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m Bonestroo <br />Rosene <br />Anderlik & <br />\j 1 Associates <br />One j »f <br />mx^ •* ■'I <br />-oi«r r <br />t '-/W <br />C Z 'xr <br />< Cxu^ *l <br />•'jf'tt i So*r\ »l <br />*-c«^ ^ 't-rj-fi *l <br />M Lur>^ i. <br />V€-> • MOcr *t <br />•."•c X '£ <br />* iow^w *f <br />V»« • r-t <br />Engineers & Architects <br />t _ JUU <br />M >^r‘v»’ 't <br />• ,,.x- "C <br />'B <br />-•. ^ .V. <br />Septeober 6. 1990 <br />1 •• <br />City of Orono <br />Box 66 <br />Crystal Bay. MN 55323 <br />C'Ty L'i- ir-.'OriG <br />Attn: Mr. John Cerhardson <br />Re: yell No. 3 <br />Orono. KN <br />File No. 13949 <br />Dear John: <br />current status of the constructionI , . provide a report on the. . .. . . . . . . . . .. <br />ot -eix No. 3.^ Based on u..ta trooi test puapmg the well, it appears that the <br />cavity in the Jordan sandstone has not stabilized and -.he well in its present <br />condition^-wi.l puop sand each tiae it is started at rates as low as 500 gpo. <br />Enclosed is a sketch of the well for discussion purposes. Approximately 350 <br />cu. yds. of sandstone was removed by pressurizing and airlifting. <br />Pressurizing is intended to loosen soft material to allow its removal. <br />Pressurization and boiling cycles are conti.nued until little material is drawn <br />into the cavity. These pressurization cycles were completed on the well prior <br />to installing the test pump. <br />Testing or the well was started at a low race and increased in steps as the <br />sand content at each rate decreased. The pumpage race was then reduced to <br />determine the sand free capacity of the well. It was desired to develop well <br />No. 3 at 1000 gpm and tested at rates up to 1600 gpm. Ger.jraily wells of this <br />type pump sand free at rates of 1200-1400 gpa and are operated at the lower <br />1000 gpo. <br />However. Ueli No. 3 wnen pumped continuously was not sand free until the rate <br />was dropped to 50U-6U0 gpo. Because the permanent pump will be started and <br />etupped in respunse to pruiiuce in the hydropnuoatic tank, the test pump wee <br />cycled at 500 gpo. This teat showed that the wwli would pump sand at each <br />start, and therefore cause substantial maintenance problem* in the DumDine <br />tauility and dietrlbutlon syatuu. ** k e <br />233S West Highway 36 • St. Paul. Minnesota 55113 • 612-636-4^»00 - t