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Item No: 4 Meeting Date: February 6, 2012 Type of Business: Work Session Administrator Review: ____ City of Mounds View Staff Report To: Honorable Mayor and City Council From: Nick DeBar, Public Works Director Item Title/Subject: Review Proposed Ordinance for Illicit Discharge and Connection to Storm Drainage System Background/Discussion: The City’s storm drainage system is comprised of over 30 miles of storm sewer piping, 1,500 catch basins and drainage structures, 10 regional ponds, and other components including infiltration basins, underground storage, etc. This system collects and conveys stormwater runoff until discharging into waterbodies and other natural resources downstream. In order to discharge to these “Waters of the United States”, the City is required to have a National Pollution Discharge Elimination System (NPDES) Storm Water Discharge Permit. Municipalities with storm drainage systems have a subcategory of this permit called a Municipal Separate Storm Sewer System (MS4) general permit. This permit is mandated by the federal regulations under the Clean Water Act and administered locally by the Minnesota Pollution Control Agency. The MS4 permitting program gives owners or operators of municipal separate storm sewer systems approval to discharge stormwater to lakes, rivers, and wetlands in Minnesota. The MS4 permit requires that municipalities develop and implement a Storm Water Pollution Prevention Program (SWPPP). The SWPPP contains seven Minimum Control Measures (MCMs) that are further broken down into Best Management Practices (BMPS). A copy of these MCMs and BMPs is attached for reference. One MCM is “Illicit Discharge and Detection Elimination” (or IDDE) that mandate municipalities to manage non-storm water discharges to the MS4. These discharges contain pollutants that have negative effects on water quality, natural resources, and wildlife. These discharges can be on the surface or underground, and directly or indirectly connected to the storm drainage system. In order to establish responsibility and legal authority to regulate, monitor, respond, and enforce these illegal (or illicit) discharges and connections, the city needs to adopt a new ordinance. Adopting and enforcing this ordinance is also a BMP requirement under the IDDE MCM. Attached for Council review is a proposed new chapter to the municipal code entitled “Illicit Discharge and Connections to the Storm Drainage System”. This chapter will need to be incorporated into the code by ordinance. Respectfully submitted, Nick DeBar - Public Works Director Attachment: • SWPPP Table of Contents • Draft Illicit Discharge and Connections to the Storm Drainage System