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HomeMy WebLinkAboutUtilities 2014-02-03 Item 2B - Change Order #1 - Sewer Repair at 6450 Southcenter BoulevardTO: FROM: BY: DATE: SUBJECT: ISSUE City of Tukwila Jim Haggerton, Mayor INFORMATIONAL MEMORANDUM Mayor Haggerton Utilities Committee Bob Giberson, Public Works Director Mike Cusick, Senior Program Manager January 31, 2014 Sewer Repair at 6450 Southcenter Blvd Project No. 91340203 Change Order No. 1 to Contract No. 13 -181 Approve Change Order No.1 to the contract with Green River Construction, Inc. for the Sewer Repair at 6450 Southcenter Blvd in the amount of $104,462.03 (including sales tax). BACKGROUND While cleaning and jetting a plugged sewer line near the intersection of Southcenter Blvd and 65th Ave S, City staff encountered problems that prevented them from clearing the unknown obstruction and resulted in the jet head and hose becoming stuck in the sewer line. Staff was unable to free the hose and it had to be cut and left in the manhole and sewer line. It was determined that the only way the blockage could be cleared was to install a new manhole where the jet hose was stuck. A contract was approved by Council on November 4, 2013 with Green River Construction, Inc. in the amount of $34,164.00 to install the new manhole, clear any blockages, and /or make any other necessary repairs to the sewer main. DISCUSSION The initial excavation work encountered sewage in the soils at approximately 5 feet deep and 2 feet above the sewer pipe. Staff determined that the sewer line must be broken near this location and that bypass pumping would be required for the sewer line to be repaired. A temporary pumping system was installed in order to control raw sewage from continuing to contaminate the work area. With the temporary pumping system in place, the contractor was able to excavate and examine the broken sewer pipe. With the sewer line now exposed, it was found that two orange fiber optic ducts installed by directional boring equipment had broken through the sewer line at multiple locations. Because the fiber optic ducts were installed adjacent to the sewer line, the trench length had to be greatly increased to determine if there was any further damage to our sewer pipe and to allow for the necessary repairs. The scope of the actual sewer repairs changed dramatically from the scope of the repair project that was awarded to Green River Construction, Inc. Since the bid items do not accurately reflect the work that was performed, the contract work was tracked on a time and material basis in order to calculate fair compensation for the contractor's effort. The changed scope of work also merits an extension of contract time for the contractor to complete landscaping and irrigation work to March 31, 2014. W: \PW Eng \PROJECTS\A- SW Projects \2013 Annual Sewer Repair (91340201) \Sewer Repair at 6450 SC Blvd (91340203) \Info Memo 65th CHANGE ORDER 1 JAN 24 2014 RRT gl.doc 17 INFORMATIONAL MEMO Page 2 FINANCIAL IMPACT The original construction contract was $34,164.00 (including sales tax) for the sewer manhole installation. The additional scope of work included the installation of approximately 100 feet of sewer pipe, traffic control, landscaping, and pavement/sidewalk restoration for a total of $104,462.03. As this is an emergency repair, the project was not budgeted and construction costs will come from the Sewer Fund's ending fund balance. While the final cost of this project is significantly more than the awarded bid amount, this change order reflects the tracking of actual costs to the contractor and includes standard mark -ups for force account items. The time and material approach was the most reasonable and equitable solution to compensate for the changed conditions during construction and complete the necessary repairs. The City will be filing a claim against Comcast and their contractor for the damages to the sewer line and costs incurred for the repair by the City. Original Contract Amount $ 31,200.00 Change Order No. 1 95,399.11 Sales Tax (9.5 %) 12,026.92 Total $138.626.03 RECOMMENDATION Council is being asked to approve Change Order No. 1 in the amount of $104,462.03 (including sales tax) to Contract No. 13 -181 with Green River Construction Co., Inc. for the Sewer Repair at 6450 Southcenter Blvd and consider this item at the February 10, 2014 Committee of the Whole and subsequent February 18, 2014 Regular Meeting. Attachments: Change Order No. 1 Site Photos W:1PW Eng1PROJECTS1A- SW Projects12013 Annual Sewer Repair (91340201)1Sewer Repair at 6450 SC Blvd (91340203)1Info Memo 65th CHANGE ORDER 1 JAN 24 2014 RRT gl.doc 18 CITY OF TUKWILA CONTRACT CHANGE ORDER NO. 01 DATE: JANUARY 28, 2014 BUDGET NO.: PROJECT NO.: 91340203 CONTRACT NO.: 13 -181 PROJECT NAME: SEWER REPAIR AT 6450 SOUTHCENTER BLVD. TO: JERRY KNUDSON You are hereby directed to make the herein described changes to the plans and specifications or do the following described work not included in the plans and specifications on this contract: NOTE: This change order is not effective until approved by the "Owner" and a notice to proceed is issued. Conditions: A. The following change, and work affected thereby, are subject to all contract stipulations and covenants; B. The rights of the "Owner" are not prejudiced; and C. All claims against the "Owner" which are incidental to or as a consequence of this change are waived. D. The Contractor Must Submit all Field Overhead and Home Office Overhead rates for approval in advance of all Change Orders. CHANGE: Revise the fixed amount contract to force account for the repair of the sewer near 6450 Southcenter Bvld. Please see Information Memo There is 121 Day in time extension with this Change Order due to change in scope the project. We the undersigned Contractor, have given careful consideration to the change proposed and hereby agree, if this proposal is approved, that we will provide all equipment, furnish all materials, except as may otherwise be noted above, and perform all services necessary for the work above specified, and will accept as full payment therefore the prices shown above and below. ACCE : Date / , 3 - 1 1-/ Contractor 1-", v-ecni /Qrv& 2 CU,d,_d 2 vC By 174.441-J_Ov-. Title PRD V/ Yvr Origin I ContrWct (without tax) $ 31,200.00 APPROVED BY THE CITY OF TUKWILA Previous Change Order $ 0.00 Date This Change Order (without tax) $ 95,399.11 By Mayor REV. CONTRACT AMOUNT $ 126,599.11 ORIGINAL: City Clerk (1 of 2) Contractor (2 of 2) cc: Finance Department (w /encumbrance); Construction Inspector; Construction Engineer; file: 19 CONTRACT CHANGE ORDER NO. 01 CHANGE: Sheet 2 of 2 During the first day of work on November 14, 2013, Green River Construction began excavating for the proposed sewer manhole in front of the business at 6450 Southcenter Blvd. The contractor excavated down above the sewer line near where the City of Tukwila staff determined the end of the Vactor truck jetting hose was lodged in the sewer pipe. The contractor was down about 5 feet from the surface and 2 feet above the sewer pipe, when sewage came boiling out of the bottom of the trench. The contractor tried to control the sewage flow into the trench with a trash pump. The small trash pump could not keep up with the flow of sewage into the trench. Staff determined that the sewer line must be broken near this location and that bypass pumping would be required for the sewer line to be repaired. The City of Tukwila then contacted Godwin Pumps to provide and install a temporary pumping system around the work area. Godwin installed temporary piping and a large diesel pump with the assistance of Green River Construction on the afternoon of November 14. On November 15, with the temporary pumping system up and running, Green River was able to excavate down to the sewer pipe. With the sewer line now exposed it was found that two orange poly fiber optic ducts were running parallel and immediately adjacent to the sewer line and the sewer line was broken in two places. The Vactor Truck jet hose could be seen inside the sewer pipe. The original scope of the project was to open up about 15 feet of trench above the sewer line for the installation of the proposed manhole. With the fiber optic ducts running this close to the sewer line the trench length would have to be increased to verify the condition of the sewer line. At this point, there was a major change in conditions in contract for the manhole installation project. The City of Tukwila then requested Green River Construction work under Force Account Rules to repair the sanitary sewer line damaged by the installation of the fiber optic cables by Comcast earlier in the summer 2013. The installation of manhole was deleted from scope of the contract. The revised scope of work is to repair the damaged sanitary sewer line and restore the disturbed area back to the existing condition prior to the repair. This work is to done by Force Account for the sewer repair and fixed dollar amount for the site restoration. Please see attached invoice and documentation from Green River Construction to justify the project costs. 20 22