Title
Consider a resolution authorizing the Mayor to execute Quantity Adjustment/Change Order No. 1 with Murphy Pipeline Contractors, Inc. for the AC Waterline Replacement Project - Phase 4.
Body
Based on the history of asbestos-cement (AC) waterline breaks that have occurred within the City, Utility Staff has identified these areas and developed a program to replace these waterlines. Beginning in 2007, the City awarded construction contracts to replace existing AC waterlines in these problem areas by means of pre-chlorinated pipe bursting. This technique allows less impact to City customers by allowing the waterlines to be out-of-service for a short period of time. To date, there have been five projects that have been completed replacing approximately 50,000 Linear Feet (L.F.) of existing AC waterlines with High Density Polyethylene (HDPE) waterlines.
This project replaced approximately 9,950 L.F. of 8-inch AC waterlines with new HDPE waterlines in the Eagles Nest Subdivision. The as-built drawing’s did not indicate the depth of these waterlines. After the contractor began construction, approximately 90% of the waterlines were 2 to 3 times deeper than they expected and accounted for in their bid. CO/QA No. 1 is to compensate the contractor for extra expenses incurred during excavation, spoils removal, added trench protection and additional time per excavation.
CO/QA No. 1 is for $221,288.47 and increases the original contract amount of $1,029,525 to $1,250,813.47.
Cost: $221,288.47
Source of Funds: Self-Financed Water Construction
Recommended Action
Staff Recommends Approval.