2016-04-26_PWETC_AgendaPacket - Laserfiche WebLink

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Roseville Public Works, Environment and Transportation Commission Agenda Item Date: April 26, 2016 Item No: 8 Item Description: Storm Water Updates Background: The City applies for a Municipal Separate Storm Sewer Systems (MS4)Permit through the Minnesota Pollution Control Agency (MPGA) to discharge stormwater into local water resources. The permit was updated in 2013, and the City is required to make certain changes to our process for Erosion Control Inspections, Stormwater permitting, and Ordinances to make them align with the MPCA requirements. Staff has updated the provided documents to align with the MPCA permit. Staff also made minor changes to better align with the local watershed districts as it pertains to water quality standards. One example of this is a change from the approved 1.0" of stormwater volume to be treated on site during reconstruction, to 1.1"which is the watershed district standard. This alignment is to provide continuity for applicants who apply for our permits, that are used to working with the watershed districts. This 0.1"increase is also in line with the Minimal Impact Design standards (MIDs). Staff recommends lowering the Erosion Control Permit threshold for work on impervious surface. Staff recommends making the new threshold 5,000 sq-ft, down from 10,000 sq-ft. The lowering is to align our Erosion Control Permit with our Stormwater Management Standards. This will ensure that small sites (ex. Parking lots) are covered by our Erosion Control Permit and the City can inspect it to protect our local water resources. Lastly, Staff recommends adding a Stormwater Impact Fund. This fund would allow residents that apply for a Residential Stormwater Permit(ReSWP) to purchase treatment through a City installed regional system, in lieu of having to provide treatment onsite through rain barrels, raingardens, etc. The purchasing of stormwater treatment will be an added option for residents. This fund would also allow developers that are unable to treat stormwater onsite, to purchase treatment credits based on a$/Cu-ft rate. Currently the City doesn't have a policy in place to properly address areas that cannot meet the City's Stormwater Management Standards whether it is due to site constraints, contaminated soil, no available storm sewer, etc. Recommended Action: Receive a presentation on the updated materials,provide comments, and recommend approval to the City Council.