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Ms. Jeanne A. Mabusth, June 24, 1996 Ciry of Orono Page -2- have recently done an inspection of Watertown Road to determine the source of the problem. From Old Crystal Bay Road to approximately 400 feet east there is an existing ditch and berm which directs the street runoff to a culvert under the bike trail. From approximately 400 to 600 feet east of Old Crystal Bay Road there is no ditch and/or berm to control the street runoff and the drainage flows southwesterly across Lot 1. We would recommend that a small berm be constructed along the north property line of Lot 2. This work would best be accomplished during the grading of Lot 2, currently underway. We suggested that a meeting be held with the City,building contractor, homeowners, Mark Gronberg and original developers if desired to discuss the surface drainage plan and whether any improvements are necessary. The homeowners asked that a copy of the construction plans for Old Crystal Bay Road Addition be provided to them. Sub-surface Drainage: The homeowners discussed how their sump pump runs nearly continuously year-round. The sump pump collects sub-surface water through draintile lines installed beneath the basement floor and within the foundation block. The basement for Lot 1 was installed approximately 4 feet lower than the adjacent drainageway. This creates a high potential for sub-surface drainage problems which must be served by a sump pump. The homeowners are concerned that in the event of a power failure their basement would flood. This concern is valid. Unless a battery powered sump pump is installed or a generator can be used for a power source, it is likely the basement could have water damage during a power failure or sump pump malfunction. Mr. Eiden said that he would have someone install a draintile line from behind the home on Lot 1 all the way to the sedimentation pond at the south end of the development. He said that he would like the City to review the plans when they have been prepared. Due to the nature of the problem we would recommend that the tile line be a minimum of 6 inch perforated pipe installed at least one foot lower than the basement floor, bedded in pea gravel with direct drainage to the pond. A connection should be made to the foundation drain to effectively minimize the need for a sump pump. It may be necessary to obtain easements over the tile line to insure its location and facilitatate future maintenance. F�ec1Se CORt1Ct]il�A�iiiS viiC�if j%vii il^u`v�;il j'CiL:�St1C,`:]S:�b3r�!!lo this rmatter. Yours very truly, BONESTROO, ROSENE,ANDERLIK&ASSOCIATES, INC. �� . � �� Shawn D. Gustafson, P.E. cc: Greg&Jewel Vitas, 2800 Countryside Drive West, Orono,MN 55356 Tony Eiden, Tony Eiden Company,4100 Berkshire Lane,Plymouth,MN 55446 Russ Olson,Clover Hill Company Inc.,Box 354,Loretto, MN 55357 Mark Gronberg,Coffin &Gronberg, Inc.,482 Tamarack Avenue,Long Lake,MN 55356 Jim Deanovic, Peter Andrea Co., 14180 W. 78th Street#120, Eden Prairie,MN 55344 Jim Ostenson,James Development Co., 7808 Creek Ridge Circle#310,Bloomington,MN 55439 John Gerhardson,City of Orono