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CR 98-91 Approve Change Order- Excelsior Blvd Water System ImprovementsJune 1, 1998 Overview. Primary Issues to Consider. Supporting Information. Analysis of Issues McCrossan Construction Proposal Water System Diagram F K ■ Council Report 98 -091 Approve Change Order — Excelsior Boulevard Water System Improvements Proposed Action. Staff recommends adoption of the following motion: Move that Council authorize the City Manager to sign an agreement with C. S. McCrossan Construction for construction of additional water distribution system improvements along Excelsior Boulevard. During a recent Utility Division review of upcoming Excelsior Boulevard water system changes it was noticed that it would be prudent to include an additional modification to our system as a part of the Excelsior Blvd reconstruction project. McCrossan Construction will perform the additional work at a cost of $55,000.00. • Change Order construction details Construction Cost review Benefits of this water system improvement Legal Review Change Order Funding Steven J. Stadler, Public Works Director Council Report 98 -091 Page 2 Analysis of Issues. Change Order construction details The work involves extending existing 6" water main pipe from 18 19 and 20th Avenues to the south side of Excelsior Blvd and connecting to an existing 18" water main, installing three (3) steel wet - tapping sleeves with 6" gate valves onto the existing 18" pipe, installing an 18" butterfly valve and disconnecting and plugging an existing 8" pipe at the 17 Avenue intersection. The work would be done in two stages. First, the tapping sleeves would be installed and new 6" pipe extended to the centerline of Excelsior Blvd. Second, the new 6" pipe on the north side of Excelsior would be installed and connected to the existing 6" pipe at 18 19 and 20 Avenues. • Construction Cost review The contractor's $55,000 proposal is based on an estimate of 7 days additional work for a work crew and equipment costing approximately $300 - $400 /hr plus material costs, patching and additional traffic control. The contractor has experienced very slow progress installing pipe along and under Excelsior Boulevard. This is primarily due to having to work around and protect a multitude of existing utilities. The bid for this additional work reflects that negative experience. The contractor may be willing to lower the cost if the actual time required to install the new pipe is Tess than the estimate. Staff is awaiting word from the contractor and will report on this at the Council Meeting. • Benefits of this water system improvement The primary benefit is improved system maintainability. However, water service pressure and ,reliability will also be positively impacted. Maintainability and reliability would improve as this change will allow the city to abandon 1,000+ feet of a 45 -50 year old 8" cast iron water pipe which currently runs along the north boulevard of Excelsior Blvd from 17 Avenue to 20 Avenue. This pipe provides water to the 6" water mains extending up 18 19 and 20 Avenues. Once Excelsior Boulevard is reconstructed, this 8" cast iron pipe will be located directly under the north curbline. Because it will be located under Excelsior Blvd, any future repair on this pipe would be extremely difficult and expensive. Water pressure will be better maintained by eliminating the present 8" pipe and instead providing water from the 18" pipe. Council Report 98 -091 Page 3 • Legal Review. The City Attorney has reviewed this change order and finds no legal reason to recommend against completing this work as proposed, i.e., as a part of the existing Excelsior Blvd reconstruction project. • Chanae Order Funding Staff proposes to fund this work initially as a part of the reconstruction project from the PIR account using TIF revenue bond proceeds. The PIR would be reimbursed next year from the water utility fund through the 1999 budget process. The 1999 reimbursement would also cover other water system improvements already included in the Excelsior Blvd project. 05/29/98 project: Hopkins Watermain Proposal E stimator: Addenda: None Flag Item Div Q rpti o n 1 un • viv -r4 v,L.' 1 1 50 450mm x 150mm Wet Tap WNalve EA 2 2 50 150mm Ductile Iron Pipe (Under Traffi M 3 3 50 150mm" Ductile Iron Pipe (No Traffic) M 4 4 50 Cut in 450mm Butterfly Valve & Box EA 5 5 50 Disconnect 200mm GIP & Plug LS 6 6 35 Aggregate Base Class 5 MT 7 7 70 Bituminous Patching MT 8 8 60 Traffic Control LS Bid Date: Bid Time: Unit Q1aQ.i'_t/ 3,00 45.73 45.73 1.00 1.00 90.91 90,91 1.00 BidaatrLne Total Bal Bid 55,000001 L BALANCED Unit Bid Pricy Extension 2,500.001 7,500.00 360.80 ; r 16, 500.00 278.801 12,750.001 4,000.001 4,Q 0 1,250.00 1,250 001 27.501 2,500.00 77.001 7,000.001 3.500.001 3,500.00 01:47 PM { L__.