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Il <br />G <br />Bonestroo, Rosene, Anderlik a Associates, Inc. <br />2335 W. Trunk Highway 36 <br />St. Paul, MN 55173 <br />612.636.46M <br />September 18, 1986 <br />City of Orono <br />Box 66 <br />Crystal Bay, MN 55323 <br />Attn: Ms. Jeanne Mabusth <br />O <br />Engineers a Architects <br />Re: William Ullrick Res. <br />Conditional Use Permit #1039 <br />Geothermal Systems Analysis <br />File No. 139 <br />Dear Jeanne, <br />(hw a Iownt•w P f <br />M"b", W Rurw.. Y I <br />I —ph l A.*,#4 Pt <br />M,&Uwd A / r :w, P r <br />RMA«I I fwr.r P f <br />J.-n ( IM.-, P I <br />ld... R l .4, P I <br />MuDnr 1. Si Y I <br />Af...�n F lk i .lr P t <br />tbwd/ ( Aws-d, P I <br />Ian A Awd.a P f <br />"W& A Nru..r. P I <br />fed A /N/. P I <br />AIr A/I 1 R.a.Mww Y I <br />MrAwt /I PirII.+A PI <br />II...I 0 I.wArw. 111 <br />fAuxm M pwwwM. P I <br />Ah ewer Ife.A PI <br />Aw"I Mal. YI <br />Joan R WW"d P I <br />A.MMaA Y 4r ... PI <br />Ara* A Mom- P l <br />Atw. R Rd/, P I <br />NW-1 ( Rw.rA 4 1 A <br />f Awln A I,. 1 gun <br />to Al P. W, <br />IIrAM M (M�a.n <br />Sri.w N tfMrhn <br />1 have contacted groundwater experts from the *. Geological Survey, the U.S. <br />Geological Survey and Twin City Testing for iuput concerning the depletion of <br />the Prairie C,i Chein/Jordan Acquifer by random application of geothermal heat- <br />ing/cooling systems. <br />These experts indicate that one home pumping an average of 30 gpm of flow from <br />the Prairie Du Chein/Jordan acquifer or even 100 such homes will have essen- <br />tially no effect upon the acquifer. There is some concern amongst experts and <br />regulating agencies that a concentration of "big users" may be .&using a fluc- <br />tuation of the groundwater level within the acquifer. One such example is the <br />City of St. Paul water system. This syste.-i has caused a noticeable flucttia- <br />tion in the level of the acquifer due to an immense quantity of groundwater <br />withdrawal from a relatively small area. On the other hand, Townsquare in St. <br />Paul has a geothermal system that pumps at a .ate of 1200 gpm without regional <br />depletion of the acquifer. The usage of the acquifer is currently being regu- <br />lated by the DNR and the Health Department. <br />The popularity of geotnermal heating systems for residential properties has <br />been dying out the past couple years as there is no longer an energy credit <br />for their use and the place -sent of such a system is generally not cost-effec- <br />tive. <br />Yours very truly, <br />WMESTR00, ROSEME, AMtMRLIK h ASSOCIATES, INC. <br />Michael C. Lynch <br />MCL: 1 i <br />1932d 30 Year <br />Anniversary <br />