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LAKE ELMO CITY COUNCIL MINUTES NOVEMBER 5, 1985 PAGE 3 Mr. & Mrs. Gary Bance advised that behind their house and between the current houses and the park, all the spring runoff comes down to this area and out to the road. They asked what provisions will be made to take care of this water. City Engineer Bohrer stated that what appeared to be high and dry ground has been saturated for a considerable length of time. The land was originally low and was filled during the grading of the subdivision. Somehow this heavy soil has trapped the water and it stays there. Excavating the clay and replacing it with sand would not work in this case because the water from the adjacent soil would just run. Jim Yarusso voiced concern as to where the sewage will go because he believes there is a seal somewhere. City Engineer Bohrer advised that the City code allows the bottom most portion of the septic system can be placed in sandy soil, with not less than 4' of separation from the lowest point of the drainfield to the watertable. In this case they are counting the ground surface that exists today as virtually the water table. As long as there is 4' of sand between the bottom of the drainfield and the water table, this is considered adequate to treat the sewage. The applicants are taking some risk because this soil will be tested and the perk rates run in the spring after the soil has been allowed to settle. Roger Johnson, Soil Scientist, stated that what they are proposing is fully within the meaning of the City ordinance as far as providing the necessary separation distance. The City Council asked Kurt Laughinghouse to provide a more detailed plan which will address surface drainage, creating contours that will be acceptable and compatible with the neighborhood. At a later date, the suitability of the lots for building purposes will be addressed. D. 509 Plan: Council position on current revisions to the January, 1985 509 Plan document. In the Council packets there was information regarding the planned VBWD's revisions to the 509 Plan. The City Engineer stated that his one concern was over the revision in the proposed outlet elevations of the lakes. The VBWD plans to meet the DNR's requirements, which are considerably higher elevations than what was originally proposed by the managers, but place the pipes low enough to allow future reduction in the lake levels if the DNR's position can be altered. This would mean some type of a weir. The City Engineer was concerned about what the new computed flood levels would be above these outlets. Mayor Morgan expressed concern about the schedule in which it is proposed that no construction begin until 1987 and concern for the financing plan which changes from a 100% ad valorem tax to