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PC Exhibit C <br /> . = BOI-TON 8� M �N K , I NC� <br /> . Consuiting Engineers & Surveyors <br /> " 2638 Shadow Lane,Suite 200•Chaska, MN 55318-1172 <br /> Phone(952)448-8838•Fax(952)448-8805 <br /> www.bolton-menk.com . <br /> May 14,2012 � <br /> City of Orono <br /> Attn:Mike Gaffron ' <br /> PO Box 66 <br /> Orono,Mn 55323 <br /> RE: Land Use Application 12-3547 <br /> House Construction <br /> 790 Brown Road North/PID 34-115-23-11-0003 <br /> Engineering Review#2 <br /> Deaz Mike: <br /> r.. ,. <br /> As requested,we have reviewed the Engineering Field Report by Carl Anderson,dated Apri130,2012, <br /> and the updated Variance Request,dated May 9,2012,regarding the proposed Land Use Application for <br /> the vacant lot at 790 Brown Road North. <br /> Traditionally,the City has not considered information such as the slope stability analysis that has been <br /> provided by the applicant when reviewing proposed encroachments into slope setbacks as defined by City <br /> Code. This is because even with the technical information that has been provided,slope stability can still <br /> not be guaranteed. It is my understanding that the City has past examples where extreme weather events <br /> have led to the failure of slopes that were believed to be stable. This uncertainty is just one of the reasons <br /> ' `the City has adopted the slope setbacks that have been enforced on other proposed projects. With that <br /> understanding,we offer the following comments in addition to the information we have submitted <br /> previously for your consideration: <br /> ,; <br /> 1. The proposed location of the walkout structure is located to minimize grading and potential <br /> � erosion. Positioning the structure immediately above the existing driveway bed provides the most <br /> y stable location with regard to the downhill slope. <br /> . 2. If the lot is detern-rined buoldable,the following items should be considered to prevent down slope <br /> erosion: � <br /> a. Silt fence should�be placed at the downhill edge of the old driveway bed prior to any <br /> work,including tree removal. <br /> b. Disturbed slopes should be seeded and protected with erosion control blanket <br /> immediately after grading is complete. Sodding is also acceptable. <br /> c. All runoff from the new house,yards,walks and driveways should be reviewed for <br /> potential erosion issues due to point dischazges. The use of rain gardens to collect the <br /> new runoff is recommended to limit the peak runoff rates,disperse point discharges, and <br /> prevent erosion. �R:� <br />