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vicLcry engineering & Consulting, LLC <br /> 44-1 1 V1111.i,e��ooc.s Drive,r--d""f'ranie•MN 55 3'i'-1-i,- <br /> 052-1 o5-8272 <br /> p.,?52_1o5-3272 2-42e-1?71 <br /> ivic�:rnl �eiche n�c;nE�.c ont <br /> December 4, 2012 RECEIVED Project VEC 12-101 <br /> DEC 21 2012 <br /> Mr. Chris Wagner CITY OF ORONO ORONO COPY <br /> W Landscapes <br /> PO Box 352 <br /> Loretto,MN 5535 <br /> Dear Mr. Wagner: <br /> Re: Drainage Evaluation &Recommendations, Hulbert Residence, Orono, MN <br /> As you requested, Vickery Engineering&Consulting, LLC (VEC) has performed an evaluation <br /> of the proposed drainage through the proposed berm being constructed at 3035 Casco Point Road <br /> in Orono, Minnesota. You indicated the City of Orono had requested the proposed berm and <br /> modified drainage paths be evaluated to determine if it is viable or will cause drainage issues <br /> with the neighboring property. <br /> Background Information <br /> A proposed berm is to be constructed between the driveways of 3025 and 3035 Casco Point <br /> Road in Orono,Minnesota. A boulder wall is also going to be constructed on the 3035 side of <br /> the berm Drainage through the berm is proposed by placing a 4-inch solid PVC pipe from the <br /> "upstream" side to the "downstream" side of the berm. <br /> You provided two surveys of the properties that showed the existing conditions on one and the <br /> proposed conditions (new wall and berm) on the other one. The elevation difference between the <br /> two sides of the berm is approximately 1 foot in 9 lineal feet, or 11 percent,based on the <br /> contours shown. <br /> Conclusions and Recommendations <br /> Based on the contributing area of the driveway adjacent to the berm area, the size of the <br /> proposed pipes, and the proposed elevation difference from one side of the berm to another, it is <br /> recommended that a minimum of three of the 4-inch PVC pipes be placed in the berm to allow <br /> drainage. Approximate suggested locations are shown on the attached sketch. <br /> It is recommended that draintile covers be placed over the ends of the pipes to reduce the <br /> potential for animals creating nests in the pipes or other items clogging the pipes. In addition, <br /> the ends of the pipe should be periodically maintained to ensure they are cleared of leaves and <br /> other debris. This maintenance should be performed on an as-needed basis. <br /> ,CnSineering,jolutions Foran(Instable world <br />