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Action: David S. will provide the board with a map of the locations of existing grit chambers for storm drains that feed Karth Lake. 4.3. Proposed changes in lake level control process. Background: At the last meeting Renee Marino proposed we stop the pump before we reach the target level to allow for evaporation and avoid the very low levels that a drought could cause. 4.3.1. Define current process: when is the pump turned on and off? What is the pump capacity? David Swearingen: DNR set the target high level at 936 feet and the target low level at 934 feet. David will give Renee pump specifications the determine its capacity in various conditions including lake level. 4.3.2. Karth Lake water level modeling process: Renee Marino’s Hypothesis: a revision to the pump management policy can reduce water level bounce (i.e., range of high and low levels), which can improve lake quality and its environment while appropriately mitigating risk of damage to shoreline properties. Action: Gary G. will ask Matt Kocian and others at the RCWD to work with Renee M. on the modeling project. 4.4. Was the pump used at all in 2021? No, according to David S. 4.5. Results of removal of excess weeds and debris for 2021– Susan Johnson 23 residents contributed and had weeds and debris removed from the lake adjacent to their property. 164 bags of weeds removed from lake. Susan also removed garbage and logs from the lake. Thanks Susan! 5. New Business 5.1. The City Council recently rezoned Little Johanna from a Recreational Development Lake to a General Development Lake (see ORDINANCE NO. 2021- 007). (Karth Lake is classified as a General Development Lake.) What is the significance, advantages, disadvantages, etc. of each of these classifications? David Swearingen: The main difference is that a General Development Lake has a greater housing density. 5.2. Discovery of a few specimens of purple loosestrife, an invasive plant, on the Karth Lake shores and preliminary plan to remove them. – Susan Johnson Susan found a single plant on their property. Tony reported that it is growing on his neighbor’s property. Gary emphasized that we need to aggressively eradicate this invasive plant before it takes over the lake. Here is some information that Gary gleaned from the MN Dept. of Agriculture and DNR. See: https://www.mda.state.mn.us/plants/pestmanagement/weedcontrol/noxiouslist/purpleloos estrife https://www.dnr.state.mn.us/invasives/aquaticplants/purpleloosestrife/control.html