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Christine Mattson From: Robert Bean [bobbe@bolton-menk.com] Sent: Tuesday, November 25, 2014 3:22 PM To: Christine Mattson Cc: Melanie Curtis; Andrew Mack; Adam Edwards; Brian Simmons; David P. Martini Subject: 2014-01334 -2490 Old Beach Road Christine, I have completed review of the Building Permit application package for 2490 Old Beach Road. Following are my comments for City consideration: 1. The silt fence should be revised to be immediately down gradient from the proposed work instead of following the lot lines and shoreline. Silt fence should route around trees to be preserved (e.g. 36"tree along northwest property line and 32" tree northwest of proposed drive circle). Additionally,the silt fence should route around the tennis court to be removed to ensure sediment does not migrate off-site during demolition. The silt fence should be installed and inspected by the City prior to any land disturbing activities. The Contractor must provide a minimum 24 hour notice prior to inspection. 2. Are vehicles to access the lower garage? If so, is the access route to be paved? If additional hardcover is required, it should be included in the hardcover calculations. 3. It is unclear what is proposed for retaining walls. Additional spot elevations should be added to the plans at key locations(e.g. changes in horizontal and vertical alignment). Walls 4' or greater in height must be designed by a licensed professional, and plans must be submitted to the City for review. Walls less than double the height of the upper wall apart shall be considered one wall. 4. Grades and contours must be revised on the southwest side of the garage to accurately depict the 962 contour. Currently, the proposed 962 contour is not indicated between the proposed circle drive and the garage. 5. Additional grading detail should be provided on the southeast corner of the proposed house to define the swale routing runoff around the retaining wall. Additional spot elevations and contours may be necessary to adequately define the Swale and ensure runoff is not directed over the wall. 6. Additional grading detail should be provided along the northwest property line to define swales directing runoff along the property line and not toward the adjacent house. Additional spot elevations and contours may be necessary to adequately define the swales. 7. As a safety measure, the applicant should consider providing fence on top of the wall on the west side of the proposed garage to help keep vehicle and pedestrian traffic from going over the wall. 8. A financial security of$2,500 from the Applicant is recommended for erosion control and engineering oversight. The financial security is intended to provide protection in the event that it becomes necessary for the City to install or maintain erosion and sediment control within the project area and covers the cost of vegetation re- establishment if the applicant is unable to follow through with the conditions of approval. 9. The applicant may be required to obtain Minnehaha Creek Watershed District (MCWD) approval and permitting for their Erosion Control rule. A copy of any approved permit or confirmation that no permit is required should be submitted prior to any land altering activities. If you have any questions or comments, please contact me to discuss. Thanks, Robert E. Bean,Jr, P.E. LEED Green Assoc. Water Resources Engineer Bolton & Menk, Inc. Consulting Engineers&Surveyors 1