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• • M E M O R A N D U M 9 MONTGOMERY WATSON To: Kate Drewry, District Administrator Date: From: Derek Knapp, P.E. Reference: Subject: Otter Lake Drive Hockey Rink/Easement Vacation October 12, 1999 The purpose of this memorandum is to provide you with the results of my analysis of the Otter Lake Drive Hockey Rink/Easement Vacation situation in Lino Lakes and provide recommendations toward issue resolution. I have purposely omitted a detailed project history since it has been documented in detail through recent correspondence by the property owners (Melton and Schwartz), City of Lino Lakes, and RCWD. RCWD ISSUES The main purpose of the original drainage easement was to cover the proposed floodplain fill compensatory storage basin which was to be excavated as part of the Oak Brook Peninsula as shown on the Preliminary Plat and Grading Plan, last revised December 10, 1990 (RCWD Permits 93 -167, 92 -171, and 90 -14). As documented by the City and developer, the compensatory storage basin was not constructed as approved. The basin was to provide 640 cubic yards of compensatory floodplain storage volume below Otter Lake's flood elevation of 912.9. It is unclear at this time if the basin, as constructed, provides the requisite compensatory storage volume to meet RCWD standards. Drainage and ponding easements are required by the RCWD also to ensure the preservation of existing and/or proposed drainage features, including stormwater ponds, natural or constructed stormwater collection and conveyance -systems, wetlands, floodplain, and all other hydrologic features. Approximately one -half of the hockey rink was constructed in the platted drainage and utility easement. Also, the stormwater pond/compensatory storage basin was partially constructed outside the existing easement. In this particular case, RCWD concerns over the easement issue are only related to adequate compensatory floodplain storage volume and maintenance of drainage patterns affecting off -site landowners. RESULTS OF SITE REVIEW 41) The following describe the results of my review, separated by issue.