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MINUTES APPROVT"D:11arch 22, 1994 LAKE ELMO CITY COUNCIL MINUTES MARCH 8, 1994 Acting Mayor Johnston called the city council meeting to order at 6:10 p.m. in the city council chambers. PRESENT: Mottaz, Conlin, Johnston, Johnson, City Engineer Bohrer, City Planner Schwanke, Attorney Chuck Dayton and Administrator Kueffner. ABSENT: Mayor John. 1. AGENDA Add: 3A. Update on Legislative Hearing, 3B. Afton City Officials to be reimbursed for legal fees. M/S/C Conlin/Johnson - to approve the March 8, 1994 city council agenda as amended. (Motion carried 4-0). 2. MINUTES: February 22, 1994 M/S/C Conlin/Johnson - to approve the February 22, 1994 city council minutes as presented. (Motion carried 4-0). 3. Discuss the Olson Lake Pond Survey with Attorney Chuck Dayton and City Engineer, Larry Bohrer Larry Bohrer submitted a memo dated March 8, 1994 indicating he has made a calculation of the volume of Olson Lake Estates pond represented in the "as - approved" plan and compared it to the "as -constructed" plan as prepared by the DNR. Pond volume below the outlet elevation is considered "dead" storage. It is this volume which is most beneficial for water quality improvement. We find that the dead storage as constructed exceeds the dead storage provided by the approved plan by 13%. Attorney Dayton stated that the size of the pond is only one of the issues. The real question is what is the quality of water being transferred from this pond into Olson Lake and what the affect of this water will have on the quality of Olson Lake. The water is stormwater runoff from urban area that is going to have nutrients and phosphorus. A water quality analyst from PCA suggested alum treatments of the water in the pond which had been used in Lake Vadnais and Loon Lake. Bohrer reported the following elevations: 952 constructed runout elevation 965.9 100 yr. High Water level 966.9 VBWD Minimum Building