July 25, 2012 - Toho Water Authority

Category:
Attachment(s):
Consent
Contract Change Order
ADDITION OF THE LIFT STATION #25B FORCE MAIN EXTENSION PROJECT TO STRICKLER
BROTHER’S EXISTING LIFT STATION #21B REHAB PROJECT
Explanation: On May 23 rd , the Board approved the Osceola Parkway Force Main construction contract
with Jr. Davis that upsizes approximately 2,900 feet of 6” force main to 8” force main from Lift Station 25B
to the start of the Osceola Parkway Phase 2 Road widening project. This project extends the force main
1,200 feet to the downstream master lift station, which is currently under contract with Strickler Brothers
for rehabilitation.
This force main extension is needed because the existing 8” gravity sewer system receiving the flow from
the existing 6” force main (to be upsized to 8”), is undersized to accommodate the peak flows from the
surrounding area as evidenced by surcharging at the 6” force main discharge manhole. The rehabilitation
of LS-25B, to be constructed upon completion of the force main extension, will upsize the pumps to meet
current flows. The pump upsizing and increased flow will further exacerbate the surcharging problem if
this force main extension is not implemented. These force main upsizing and extension projects are
needed to provide additional capacity, reduce the probability of sewer spills, and also decrease energy
consumption and operational costs through reduced pump run times.
This project must be completed prior to Phase 2 of the County’s Osceola Parkway Road Widening project
that is scheduled to begin construction this October in order to avoid additional costs associated with the
roadway construction. Strickler Brothers, as low bidder, is currently under contract with TWA to rehab LS-
21B, which is at the downstream tie-in point of this force main extension.
Staff has negotiated a price of $108,250.00 with Strickler Brothers to construct the 1,200-foot force main
extension as an addition to their existing contract. Strickler Brother’s pricing is consistent with their low
bid unit prices from their LS-21B Rehab project; i.e. their unit price for directional drilling 800 feet of 12”
force main was $54 per foot and their unit price for this project’s 1,200 feet of 10” force main is $52 per
foot. The price difference is reflective of the pipe material cost and the level of difficulty to perform longerlength
directional drills.
Staff requests a 10% construction contingency for this project.
This project will be funded by budgeted sewer system rehabilitation funds, project #31200.
RECOMMENDATION: Staff recommends approval of the LS-25B Force Main Extension Change Order
to Strickler Brother’s existing Lift Station Rehab project in the amount of $108,250, and a 10%
construction contingency of $10,825.
LS-25B FM Extension-07.25.12.ag
7B