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�L ThNG g. 41SSU(1 -AT-ES <br />August 9, 2005 <br />File: 120054E -0240 <br />Ms. Michaelea Oeitjen <br />Sunde Engineering, Inc. <br />4200 W. Old Shakopee Road, Suite 230 <br />Bloomington, MN 55437 -2967 <br />RE: ST JUDE WOODRIDGE EXPANSION <br />CITY OF LITTLE CANADA <br />Dear Ms. Oeltjen: <br />We have received the Stormwater Management Calculations for the St. Jude Woodridge <br />Expansion. The submittal documents were prepared by your office and are dated <br />August 8, 2005. Based upon our review we would offer the following comments. <br />Drainage Calculations <br />1. The comments on the plans previously submitted included a note stating that <br />the access drive should be crowned. Based on this comment the drainage <br />area map is not accurate. The map should be revised and additional catch <br />basins may need to be added based on the revision. <br />2. The existing HydroCAD calculations include only one subcatchment for the <br />entire site. This subcatchment is not routed through the existing wetland and <br />outlet culvert resulting in higher runoff rates than actual. This should be <br />revised. <br />3. It should be noted that the proposed HydroCAD calculations do not take into <br />account any of the improvements for the Future Phase III. While this does <br />not affect the review for the Phase II improvements, outlet modifications may <br />be necessary in the future. <br />4. Subcatchment Number 11 should have a curve number of 100 over the <br />normal surface water area of the existing wetland. <br />5. The drainage area map provided was not to scale and so the plans were <br />used to verify areas. It appears that Subcatchment 101S, 104S, and 105S <br />have incorrect areas. <br />6. The catch basins within the proposed expansion area were modeled as <br />ponds in the HydroCAD calculations. The outlet pipes did not appear to <br />match the information on the plans. Any discrepancies should be revised. <br />Drops across the manholes of 0.1' should be added to the plans. <br />7. The outlet for the existing wetland was modeled as a 12" vertical orifice /grate. <br />The actual outlet shown on the plans is a culvert. This should be revised. <br />Ltr- 080905 -sunde <br />10062 Flanders Court NE, Blaine, MN 55449 - Phone: (763) 780 -0450 - Fax: (763) 780 -0452 <br />