Agenda Packets - 1987/11/23 - Laserfiche WebLink

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MEMO TO: MAYOR AND CITY COUNCIL FROM: CLERK -ADMINISTRATOR -V# U DATE: NOVEMBER 19, 1987 V ROJECT 87-4, SUBJECT: CHANGE COUNTY ROADRT ISANIITARY SEWER O MOUNDS VIEW PRECONSTRUCTION The plans for the reconstruction of the sanitary sewer and abandonment of the lift station on County Road I called for the reuse of a manhole at the intersection of County Road I and Edgewood. Portions of this manhole were upgraded the bottom eight feet of the existing structure being retained for use to allow for the interconnection of the existing sanitary sewer flowing east on County Road I into the new sanitary sewer that would continue to carry the sewage to the MWCC line. The work required per the plans was completed during the week of November 9, however, late in the day on November 16 it was noted that a possible collapse had occurred due to a sinking of the fill material around the manhole. Inspection revealed that leakage of ground water was beginning to occur into the manhole around the old base. The contractor and City crews attempted to with the assistance of Solidification, Inc. grout the interior of the manhole and salvage it, however, cue to Lim amvuit Cf ground�✓ water pressure were unable to accomplish this and we are now faced with having to replace the bottom eight feet of this structure. In order to accomplish this the hole in the area must be redug, the site completely dewacered and approximately two days of work undertaken to remove the manhole replacing the bottom eight feet. A meeting with City Engineer Dan Boxrud, County Engineers, the contractor, Wally Mortenson and myself occurred on the morning of November 19 at which time it was agreed that this work must be done and commenced immediately to avoid any further delays in the project and to avoid a complete collapse of the line which would cause us significant difficulties in handling sanitary sewage in this area. During these discussions I negotiated ar. informal agreement with the contractor whereby they would undertake the work commencing immediately starting with dewatering on this date and rebuilding the manhole on Monday and Tuesday, November 23 and 24. The contractor also agreed to a not to exceed price of $17,000 for this work. At this time Staff would request Council approve a change order to the project to allow for this work to be accomplished at a cost not to exceed $17,000 to be charged to the City's Sanitary Sewer Fund.