08-20-85 CCM - Laserfiche WebLink

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LAKE ELMO CITY COUNCIL MINUTES AUGUST 20, 1985 Page 4 The five actions are listed in Bohrer's letter dated August 20, 1985 to the City Council. 1. Stop all pumping within the City. 2. Establish a moratorium in new development within the Legion Pond Subwatershed. 3. Install a storm sewer from the Legion Avenue culvert to existing storm sewer in Lake Elmo Avenue. 4. Add fill to the City -owned drainage easement to match filling done by residents on either side. 5. Check monitoring wells for ground water elevations. Moratorium The City could impose a moratorium on building to prevent additional runoff from entering the pond, but our investigations have found the pond level is supported by the groundwater table and surface runoff is a minor contributor to the pond level. The drainage area has not been altered over the years and no new houses have been built since the Legion Avenue homes were built in late 1960's and early 1970's, yet the pond has continued to rise. Storm Sewer It was suggested that a storm sewer be constructed on 30th Street and Legion Avenue to drain the Legion Avenue culvert into the County storm sewer system in Lake Elmo Avenue. A review of old construction plans indicates culvert invert in Legion Avenue to be elevation 890 and invert elevation of storm sewer in Lake Elmo Avenue at 30th Street to be elevation 900; therefore, Legion Avenue will not drain into Lake Elmo Avenue. Added Fill It is estimated that 300 cubic yards of fill would be required in the drainage easement to match the filling done by residents on either side. The estimated cost in labor, material, and equipment to do this work with City forces is $3,500. Monitoring Wells On August 19, 1985, monitoring wells 2 and 3 were checked for groundwater elevation. Monitoring Well No. 1 was not able to be checked because the cap was rusted on tightly. The following is a comparison of results obtained now and 1980: