05-24-2006 Council Agenda - Laserfiche WebLink

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Memorandum -Elf CRIN6 .ASSOCI -AT-{S T OF •URT8 TO: Little Canada Mayor and City Council Members FROM: Lee Elfering, City Engineer DATE: May 18, 2006 RE: 2006 Street & Utility Reconstruction Change Order #1 Background The City completed review of the sanitary sewer mains within the project areas prior to the start of the project to verify the condition of the existing lines. During this review a root problem was encountered in the existing Vitrified Clay Pipe (VCP) sanitary line on Morrison Avenue between Demont Avenue and Rose Lane. In an effort to correct the problem without replacement of the line, City crews have attempted to remove the roots with in -line equipment. While they were able to clean a portion of the line, they were unsuccessful on a segment of the line due to the amount and thickness of the roots encountered. The attempts to remove the remaining roots were abandoned when a minor backup of a residence occurred due to the high pressure water that is used in the removal process and the blockage the roots were creating. It is felt that further attempts at cleaning the roots from the lines would result in additional backups into residential homes. Due to the fact that the street will be torn up during the reconstruction project, we requested the Contractor provide pricing for removal and replacement for the segment of the sanitary sewer that was unable to be cleaned. In review of the quote, the prices appear to be reasonable for the work requested and are lower than those received in the bids last year for the replacement of the sanitary sewer on Carla Lane. A copy of the quote for the work is attached for your information. Summary and Recommendations Due to the severity of the root problem and the inability to remove the roots from the in- place line, it would be our recommendation to authorize a change order for the replacement of the sanitary sewer line that was unable to be cleaned. If we proceed with the work, the approximate replacement length is estimated at 200 -feet of the VCP line and 7 service connections. However, the amount corrected may change in the field as the correction is made and the line is inspected. The cost of the sanitary sewer replacement is estimated at $8,970.25. Gravel necessary to maintain access in the trench area for residents during the work and some additional erosion control measures will be paid at the unit prices provided in the quote as they are directed to be used. If you have any questions or would like to discuss this issue please feel free to call me at (763) 780 -0450. C:Documents and Settings \kathy.glanzer`Local Settings \Temporary Internet Files \OLK2D \Memo - 051006 -CC (Morrison Sanitary).doc 10062 Flanders Court NE — Blaine, MN 55449 — (763) 780 -0450 fax (763) 780 -0452