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65 West Highway 36 • St. Paull MN 55113 II Bonestroo Rosene Office: 651-636-4600 • Fax: 651-6:6-1311 im vii Anderlik& www.bonestroo.com Associates Engineers&Architects '1 BCEIVED July 12,2005 ,JUL 1 5 2005 Ms.Melanie Curtis CITY OF ORONO Planner City of Orono Post Office Box 66 Crystal Bay,MN 55323 Re: 3165 North Shore Drive File No.000139-05000-0 Plat No.05-3135 Dear Melanie: We have reviewed the site plans dated June 30,2005 for the proposed improvements to 3165 North Shore Drive.The site improvements include the construction of a new home and associated grading. We have the following comments with regards to engineering matters: • The grading plan shows a proposed swale west of the home that drains southerly onto the neighboring property. The grading plan should be revised so this swale contains water on the subject property. • The proposed driveways are shown at the maximum allowed grade of 10%. If this project goes forward care should be taken when constructing the driveways so as not to exceed the 10%grades shown. • The proposed retaining walls along the driveway to the garage exceed 11-feet in height and will require a separate engineered design and detail submittal for review and approval. • The estimated fill required to construct this project is 1350 cubic yards.This equates to approximately 130 truck loads of material that will be imported to the site over the existing shared driveway. There should be some agreement in place between all users of the driveway prior to work on the site that identifies who is responsible for any damages caused by this home construction. • The proposed storm sewer system raises several concerns.The storm sewer shown to serve the driveway to the garage will likely be problematic in larger rain events or when the inlets clog.It is likely the garage could flood as there is no emergency overflow for storm water that cannot enter the storm sewer system. The proposed storm sewer shown east of the home discharges directly to the lake. This is not acceptable and an alternative design should be incorporated into the plan set that routes water towards the lake overland and not through a pipe to enhance water quality. • It is unclear if the existing bituminous driveway shown along the north lot line will remain or will be removed.It appears that the access to the home will be across the shared driveway to the north and if so the existing driveway should be removed to minimize hardcover on this site. • It appears there may be a sanitary sewer manhole located near the northeast corner of the property. The city should verifythe manhole location and easement status.The manhole should be shown on the gradingplan and an easement provided over it if the manhole is on the subject property and no easement exists. If you have any questions please call me at(651)604-4863. Yours very truly, BONESTROO,ROSENE,ANDERLIK&ASSOCIATES, INC. i .3."-^ //.adL�` RECEIVED Tom Kellogg rie" SEP 2 3 2009 Cc: Greg Gappa. City of Orono CITY OF ORONO # 3 43 1 St. Paul, St. Cloud, Rochester, MN ■ Milwaukee, WI • Chicago, IL Affirmative Action/Equal Opportunity t mployer and Employee Owned