Agenda Packets - 1987/04/13 - Laserfiche WebLink

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�� 2 MEMO TO: MAYOR AND CITY COUN 2P FROM: CLERK -ADMINISTRATOR DATE: APRIL 8, 1987 SUBJECT: ARDAN AVENUE RETENTION POND As you may recall, in January of this year you directed Staff to perform an evaluation of the retention pond on Ardan Avenue east of Groveland Road in the backyards of the properties located between 2800 and 2832 Ardan Avenue. Staff has completed the evaluation of the situation and determined that the problem is now limited to the properties located at 2832, 2834 and 2816 Ardan Avenue due to the filling that has occurred on these properties. These property owners have done extensive filling in their back- yards which has essentially compounded the problem which existed prior to this filling occurring on a 40 foot drainage easement held by the City. Attached is a map outlining the elevations that currently exist in the easement area as a result of surveying performed by City Staff. You will note that the property identified as Lot ¢2 is of a higher elevation than Lot 41 thus pushing water from their property onto another property which has resulted in the "war" going on where the individual property owners are attempting to add more fill to their yards to prevent the water from getting onto their properties. In reviewing the current situation, Staff has determined that the runoff from these three properties going into their backyards is limited to the runoff from the rear half of their houses and sideyards as well as their rearyards. This runoff is of such a limited nature that a retention pond 22 feet wide and 6 inches deep could retain all of the storm water runoff from these three properties without negatively impacting upon the houses or the Ardan Avenue storm water drainage system. Attached to this memorandum is a design of the system proposed by Staff at this time. Although creation of this 22 foot wide and 6 inch deep retention basin would require a certain amount of excavation to correct the filling that has occurred on these three properties, it -would be of a minimal nature and ultimately could correct problems created by the filling that has been done by each property owner. To accomplish this retention basin and resolve the difficulties the neighbors are experiencing among themselves as well as with the City of Mounds View, Staff would recommend the following: 1) The City contract with a reputable contractor experienced in grading to regrade these three lots such that neither is causing storm