public systems drain to private property.  The Stormwater Easement and Long-Term Stormwater Management Programs are complimentary to each other.   
Measure of Success:
Successful long-term preservation of flood and water quality control systems are the measure of success.  
Responsible Staff:
City Engineer, Flood Control Engineer
Funding:
Storm Drain Fee, General Fund
Program Documents:
Conclusion:
2021-2022
No problems occurred warranting updates to this program.  This program continues as a valuable tool for managing flood and water quality control infrastructure.   It complements the Long-Term Stormwater Management Agreement for providing legal means for enforcing, protecting, preserving and maintaining permanent private flood and water quality infrastructure. 

 5.5: Storm Drain Fee
Year Executed: 2011
Program Regulation and Summary:
4.1.2.2
Secure the necessary resources to meet all the requirements of the permit.
Audience:
Commercial, industrial, institutional, multifamily, and single-family home resident property owners, and staff
Description:
The Storm Drain Fee is a user fee that accounts for a properties long-term use of public flood and water quality control infrastructure and environmental pollution impact.  The long-term impact calculations are a function of a properties impervious surface area, runoff volume, roadway use, and the site-specific pollution impact.   In other words, each property's fee is calculated by the runoff retained and detained relative to 100 year 24hour storm event volumes discharged to publicly maintained roadway systems, the daily traffic to and from the property and the pollution risk reaching public drainage infrastructure and State and City regulated surface and subsurface water resources.   This program is intended achieve UPDES Storm Drain Fee equality and encourage and reward properties choosing to invest in better flood and water quality system infrastructure.  The fee is intended to fund UPDES programs required by the MS4 Permit as shown with Riverton City's Stormwater Management Plan (SWMP).  
Measure of Success:
The program is successful when the Storm Drain Fee adequately funds necessary SWMP programs. 
Responsible Staff:
City Engineer, Flood Control Engineer
Funding:
Storm Drain Fee, General Fund
Conclusion:
2021-2022
In addition to UPDES funding the fee used is a means to encourage better Low Impact Development design approaches.  Not many developments choose used the incentive, but the program is available for interested property owners.
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