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FPai ISCHOELL 8. MPDSOrJ 612 546 9065 1997.04 <br />1 <br />11:52 »479 P,01/02 <br />Schoell S. Madson, Inc. <br />Engineers • Surveyors • P/anners <br />Soil Testing • Environmental Services <br />1 05B0 Wayzata Boulevard. Suite 1 MinnetonKs, IVIN 553D5-1595 <br />Office S1 2-54G-7BQ1 Fax B1 2-54G-SQ65 <br />April 2l, 1997 <br />Michael P. Gaffiron <br />Asst. Planning and Zoning Administrator <br />City of Orono <br />P.O. Box 66 <br />Crystal Bay, MN 55232-0066 <br />Subject:Well Interference <br />Spring Hill Golf Course <br />Orono, Minnesota <br />62676-001 <br />Dear Mr. Gaffron, <br />The purpose of tliis letter is to present to you tlic results of calculatmg the effective radius <br />for the high capacity well to be used for inigatton at Spring Hill Golf Course. To ensure a <br />conser\'iili\ e estimate of the effective radius of the well during pumping, we have used a <br />pumping rate of 750 gpm and an estimated drawdo^Nti of 30 feet. Based on the data tliat is <br />available from the drilling logs in the area, we have calculated u maximum distance that <br />drawdown will be measiu-able to he 93ft feet. At tliis time there arc no wells within this distance <br />of Spring Hill’s irrigation well except those on site. Tlierefore, no private wells should be <br />impacted by the increased pumping from this well. <br />During my e.xamination of the data we have ignored the effect of Long Lake on the <br />piunping levels. Based on a detailed evaluation of the lake level and the water level in tlie <br />domestic wells completed in the sand and gravel unit, the lake will probably act as a buffer for <br />Ihet water levels. However, to be conseivative wc did not include this data in our calculations. <br />Post-it* Fax Noto 7671 <br />From <br />Co/Dept.CO. <br />Phoo« #PKc*«» I* ' <br />Fax# <br />Affirmative Action Equal Opportunity Employer