07-25-2001 Council Agenda - Laserfiche WebLink

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owarc R. Green Company July 18, 2001 File: 814980J -0240 Mr. Greg Schroeder City of Little Canada 515 Little Canada Road East Little Canada, Minnesota 55117 RE: FM FRATTALONE OFFICE BUILDING CITY OF LITTLE CANADA, MINNESOTA Dear Mr. Schroeder: The original comments for the Frattalone office building plan review were described in a letter to the City Council on June 26, 2001. A copy is attached. Since the original review, drainage calculations have been received and a more detailed review with City staff has been completed. Based on this new information, we would offer the following additional comments: Storm Sewer • The drainage calculations submitted seem to represent the site to the south of Blackturn Pond and are acceptable, however no calculations were received for the Pioneer Cabinet site located on the west side of the Blackturn Pond. • The grading plan shows a normal water level for the proposed stormwater pond at 884.07. However, the outlet of the pond is at 884.01. This should be revised on the plan. • The proposed stormwater pond outlet is shown as an 8 -inch PVC pipe. A minimum 12- inch diameter pipe should be used with some type of control structure. The 8 -inch pipe poses a plugging problem. • Although no pipe lengths or grades are listed, using the invert shown and scaling on the plans, the storm sewer pipes used within the parking lot are at only .19 percent. This percentage is below minimum grade for a majority of the pipe sizes used to maintain sufficient velocities to prevent settling of solids. The upstream structures are four to five feet deep and could be slightly shallower in order to increase slope on the storm sewer pipes to the required minimums. • Although shown on the original plan, no drainage arrows are shown on the revised plans. The drainage arrows should be shown. Utilities • The 8 -inch combined fire protection and domestic water service to the proposed office building should be separated to provide for shut off of domestic water without prohibiting O:\PROJ \814980j \0240 \Ltr - 071801 - Schroeder.doc 1326 Energy Park Drive • St. Paul, I PAGE 30 51/644 -9446 toll free 888/368 -4389