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I/'ij Bonestroo <br />Rosene <br />&=S Anderlik & <br />Associates <br />Engineers & Architects <br />December 5, 1990 <br />-“5 S V*»”~ *f <br />*< «9«"- »• <br />.■.^ry C Af«gy» »» <br />V4r.~“ i « •> <br />9 •"411 r <br />!* Cvy •* <br />j*,*--- • :s9» 9‘ <br />, -4» f *c <br />»cee" :• *f <br />iuUC V tLrt »• C = ^ <br />*1 <br />'V *f <br />Oc-v-o C dw'flj'w »€ <br />»»*y A SI <br />vjf* A 91 <br />I »<ec: »»• <br />VK“,'r ' *t <br />h:9e* • » •" <br />4 C .xv«c;4 *E <br />’N»-J5 "A *f <br />C ..-v* 9| <br />4 »S <br />4 4- <br />V5-* <br />•os?-* C »u?: <br />•*?-« * •• <br />-SW..''5 * 19 <br />> fffje <br />•.'.••• A va <br />•“'8 > C.'»* <br />xr-K *f <br />V'*r»3 A»,.* <br />• AASewn ' » <br />Oj> * <f.!AAflr »t <br />n <br />Tfi <br />Gty of Orono <br />Box 66 <br />Crystal Bay, MN 53323 <br />Aitn: Mr. John Gerhardson <br />Re: Pumphouse No. 3 <br />Orono, MN <br />File No. 13950 <br />Dear John; <br />This letter is to pro\ide a status repun on the construction of Pumphouse No. 3. The <br />additional development of the well was successful as the desired capacity was achieved. <br />However, the pump will draw some sand each time it starts. The difficult well construction <br />and time for additional development pushed pumphouse construction into cold weather <br />conditions. The contractor has requested compensation for cold weather construction. <br />The well was originally to be completed in June. However, due to nature of the geological <br />transition zone, removal of material to construct the well ca\ity was extremely slow. The <br />well contractor requested additional compensation and waiver of liquidated damages. Only <br />waiver of liquidated damages was allowed and testing of the w-ell was completed late August. <br />Well testing showed that the sandroex formation wus unstable at the desired pumping <br />capacity of 500 gpm. Additional development and testing was undertaken and completed <br />late October. The well pumps sand free at 600 gpm when operated continuously, but pumps <br />d little sand each time it starts. Presently the well is operated from pressure in a <br />hydropneumauc tank and will stan several times a day. After the proposed elevated tank <br />is constructed, the number of stans will be minimized. Two options were investigated to <br />minimize the effect of sand accumulation in the system. <br />1. Rnlarye the well cavitv; More sandrock could be removed to enlarge the cavity <br />similar to that recently completed. As the pump only pulls sand for a short time <br />when started, spending another S30,000 at this time is probably not justified. The city <br />may desire to increase the well capacity in the future and monies could be budgeted <br />for that purpose.