11-26-1997 Council Agenda - Laserfiche WebLink

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1/1/ Bonestroo Rosene Tri Anderlik & Associates Engineers & Architects „itl November 20, 1997 City of Little Canada 515 Little Canada Road Little Canada, MN 55117 Bonestroo, Rosene, Anderlik and Associates, Inc. is an Affirmative Action /Equal Opportunity Employer Principals :Otto G. Bonestroo, PE. • Joseph C. Anderlik. PE. • Marvin L. Sorvala. PE. • Richard E. Turner, PE. • Glenn R. Cook, P.E. • Robert G. Schunicht, BE. • Jerry A. Bourdon. PE. • Robert W, Rosene, P.E. and Susan M. Eberlin. C.PA., Senior Consultants Associate Principals: Howard A. Sanford. PE. • Keith A. Gordon. RE. • Robert R. Pfefferle. PE. • Richard W. Foster. P.E. • David O. Loskota. RE. • Robert C. Russek, A.LA. • Mark A. Hanson. P.E. • Michael T. Rautmann, PE. • Ted K.Field. PE. • Kenneth P Anderson, BE. • Mark R. Rolfs. PE. • Sidney P. Williamson, PE.. L.S. • Robert F. Kotsmith Offices: St. Paul. Rochester, Willmar and SL Cloud, MN • Milwaukee, WI Re: Country Drive Water Main Repair File No. 37235 Honorable Mayor and City Council: The purpose of this letter is to inform you of problems with an existing trunk water main on Country Drive and to recommend a course of action to follow. In 1995, two leaks were detected in the 12 inch diameter trunk water main on Country Drive between Rice Street and Spruce Street (installed in 1971). The City's Public Works Department hired construction firms to repair the leaks shortly after their discovery. It was found that the main was in good condition, but the bolts at two mechanical joint locations (at a tee and a hydrant) had completely corroded away due to the acidic soils in the area. New bolts were installed as part of these repairs, and the joints were wrapped with polyethylene fabric. Because of evidence that other mechanical joints are leaking in the area, a section of this main has been isolated and taken out of service. This loop line provides fire protection strength to the area's water system. Therefore, we feel it imperative that corrections are performed in a timely manner. We have designed a correction for the sections of this main which may contain corrosion problems. This design consists of replacing mechanical joint bolts with special alloyed bolts which are resistant to corrosion. Also, each joint will be wrapped with polyethylene fabric to eliminate direct contact between the bolts and the surrounding soil. The extent of main affected by corrosive soils in unknown. Therefore, the project is arranged in a manner which allows for additional joint repairs, if needed. We feel that this repair project will provide many years of additional Life to the trunk water main and is the most cost effective approach at this point in time. However, due to the fact that these soils are corrosive, this main may have to be replaced before the typical life span of water main (approximately 80 years). This project will also be an opportunity to view and record the condition of the main and mechanical joints in various locations for reference in estimating future improvement timeline and cost. Invitations to quote the project were sent out to four responsible contractors who expressed a willingness to undertake the work. Quotes were received for the Country Drive Water Main Repair Project on Monday, November 3, 1997. Unfortunately, only one quote was received. Transmitted herewith are ten (10) copies of the quote tabulation for your information and file. 2335 West Highway 36 • St. Pau Page 170 1600 • Fax: 612-636 -1311