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ARDEN HILLS CITY COUNCIL WORK SESSION — AUGUST 15, 2022 2 Public Works Director/City Engineer David Swearingen said there are four or five lakes that are labeled as impaired and Arden Hills has watershed that drains toward them. These are the two that need to be addressed. They need to show progress toward remediation with the MS4 permit. Eventually they will also have to address the other impaired lakes. Ms. Osborn said the scope of the work would be to collect data, do a desktop analysis, field reconnaissance and analysis, and a technical memorandum explaining their findings and recommendations. The permit doesn't require clean up of the lake itself, just the water going into the lake. Discussion ensued regarding what part of the city the storm water was coming from. Mayor Grant stated the work needed to be done and it will help apply for grants. B. CDBG Arden Manor Park Improvements Update HR Green Project Engineer John Morast said the city had applied for a CDBG grant for underserved neighborhoods to replace the play structure, look at drainage and flooding issues, a possible shelter and sport court in Arden Manor. A survey was done and a Rice Creek Watershed District grant was applied for. The grant wasn't awarded but they learned about things that need to happen on the site for stormwater. They reached out to Ramsey County knowing that a lot of the water is coming from the TCAAP site. The thought was to figure out where the groundwater is, what type of contamination is there and what may need to be remediated. The more water that can be held at TCAAP, the less will come to the site and the less they have to contain and/or pass through. Councilmember Holden thought they should talk to Alatus as they are the developer that would do the grading. Ms. Osborn explained the flooding that was currently happening in the park and what they looked at to fix that problem. They felt there isn't enough that can be done on site to mitigate the issue, but Rice Creek Watershed District is willing to help. Mr. Morast said they are waiting on Geotech results, he had received preliminary results of the boring samples. There are no TCAAP contaminates in the groundwater that was sampled. Soils can be reused on site. They can start working on the play structure, ball courts and shade structure as long as they don't increase the impervious surface. Discussion continued regarding the flooding issues on the site. Ms. Osborn said her hope is the Rice Creek Watershed District will fund the study, and explained the analysis process. Councilmember Holmes explained what had been done at Valentine Park to raise part of the green space to prevent flooding. City Administrator Perrault noted the grant money has to be spent by spring, 2023 so they could replace the playground now rather than lose the money.