correspondence re proposeed house

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� � 2335 Highway 36 W St. Paul, MN 55113 Tel 651-636-4600 Fax 651-636-1311 www.bonestroo.com �u�v 5, 2011 � Bonestroo Melanie Curtis Planning and Zoning Coordinator City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: 3095 Casco Point Road File No. 000139-11000-1 File No. 10-3479 Dear Melanie: We have reviewed the revised plans for the proposed new home and rain garden construction at 3095 Casco Point Road. The site plan is dated 6-30-11. We have the following comments with regards to engineering matters: • It appears there are existing retaining walls along the north property line. The plan should indicate if these walls are to remain or be removed. • It appears that the proposed retaining wall along the north edge of the driveway is approximately 6-8 feet high. Engineered design and details should be submitted for review and approval for all retaining walls over four in height, and for all tiered walls with a separation of less than two times the wall height. • Proposed slopes exceed the maximum allowable slopes of 3:1 in areas, including to the north of the house and along the proposed swale to the south of the house. The grading must be revised in these areas. • The plan shows less than 10 cubic yards of grading within the 0-75'setback to facilitate drainage. The submitted calculations indicate that the rain garden may be too small to handle runoff from its drainage area. The applicant should review and revise the submitted calculations and provide a typical rain garden cross section. If the rain garden footprint needs to be increased, consideration should be given to moving it to the 941 elevation area west of the house. • This project will disturb more than 100 CY of material. Sediment and erosion control information meeting the requirements of Orono's City Code 79-7(c)(2) must be submitted. The minimum $2000 sediment and erosion control financial security should be required of the owner for this permit.