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TKDA <br />4. ENGINEERS • ARCHITECTS • PLANNERS <br />MEMORANDUM <br />To: Thomas D. Prew, P.E. Reference: Holiday Stationstore <br />1500 Piper Jaffray Plaza <br />444 Cedar Street <br />Saint Paul, MN 55101 -2140 <br />(651) 292-4400 <br />(651) 292-0083 Fax <br />www.tkda.com <br />Copies To: James E. Studenski, P.E. Drainage Review <br />City of Lino Lakes, Minnesota <br />From: Connie J. Taillon, P.E. Proj. No.: 13810.001 <br />Date: March 2, 2007 Routing: <br />The following drainage review is based on these submittals: <br />1. Holiday Stationstore Preliminary Grading, Utility, and Erosion Control Plans submitted by Insites, <br />dated January 12, 2007 and revised February 28, 2007. <br />2. Holiday Stationstore Stormwater Management Calculations submitted by Sunde Engineering, PLLC, <br />dated February 8, 2007. <br />The following are significant issues that must be addressed prior to preliminary plat approval: <br />11. <br />Rice Creek Watershed District will need to confirm that the wetland delineation shown on the Plans <br />is a constructed pond and not a wetland. <br />2. Include all depressional storage on the site in the existing conditions model and route through the <br />existing storm sewer that discharges to the I35W Right -of -Way. <br />2/14/07 The revised existing conditions HydroCAD model was not submitted. Submit the existing <br />conditions model for review when available. <br />3/2/07 Justify the time of concentration values in the existing conditions model. <br />3. Since disturbed pervious areas are typically compacted during grading operations and will be restored <br />with topsoil, a curve number that corresponds to Type B soils should be used for all disturbed <br />pervious areas in the proposed conditions model. <br />2/14/07 This item has been addressed. <br />4. Existing and proposed rates may change due to modifications of the model based on comments 2 and <br />3 above. Rate control requirements will be reviewed when the updated models are re- submitted. <br />2/14/07 Rate control requirements will be review when the revised existing conditions model is <br />submitted. <br />3/2/07 This item has been addressed. <br />5. The water quality volume in the proposed pond may change due to modifications of proposed curve <br />numbers based on comment 3 above. The water quality volumes will be reviewed when the updated <br />calculations are re- submitted. <br />2/14/07 This item has been addressed. <br />An Employee Owned Company Promoting Affirmative Action and Equal Opportunity <br />