HomeMy WebLinkAboutCouncil Presentation 05-21-2019 Stormwater Management PlanStormwater Management PlanPaula Bluemer, Environmental Project ManagerMay 21, 2019
Regulatory Background1948 – Federal Water Pollution Control Act–First major law that addressed water pollution1972 –Act expanded and reorganized1987 – Amendments were added that required EPA to establish a program that addressed stormwater discharge2002 – States get primacy, implemented in two phases:‐Phase I –Large and Medium sized MS4s‐Phase II –Small MS4s
Municipal Storm Sewer System Program•In 2002 The Town of Marana was designated as a small MS4 because of proximity to the Tucson Urbanized Area–Town of Marana developed their first Stormwater Management Plan in 2003, which was last revised in 2007•Due to significant changes in the latest AZPDES MS4 General Permit, a rewrite of the Town’s SWMP is warranted
Stormwater Management PlanWhat is a SWMP–Program document outlining how the Town of Marana will meet the requirements of the MS4 permit through a stormwater program that includes training, monitoring, reporting, and SWMP evaluation and revision–Required under Section 5.1 of the ADEQ AZPDES General Permit for stormwaterdischarges from Small MS4s to Waters of the United States–Describes the policies and procedures that the Town implements to reduce, to the maximum extent practicable, pollutant discharges and to ensure that any discharges from the MS4 do not cause or contribute to exceedances of surface water quality standards–6 minimum control measures specified in the permit
Public Outreach and Education•Develop brochures for target audiences that have the greatest potential to impact the storm drain system•Have a portion of the Town website dedicated to Stormwater Program•Develop and present a stormwater pollution prevention presentation for school age children
Public Involvement and Participation•Provide access to the SWMP on the Town website•Annually provide the public an opportunity to review and comment on the SWMP•Town staff will participate in local and regional stormwater programs, workshops, and advisory committees
Illicit Discharge Detection and Elimination Program•Prepare and maintain storm sewer map•Have a regulatory mechanism to prohibit non‐stormwater discharges into the storm sewer system•Have a procedure for inspecting mapped outfall points for illicit discharges. Conduct dry weather inspections once per year•Have a procedure for receiving, addressing, and recording illicit discharge reports from the public•Have a procedure for inspecting a minimum of 2 outfalls during rain events 4 times per yearThis image cannot currently be displayed.
Construction Activity Stormwater Runoff Control•Require applicable construction projects to submit a SWPPP for review and acceptance by the Town•Inspect construction projects to ensure compliance with the Town Code
Post-Construction Stormwater Management•Implement an inventory system of all post construction structural stormwater control measures that discharge into the MS4 that are located on Town property•Require a reduction in stormwater runoff when comparing pre and post construction runoff amounts in the areas of the Town designated as critical or balanced basin
Pollution Prevention and Good Housekeeping for Municipal Operations•Train staff on general stormwater pollution prevention procedures•Provide specialized training for staff more likely to affect stormwater quality•Perform regular inspections at Town facilities that have a high potential for pollutant discharge
Changes to the Program•Wet weather monitoring•Santa Cruz River is impaired for Ammonia and E.coli•Analytical monitoring of stormwater discharge required at 2 outfall sites•Water quality data will be used to determine if efforts are reducing pollutants•Increase training for field staff to be able to identify illicit non‐stormwaterdischarges•Increase content of stormwatersection of the Town’s website