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June 26, 2001 File: 814980J -0240 R. Green Company The Honorable Mayor and City Council City of Little Canada 5 Little Canada Road Little Canada, Minnesota 55117 RE: FRATTALONE OFFICE BUILDING CITY OF LITTLE CANADA, MINNESOTA Dear Council Members: As requested, we have reviewed the grading plans submitted for the Frattalone office building site. The submittal consisted of a grading plan prepared by Sunde Engineering, Inc., dated June 19, 2001. Based on the review, we would offer the following comments: 1. No drainage calculations or storm sewer calculations were submitted with the grading plan. Calculations need to be submitted for review and approval. 2. The proposed contours in the northwest comer of the site do not match into the existing contours. Modifications will need to be made to the proposed grading to tie into these existing contours. During a heavy rain event, it appears there may be runoff from the site dlrectly into Blacktum Pond in the northwest corner of the property. We would suggest a berm be graded along the edge of the 50 -foot setback to contain the drainage within the site. 3. The slopes in the northeast comer of the site are shown as 2:1 and 1:1 slopes. These slopes are difficult to maintain. We suggest more gradual sloping of 3:1 or greater. In the area of the 1:1 slope, a retaining wall may need to be constructed, 4. A grade break is shown on each driveway where water is directed to the east or the west. There is no indication whether or not the stormwater runoff going to the east will go onto Spruce Street where it will need to be collected. 5. The flared end section and rip rap for the pond outlet appear to be constructed directly over one of the 90 -inch conduits within the St. Paul Water Works easement. It may be beneficial to move the outlet to the east or west. 6. The outlet pipe is shown as an 8-inch PVC. This small pipe may have a tendency to plug with debris. It may be beneficial to use a larger outlet pipe with a weir orifice to restrict flow. The stormwater pond should have an emergency overflow constructed with rip rap and geotextile fabric to prevent erosion if the pond overflows, 7. The slopes above the 10 -foot wide bench in the pond are shown at 2:1. These slopes are typically at a 4:1 grade. The pond and grading plan should be sent to Ramsey Washington Metro Watershed for approval and permitting. 8. The water service to the shop and office should be split outside the building so that potable water to these buildings can be shut off by City personnel while maintaining fire protection. An easement allowing access by City forces to the valves is necessary. 9. There appears to be a conflict between the 18 -inch RCP storm sewer and 8 -inch PVC sanitary sewer service to the proposed shop building. o:1P9a.M14960162401ur- 062661 Ao u n dl. doc 1326 Energy Park Drive • St. Paul PAGE 1 651/644 -9446 toll free 888/356 -4389 &NCH P0:31 T00Z- 9Z-Nnr