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, � <br /> ��'�. D <br /> 2335 Highway 36 W <br /> St.Paul,MN 55113 <br /> Tel 651-636-4600 <br /> Fax 651-636-1311 <br /> www.bonestroo.com <br /> A�9�� �o, Zo�� �Bonestroo <br /> Michael P. GafFron <br /> Assistant City Administrator <br /> City of Orono • <br /> Post Office Box 66 <br /> Crystal Bay, MN 55323 <br /> Re: 550 Old Crystal Bay Road N - Crystal Bay Business Center <br /> File No. 000139-11000-1 <br /> Plat No. 11-3519 <br /> Dear Melanie: <br /> We have reviewed the plans for the proposed building addition and parking lot modifications for <br /> 550 Oid Crystal Bay Road North located in the Crystal Bay Business Center. The plan is dated 7- <br /> 27-11. We have the following comments with regards to engineering matters: <br /> • Additionai information about the parking lot section such as the specific type of proposed <br /> sand and crushed concrete aggregate must be submitted. Pavement calculations should <br /> be submitted for each typical parking lot section. Previously approved pavement sections <br /> for the compieted portions of the Crystal Bay Business Center are: <br /> o Heavy Duty Pavement <br /> ■ 2" Bituminous Wearing Course MV3 <br /> ■ 2" Bituminous Base Course <br /> ■ 8" Class 5 - 100% crushed <br /> ■ 24" Select Granular Borrow <br /> o Normal Duty Pavement <br /> ■ 1.5" Bituminous Wearing Course MV3 <br /> ■ 1.5" Bituminous Base Course <br /> ■ 6" Class 5- 100%crushed <br /> ■ 12" Select Granular Borrow <br /> : Storm sewer calculations must be submitted showing adequate capacity in the existing <br /> system. <br /> • The proposed storm sewer structure and castings do not match for CBMH 102 and 103. <br /> R-3067 castings require a 2'x3'opening. <br /> • Local emergency overtlow points must be labeled on the plans with at least one foot of <br /> clearance to an adjacent buiiding's floor elevation. <br /> • An emergency overflow must be maintained to the 1023.00 elevation or lower at the <br /> southeast corner of the proposed parking lot. This will provide one foot of clearance for <br /> the existing building to the east. A revised grading plan shouid be submitted showing <br /> this. <br />