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STATE OF DEPARTMENT OF NATURAL RESOURCES METRO WATERS, 1200 Warner Road, St. Paul, MN 55106 PHONE NO. 772-7 910 FILE NO. February 16, 1994 rr, -199 Ms. Mary Kueffner City of Lake Elmo 3800 Laverne Avenue North Lake Elmo, MN 55042 RE: DNR Survey of Olson Lake Estates Pond 82-477 Dear Ms. Kueffner: Enclosed is a 1" to 50' scale contour map of the pond which was excavated pursuant to DNR permit no. 89-6135. The DNR Hydrographics Unit Survey Crew surveyed the pond on January 13, 1994. There is a note on the drawing of the southern pond which refers to a depth question due to water levels which slightly exceeded the survey rod they were using. The survey crew is confident that the actual depth is very close to what is shown. We also calculated areas and volumes at several elevations. I would like to give you a couple of weeks to review the attached information before we meet again. I have tentatively set March 10, 1994 from 9 to 12 for this meeting at the Metro Region. It is hoped that approximately the same group as met on September 30, 1993 will be available to attend. This letter is being sent to all participants. Please advise me as soon as possible of any schedule conflicts. At our follow-up meeting I would like you to be prepared to discuss the adequacy of the pond as it now exists to treat the stormwater from both a water quality and quantity perspective. The quantity perspective must consider the elevation of the homes on the south. The water quality issues are more complex, but it is my understanding that there has been a preliminary meeting between Barr Engineering and the MPCA to discuss mutually agreed upon parameters. The entire group should be enlightened and updated as to where this issue is at. Based upon various analyses by the engineers, we will also discuss any recommended alterations to the pond that might better manage and accomplish our somewhat diverse goals. AN EQUAL OPPORTUNITY EMPLOYER