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At the prompting of Mr. Freihammer, Mr. Johnson confirmed that native plants <br /> were planted on this site, using wetland seeds specifically specified by the <br /> Minnesota Department of Transportation (MnDOT) for native plantings and short <br /> grass prairie, with turf grass above that. <br /> Mr. Freihammer noted that this dredging would benefit the city cost-wise in the <br /> future by requiring less maintenance of the underground pipes on Lincoln Drive <br /> that had always been hard to maintain as they were submerged in water. <br /> Member Wozniak asked the last time this pond had been cleaned out and where <br /> the sediment was coming from. <br /> Mr. Ryan advised that the pond was installed in the 1970's and he had been <br /> unable to determine if there had been any subsequent maintenance on it. As for <br /> the origin of the sediment, Mr. Ryan advised that it came primarily from private <br /> parking lots and public streets, and noted the purpose of the ponds was to capture <br /> the sediment before it reached the wetland. However, Mr. Johnson noted the need <br /> for a more accelerated maintenance program for this type of pond or infiltration <br /> system than once every 40 years. <br /> Mr. Freihammer noted that in the past more sand was used for ice maintenance <br /> during the winter than compared to today on parking lots and/or streets, but noted <br /> sediment from grass clippings also impacted those ponds. Mr. Freihammer noted <br /> that there were considerable impervious surfaces in this area; and agreed that 40 <br /> years was a long time from installation to follow-up maintenance. <br /> Member Wozniak asked if there was any cost contribution by adjacent property <br /> owners for such maintenance. <br /> Mr. Johnson responded that this was cit land and it had been originally platted this <br /> way, including any runoff from the Byerly's parking lot. Mr. Johnson noted that <br /> Byerly's maintained their catch basins and piping located within their parking lot, <br /> but as with all similar public areas, the city was responsible for public ponds. <br /> As with all stormwater management throughout the city, Mr. Freihammer <br /> clarified that all city taxpayers, through the city's stormwater utility fee, paid for <br /> that management, and under current city code, there was no direct assessment to <br /> adjacent properties, since the flow was considered public water. <br /> Member Seigler questioned if the pond should be deeper and should have been <br /> excavated more. <br /> Mr. Ryan noted there would have been extra volume available as a result, and <br /> advised that a considerable amount of additional sediment could have been <br /> removed, allowing more gain in area over the next ten years. However, Mr. <br /> Johnson advised that while it may help in some instances to dredge deeper, in <br /> Page 9 of 17 <br />