2007-P10863 - new structure - Laserfiche WebLink

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2335 Highway 36 W St.Paul,MN 55113 . Tel 651-636-4600 Fax 651-636-1311 www.bonestroo.com �Bonestroo May 2, 2007 Ms. Evelyn Turner Planner City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: 3605 North Shore Drive File No. 000139-07000-1 Grading Plan for Building Permit Dear Evelyn: We have reviewed the grading plan for the proposed house at 3605 North Shore Drive received 4-26-07. We have the following comments with regards to engineering matters: • The slope on the downstream half of the swale to the west of the house is approximately 1.2%. The swale should have a slope of at least 2%. • The proposed slopes adjacent to the south,west,and north edges of the house and garage exceed the maximum allowable of 3:1. The grading plan should be revised such that slopes do not exceed 3:1. • A proposed 934 contour line appears to terminate near the proposed concrete area at the northeast corner of the house. The contour line should be extended to tie into an existing 934 contour. • The proposed 934 contour line intersects an existing 934 contour line in the bituminous drive to the north of the house. The grading should be revised in this area such that contour lines to not cross. • The proposed 934 contours to the west of the house should tie into existing 934 contours along the west property line. • The applicant should be aware that the proposed grading to the south of the house indicates a slope of approximately 25%across the patio. This is rather steep. • A swale should be constructed to the east of the house to prevent runoff from draining onto the property to the east. • It is not clear where the area at the northwest corner of the site will drain. More information, such as spot elevations and contour lines should be provided in this area and drainage patterns should be clearly indicated on the plan. • The plan shows a solid line beginning at the east side of the garage, running parallel along the north edge of the house, and then curving north into the fire lane area. The plan should indicate what this line is. • Final plans should include erosion and sediment control details.