02/14/2007 P&Z Packet - Laserfiche WebLink

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TKDA ENGINEERS • ARCHITECTS • PLANNERS MEMORANDUM 444 Cedar Street, Suite 1500 Saint Paul, MN 55101 -2140 (651) 292 -4400 (651) 292 -0063 fax www.tkda.com To: Thomas D. Prew, P.E. Reference: Comforts of Home Development Copies To: James E. Studenski, P.E. Drainage Review City of Lino Lakes, Minnesota From: Connie J. Taillon, P.E. C.'1 Proj. No.: 13604.012 Date: January 8, 2007 Routing: • The following drainage review is based on these submittals: 1. Preliminary Grading Plan, Utility Plan, and SWPPP submitted by Passe Engineering, Inc. dated June 12, 2006 and revised December 12, 2006. 2. Drainage Report submitted by Passe Engineering, Inc. dated December 12, 2006 Drainage Review Comments: Significant Drainage Issues: 1. The City recognizes that existing houses adjacent to the wetland may not meet current low floor and low opening requirements; therefore, the proposed pond and wetland shall not exceed the existing normal water elevation, flood elevation, and overflow elevation of the existing wetland. The wetland overflow elevation appears to be located northwest of the wetland, not south of the wetland as indicated on the existing conditions watershed map. 2. Pond 3 shall meet current low floor and low opening requirements for existing adjacent houses located west of the site. The pond must be designed to maintain the 100 -year elevation at 2 feet below the low floor elevation of the existing houses, and the emergency overflow is required to be 1 foot below the low openings of the existing houses. As well, the 100 -year elevation of Pond 3, as currently designed, will flood the loading dock of the proposed retail building. 3. The Pond 1 100 -year elevation is within the future CSAH 49 right -of -way. Ponding of water in the public right -of -way is not allowed. 4. Label all low floor elevations of the proposed buildings on the Grading Plan. Low floors are required to be 2 feet above the 100 -year elevation of adjacent water bodies, and 4 feet above seasonally high groundwater elevations. Submit anticipated high ground water elevation information for the site. 5. It appears that a catch basin will replace the upstream flared end section of the existing 24" culvert. Provide calculations showing that the proposed inlet has adequate capacity to convey flow from the existing ditch. In addition, provide flood elevations at the inlet of the culvert under existing and proposed conditions. 6. A 10 foot wide buffer of native vegetation is required from the delineated edge of the existing • wetland. If grading occurs in the buffer, the area shall be restored with native vegetation. The proposed trail is not allowed in the buffer zone of the wetland. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity