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Jesse Struve <br /> From: Jesse Struve <br /> Sent: Wednesday, November 28, 2012 9:05 AM <br /> To: Melanie Curtis <br /> Cc: Christine Mattson <br /> Subject: 20121128 3035 Casco Pt Rd -2012-01024 <br /> Melanie, <br /> I have reviewed the submitted survey for the removal of existing bituminous and the installation of a berm and have the <br /> following comments: <br /> • The proposed berm will impact the natural drainage of the land but the application does show a 4" pipe to allow <br /> for water to drain through. I have concerns a 4" pipe may not be sufficient to handle the required flow of a 100 <br /> yr event or when this pipe is frozen in the spring, if there was enough thought given to where the water will go. <br /> The installation of a berm cannot adversely impact the neighboring property. <br /> • A registered engineer needs to evaluate whether a 4" pipe can sufficiently handle the resulting runoff from a <br /> 100yr event and determine if by installing a berm and the pipe is frozen, whether there will be any impact to the <br /> neighboring property. <br /> • What are the top and bottom elevations for the proposed retaining wall? <br /> Without a registered engineer reviewing and signing off that the proposed berm will not result in impacts to the <br /> neighboring property, I will not approve it. It would be my recommendation to grade this area to allow for the water to <br /> pass through it did prior to the removal of the existing bituminous. This area can still be planted as long as the plantings <br /> do not raise the grade which results in the blockage of the existing drainage pattern. <br /> Jesse Struve, PE <br /> Director of Public Works/City Engineer <br /> City of Orono <br /> (952) 249-4661 - Direct <br /> (952) 249-4616 - Fax <br /> www.ci.orono.mn.us <br /> i <br />