06-09-1986 Council Packet - Laserfiche WebLink

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Bonestroo, Rosene, Anderlik & Associates, Inc. 2335 W. Trunk Highway 36 St. Paul, MN 55113 612.636.4600 June 2, 1986 City of Orono Box e6 Crystal Bay, MN 55323 Attn: Ms. Jeanne Mabusth a Engineers & Architects Re: File No. 139 - 1018 Ulrich Pear Jeanne, Oran G. Ikmsvou. P. F. NOV'I N. Kwrnr. P.E. Jowph C. Andrrld, PE Nrddlord A. Lrmhrr . P L Ric hued E. Jarner, P.E. Jams C. LNwn. PC Glenn R. CooA. P E. A nth A. Gordon. P.L. lhum I L. Aolr., P.E. R,, Amd W. l our•. P.E. Rohrer G. Srh—hr, PC Mdr.ln L. swwrlo, P.F. Donald C. 8uriardr, P.E. Jr— A. Buardon, PC .Nark A. Honwrr, P.E. I rd A. Fwhl. P. F. A!u Awl T Kamrrwnn, P F K..}err N ls—ul 0. Lwkald. P l.. I honrp N'. Parson, P.E. Aha hoe/C. Llna A, P,L A'arrn L. Ndim P F Jr s R. Mulend. P. F. ArnnNh P. Anrlrson, P.E. Amh A. A,Nhmmnn, P.L. S1dr4 R golfs. P E. Robrri C. N"ek, A.I.A. I hwruu L. AnXul. P.E. U "Il L Younc, P L. Chm[s A. Ern k uwn teo M Por'bky Ildrhrn .K Oban Sawn Af. Lhrrhn We have reviewed the question of discharging foundation drains directly to a lake or other body of water. The concerns to be addressed are water quantity and water quality similar to surface water m ;ement. The quantity of water which would be discharged by constructing a pipe to the lake would generally ` greater than discharging onto the ground surface. The rate of discharge wo,._k definitely be faste This problem could be resolved by constructing a drainfield system near the end of the pipe at the shoreline to allow the water to filter more slo,aly into the lake. The water quality would generally be a:: good or better through a foundation drain system discharging directly to the lake. Water discharged onto the ground surface would have an opportunity to collect sediment, fertilizers aid other debris prior to running into the lake. The City currently has Ordinance 3.20 "Rules and Regulations Relating to Sew- erage Service" Subsection 5C. which prohibits the discharge of foundation drains into the sanitary sewer. We would not a need for a new ordinance but would recommend that the City adopt a polic; which allows the discharge of footing drains into a lake or other body of water provided the following 4ontrols are established: 1. Three feet of impervious soils be provided between the ground surface and the foundation drain within 10 feet of the house foundation walls. 2. The outlet end of the drain be set at elevation 930.5 in the case of Lake Minnetonka or one foot above the normal water elevation for other bodies of water. 5467d Page i - 30 Year Anniversary