09-13-1999 Council Packet - Laserfiche WebLink

Home Browse Search

Il» 1/1 Bonestroo Rosene ^5 Anderlik & Associates Engineers & Architects Boneitroo, Bosene. Anderhk Associates, foe ts An AffirmMi^e Action/iqujt Opportunity Bmptoyer Principals. Otto G Bonestroo. ?t • Joseph C Anderlik. PE • Marvin L. Sorvaia. P£. • Glenn R. Cook. PC • Robert G Schumchf. PE. • Jerry A. Bourdon. P£ • Robert W Rosene. PE. Richard E Turner. PE and Susan M Cberiin. C PA . Senior Consultants Associate Principals Howard A. Sanford. PE • Ke»th A. Gordon. PE- • Robert R. Pfefferle. PE. • Richard W Foster. PE • David O Loskota. PE. • Robert C Russek. A I.A. • Mark A. Hanson. PE. • Michael r. Rautmann. PE • Ted K Field. PE. • Kenneth P Anderson. PE. • Mark R. Rolfs. PC. • Sidney P Williamson. PE. L S • Robert F Kotsmith • Agnes M Ring • Allan Rick Schmidt. PE. Offices: St. Paul. Rochester. Wiiimar and St Cloud. MN • Wiiw.iukee. wi WeOsite WWW bonestroo com August 17, 1999 Mr. Jack Brinkhaus Public Works Superv isor City of Oronc PO Bo.x 66 2750 Kelly Parkway Crystal Bay, MN 55323-0066 Re: Well No. 1 Rehabilitation BRA File No. 139-98-000 Dear Jack: As requested, we have reviewed the construction and maintenance records for Well No. 1. Well No. 1 is the larger of the two wells that supply the Navarre system. The pump was last inspected and repaired 10 years ago. Well pumps are typically inspected and repaired every 7 to 10 years. .At this time. Well No. 1 is used for standby due to poor water quality and unusual operation. Well No. 2 was rehabilitated and redeveloped in 1997. Well No. 2 is meeting the water demands in the Navarre System. The present operation of Well No. 1 can be summarized as follows: The well capacity has not declined and is at approximately 1,200 gpm. The well is normally throttled to 1,000 gpm. Water quality has appeared to decline in the last year, based on subjective observations of taste, color, and odor. These problems may have worsened while the well was out of service during the water treatment facility renovation. Although Well No. 1 had significant run time during the plant start-up, water quality did not noticeably improve. After the pump shuts off, water and air bubble out from cracks in the floor around the pump base. This indicates mechanical problems with the top of the well, pump, or casing vent. The pump would need to be pulled to determine the nature of the problem. At diis time, the inner casing is believed to be vented. Due to the unusual construction of the well, a vent may also be needed on the outer casing to eliminate this problem. Maintenance History The well and pump were new in 1971. The pump was repaired in 1978 and 1989. The 1989 pump repairs consisted of: Replacement of the pump bowl assembly and tailpipe. Replacement of most of the 10-foot column pipes. Nineteen of the twenty-eight column pipes were replaced. Replacement of one stainless steel IQ-foot lineshaft. The remaining lineshafts are non-sleeved stainless steel and were flipped end-for-end to obtain a fresh wear surface at the bearing locations. 2335 West Highway 36 ■ St. Paul, MN 55113 • 651-636*4600 ■ Fax: 651*636*1311 1 1