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LAKE ELMO CITY COUNCIL MINUTES MARCH 15, 1994 7. CITY ENGINEER'S REPORT In his memo dated March 8, 1994 City Engineer Larry Bohrer indicated he 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%. Larry Bohrer reported that at the DNR meeting discussion continued on water quality. It seemed that the DNR and Corp of Engineers were going to accept the pond in its "as built" condition. A number of the members wanted to let the pond function in its normal mode for one year and do some observations. Attorney Dayton made it clear that Lake Elmo would not accept water of a quality that would degrade Olson Lake. In order to keep dialogue going, a proposal was made by Attorney Dayton with the understanding that it would be discussed at this meeting. These are the conditions under which the pond might be allowed to function normally for one year: 1. The VBWD will propose a feasibility study to analyze upstream mitigation measures, mitigation measures in Olson Lake Estate's Pond, and alternate discharge routes. VBWD should fund the cost of the study. 2. The VBWD will pay for the chemical treatment of Olson Lake for one, year. (The residents on the lake pay each year for treatment of the lake.) 3. A spring -time discharge should be done to create capacity in the Olson Lake pond. Also, the Pond shall be treated prior to release, if appropriate. 4. Prior to any other discharge, Olson Lake Estate Pond shall be treated so that phosphorus concentration is no greater than what exists in Olson Lake, 5. A monitoring program shall be conducted to measure the efficiency of the Olson Lake Estates Pond treatment. The Council suggested inviting the Tri Lakes Assoc to the next meeting to keep them appraised of the situation. M/S/C Mottaz/Johnson - that a letter be prepared by the city engineer and administrator stating the city's conditions on which the pond might be allowed normal discharge for one year and forward the letter to VBWD. (Motion carried 4-0).