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TKDA ENGINEERS • ARCH t tt; t s • PLANNERS MEMORANDUM 444 Cedar Street, Suite 1500 Saint Paul, MN 55101 -2140 (651) 292 -4400 (651) 292 -0063 fax www.tkda.eom To: Thomas D. Prew, P.E. Reference: Molin Concrete Copies To: James E. Studenski, P.E. Drainage Review City of Lino Lakes, Minnesota From: Connie J. Taillon, P.E. C, -"C Proj. No.: 13810.006 Date: March 30, 2007 Routing: • The following review is based on these submittals: 1. Molin Concrete Addition Preliminary Grading and Utility Plan (Office and Overall) and SWPPP, submitted by Piowe Engineering, dated November 21, 2006, and revised March 22, 2007. 2. Moline Concrete Addition Drainage Calculations, submitted by Plowe Engineering, dated November 16, 2006, and revised January 11, 2007. The following are significant issues that must be addressed prior to preliminary plat approval: 1. Provide information regarding the type of soil and ground water elevation at the location of the infiltration Basin. There should be a minimum of 3 feet of separation between the ground water elevation and the bottom of the infiltration Basin. The following are minor plan, calculations, and drafting corrections that must be addressed prior to final approval: 1. The Grading Plan shows that the proposed culvert located north of the proposed office building is discharging towards the existing office building and ascending slope. Direct the culvert away from the existing building. 2. Determine the high waxer level at the upstream end of the culvert located north of the proposed office building. Label the high water level of the culvert on the Grading and Utility Plan. 3. Show the location and elevation of the emergency overflow for the proposed culvert located north of the proposed office building on the Grading and Utility Plan. The low opening elevations of adjacent buildings are required to be 1 foot above the emergency overflow elevation. 4. It appears that runoff from the parking area located south of the proposed office building flows south to Lilac Street, not to proposed Pond 9, as shown on the watershed maps. Ensure that runoff from the roof of the proposed office building is directed to Pond 9, not to the south parking area. 5. Include a rock construction entrance detail on the Plan. 6. Show the location of the rock construction entrance and silt fence on the Grading and Utility Plan. • An Employee Owned Compan,- 7 4 ig Affirmative Action and Equal Opportunity