11-21-2005 Planning Commission Packet

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- Z335 West Highway 3G • St. Paul, MN 55113 � - Bonestroo Rosene Office: 651-G3G-4600 • Fax:G51-G3G-1311 - Andertil<& www.bonestroo.com � Associates Engineers&Architects November 9,2005 Ms.Janice Gundlach Planner City of Orono Post Office Box 66 � Crystal Bay,MN 55323 ' ; Re: 3848 Norl11 Shore Drive � Pile No.000139-05000-0 Plat No.OS-3161 Dear Janice: We have reviewed the site pl�ns and preliminary plat dated 10/19/OS for the proposed improvements at 3848 North Shore Drive.The plans propose to subdivide three existing lots into-a five lot single family subdivision.The existing plat area is 3.85 acres with 0.08 acres of wetland for a total of 3.77acres,of net plat area. We have the following comments with regards to engineering matters: • The proposed retaining walls exceed 4-feet in height in many areas and approach 10.5-feet in height in some areas. It is unlikely the wall as shown can be cotistructed along Out]ot B on the subject property without obtaining easements from the property owner to the west. A separate engineered design and detail submittal is required for all walls that are greater than 4-feet in height. • The driveway sl�own across Lot ] to service Lot 3 exceeds 10% from the street to elev. 946.00. A 50-foot landing area with grades of less than 2%should be provided at the access onto North Shore Drive. • Plans should include provisions for storn�water rate control and water quality.Ponding calculations,drainage area maps and drainage calculations for the eiltire site should be provided for review and approval. • The plans note that several lots will be custom graded by the builder.This is a concern as drainage issues will likely arise as each lot is graded.We recommend that a grading plan be submitted for the entire site or each lot will need to submit a grading plan for review and approval prior to obtaining a building permit. • The sanitary sewer service should not be connected to the existing manhole. The two services shown will need to be connected to the existing sewer pipe. • The plan indicates that the total area disturbed will be 0.30 acres. If one acre is to be disturbed then the final plans will need to include a detailed temporary and pern�anent erosion and sediment control plan as required by the NPDES pennit application. : The construclion details shown are not the cily standat-d deiails.Sheet�,S-i snould be revised to show tne city standard details. • When the final plans are completed and approved we will prepare a cost estimate for the site improvements as a basis for the financial guarantee required. If you have any questions or need any clar't(ications please contact me at(651)604-4863. Yours very truly, BON�STROO,ROS�NL,ANll�RL11C 8c ASSOC[AT�S,1NC. �.-..�.__.� ��''�i/ � Tom Kellog Cc: Greg Gappa,City of Orono St. Paul, St. Cloud, Rochester, MN ■ Milwaul<ee, WI • Chicago, IL Affirmative Actlon/Equal Opportunity Employer and Employee Owned .