Agenda - Council - 06/11/2024 - Laserfiche WebLink

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5. 14. CC Regular Session Meeting Date: 06/ 11 /2024 Primary Strategic Plan Initiative: Promote economic growth and development. Information Title Adopt Resolution #24-153 Ordering Plans and Specifications for Improvement Project #25-01, Rivers Bend Regional Stormwater Improvements Purpose/Background: Purpose: The purpose of this case is to adopt Resolution #24-153 ordering plans and specifications for Improvement Project #25-01, Rivers Bend Regional Stormwater Improvements. Background: In June of 2016, the Anoka Conservation District completed a Stormwater Retrofit Analysis for the City of Ramsey and the Lower Rum River Watershed Management Organization (LRRWMO) to identify and rank potential improvement projects that drain to the Mississippi and Rum Rivers. The Stormwater Retrofit Analysis recommended modifying a wetland within Rivers Bend Park to increase the volume of stormwater runoff storage provided by this wetland that currently treats runoff from a 38-acre catchment area for the purpose of reducing sediment and phosphorus loads that can end up in the receiving water, which is an oxbow of the Rum River. See Project ID: RR8-A on page 89 of the attached modified version of the Stormwater Retrofit Analysis for reference. When the Lightbridge Academy commercial development application was received last Fall, staff began working with the developer to address their stormwater management requirements. This development is located within the City of Ramsey's East Drinking Water Supply Management Area (DWSMA) where infiltration of stormwater is prohibited so staff reached out to the Lower Rum River Watershed Management Organization (LRRWMO) to confirm that the developer could purchase credits to utilize a portion of The COR regional infiltration basin to comply with the LRRWMO's volume retention requirements. At the time The COR regional infiltration basin was constructed it was believed that the basin could be used to accommodate development within the East DWSMA. However, the LRRWMO's engineer, BARB Engineering, informed City staff that since the two DWSMA's drain to different water bodies (the East DWSMA drains to the Rum River and the West (The COR) DWSMA drains to the Mississippi River) so Lightbridge Academy is unable to pay a fee to use The COR infiltration basin. Discussions then turned to what Lightbridge needed to do to comply with LRRWMO requirements for stormwater runoff rate control and water quality improvements. The developer's engineer stated they cannot provide these improvements on their site so they asked if the City could accommodate these requirements. After discussions with the LRRWMO's engineer it was determined that the City needed to construct stormwater management facility improvements on the west edge of the Rivers Bend Park, West of the existing wetland that currently treats all stormwater runoff from the 3 8-acre catchment as addressed in the ACD's Stormwater Retrofit Analysis, and that the existing wetland should not be impacted. Bolton & Menk was therefore hired to perform a wetland delineation to identify the limits of the existing wetland to avoid impacts. This report was recently completed and is being submitted to the LRRWMO for concurrence and approval at a future WMO meeting. A copy of the report is attached for reference. City staff also requested Bolton & Menk to submit a professional services proposal for designing and preparing final construction plans for the proposed Rivers Bend Regional Stormwater Improvements project to treat