02-25-2015 Council Minutes - Laserfiche WebLink

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MINUTES CITY COUNCIL FEBRUARY 25, 2015 The City Engineer reported that the discharge will be less than what is currently coming off this property, although that discharge would be more concentrated because it is piped. The Engineer indicated that some analysis needs to be done to see if the discharge can be directed into a ditch or storm water system otherwise it will flow across the road. Another option would be to get the runoff piped beyond the Boettner house and discharged higher than the road and spread out over an area. Pechmann asked the flow rate. The City Engineer reported that he will need some updated information from the developer in order to calculate the flow rates exactly, but indicated that there will be no discharge from the rain water garden as the result of a two-year storm. The discharge rate from a 100 -year event will be reduced from what it is now, but a pipe will concentrate the volume so that will be greater. Boettner felt that there will be more drainage and erosion resulting from two houses on this property rather than one. The City Engineer replied that that would depend on the amount of impervious surface that will be added through the development of the property, and noted that the rain water garden would be designed accordingly. Faschinger reported that her house is close to the property line and pointed out the drop of elevation in this area. She noted that the developer will be bringing in a great deal of fill in order to develop the property with driveway access to LaBore Road. Faschinger was concerned that the fill will cause additional run-off from the side yard onto her property. The City Engineer noted that the developer is proposing a retaining wall along the side of the house as well as a swale which will result in less run-off to the side lot line. The Engineer indicated that the property elevation in the front will be increased by about 9 feet to tie the driveways into LaBore Road. The retaining wall will be a maximum of 4 feet in height. Anything higher will have to be engineered and reviewed by the City. Faschinger expressed concern for ongoing inspection and maintenance of the rain water garden. The City Engineer reported that the City is proposing that a maintenance agreement be executed between the property owner and the City which would allow the City to inspect and provide maintenance of the garden, at the property owner's expense, in the event that the property owner does not do the proper maintenance. Keis asked about enforcement of the grading plan for the property. The City Engineer replied that the grading plan will be reviewed for compliance as part of granting the occupancy permits for the houses. The 5