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INGERSON PROJECT REVIEW GROUP RECOMMENDA TIONS . equates to double the size of a regional pond.61 Ms. Drewry stated that if water is given the opportunity to infiltrate (e.g. through rain gardens) there is no need to build ponds. Ms. Drewry further advised that the best National Urban Runoff Program (NURP) ponds remove only 60% of the phosphorous, a major pollutant, from water. Elimination ofthe holding ponds would also reduce overall construction costs and future City maintenance and clean-up expenditures. The initial BRW feasibility report failed to take into account the fact that a large portion of the land situated between HamJine Ave. and Snelling Ave. is privately owned. Before any installation of ponds eould take place a land survey would be necessary to determine the boundaries ofthe privately owned land. Although topographical maps indicate that runoff water from the Ingerson and Tiller neighborhood flows into this area, the BRW report failed to identify the current amount of water and the anticipated amount of water that will flow into this area. Some Review Group members and Ingerson Project residents have been monitoring this area as well as the Lakc Josephine stream both before and after rainfall including substantial rain fall. This area and its streams in their current structure do collect water, However, neither the area nor the streams have ever overflowed and it appears that the current structure, with some clean- up modifications and/or weirs, is sufficient for its purposes. Assuming this information to be accurate, some Review Group members and Ingerson Projeet residents believe that if a holding pond is built in this area, the pond will sit at a low or empty level the majority of time. If this occurs, the pond has not met its purpose and it would be unsightly and an unnecessary costly expenditure to the City and thus the residents of Arden Hills. . Holding ponds are not just bodies of water that do not require regular expensive maintenance at the cost of the City. If sediment that is collected by holding ponds is not removed on a regular basis, thc holding ponds are no longer effective. In addition to regularly scheduled maintenance and clean-up, the ponds must be cleaned after significant rainfall so that the sediment collected does not flow through if another significant rainfall occurs shortly thereafter. It should be noted that the Rice Creek Watershed District is budgeting $75,000 annually for sediment removal from holding ponds. It was recommended by some Review Group members that if any type of holding ponds are considered, they should be located on the west side of Snelling Ave. which would not be as aesthetically disruptive to a neighborhood yet serve the same purpose as a pond constructed on the east side of Snelling Ave. Greg Brown advised the Review Group that his PMP proposals for future projects may utilize the area on the west side of Snelling Ave. for holding ponds for that area. Natural, but overgrown, streams currently run within the area between Hamline Ave. and Snelling Ave. and flow westward under Snelling Ave. and natural wetlands are located between Ingerson Road and Tiller. If rain gardens are incorporated within the Ingerson Project, the need . 6l May 2, 2000 Review Group Meeting. 24 August 17, 2000