2008-04-02 P & R Packet - Laserfiche WebLink

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Ell I .< c"" .' TO: Parks & Recreation Committee Members FROM: Kim Stephan SUBJECT: Hidden Spring Park DATE: March 28, 2008 The following notes, taken by Chairperson Seeley, are the suggestions made during the meeting held on Wednesday, March 26, 2008 at Hidden Spring Park regarding plans to address the problems with the rain garden and shoreline erosion. In Attendance: Chairperson Suzanne Seeley and Vice-Chairperson Kevin Amundsen, Parks & Recreation Committee Torn Lee, City Council Liaison Mark Statz, City Engineer - Bonestroo Paul Palzer, Public Works Director Greg Thompson, Anoka County Conservation Department Rain Garden . Mr. Thompson suggested using an apparatus that measures soil compression to help determine if the soil layers beneath the rain garden are porous enough to permit appropriate drainage. He mentioned that even if the soil composition is good, heavy construction equipment can compress the compost/sand/soil mixture to the point where it won't drain well. He has the equipment and is willing to corne back after the ground has thawed to measure it for us. . We also talked about testing the drainage by opening up the fire hydrant, measuring the water as it fills the rain garden, then timing the absorption rate. The Rice Creek Watershed District can supply us with the number of gallons that would be equal to a 2 inch rain and the amount of time it should take to drain. Shoreline Erosion The following were the suggestions made by Mr. Thompson: . Install new, sixteen inch bio-Iogs adjacent to the shoreline. . Use a double or triple layering of snow fencing to stop wave action. . Re-establish plantings in the bio-Iogs and for three feet immediately behind the bio-Iogs (in the transition zone) to eighteen inches above the average water level.