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Stanfiec CITY OF ELK RIVER -STORM WATER UTILITY STORM WATER UTILITY June 25, 2012 3.3 NEW MS4 REQUIREMENTS The MPCA has issued a revised MS4 permit that is currently out for public comment (started May 21, 2012). The public comment period ends July 23, 2012. The new MS4 permit will be effective September 2012. The revised rules will put addition requirements and strain on the Storm Water Utility budget to comply with the minimum control measures. Below are a few of the proposed revisions that will be included in the MS4 rules. The City will be required to develop and implement a program to address Total Maximum Daily Loads (TMDLs) with applicable Waste Load Allocation (WLA) requirements. This means implementing programs and projects to reduce pollutant loadings to selected impaired waters. The City will be required to update mapping of all storm pipes 12 inches or greater in diameter, including storm water flow direction in those pipes. Outfalls to receiving waters (a total of 556 in Elk River) will need to be assigned a unique identification number with an associated geographic coordinate. This task alone will put undue strain on staff time and may need to be contract work. At least three high priority storm water-related issues will need to be emphasized for education and outreach, such as TMDL targets, changing business practices, promoting adoption of residential Best Management Practices (BMPs), or lake improvements through lake associations. The City will be required to develop and implement aPost-Construction Storm Water Management program that requires the use of any BMPs with highest preference given to green infrastructure techniques and practices such as infiltration, evapotranspiration, reuse/harvesting, conservation design, urban forestry, and green roofs. The City will need to enforce no net increase from pre-project conditions for storm water runoff volumes, total suspended solids (TSS), and total phosphorus (TP) on new development projects. Redevelopment projects will be required to show a net reduction for these same parameters. The City will be required to develop a pond assessment schedule and procedures. The assessment process will need to include schedules and procedures for determining the TSS and TP treatment effectiveness for all City-owned ponds. The City will be required to determine the watershed area, percentage of impervious cover, permanent storage volume, and temporary water quality storage volume for each City-owned pond (a total of 110). The above requirements are just a short sampling of the new requirements in the draft MS4 permit. A more complete list of requirements based on the draft MS4 permit is shown in ©ne Team.lnfinote Sa~utions. Project No. 193802143 3.7