Memorandum

City of Lawrence

Department of Utilities

TO:	David L. Corliss, City Manager Cynthia Wagner, Assistant City Manager Diane Stoddard, Assistant City Manager
FROM:	Philip E. Ciesielski, Assistant Director of Utilities
CC:	Dave Wagner, Director of Utilities Mike Lawless, Assistant Director of Utilities Beth Krishtalka, Assistant to Director Mark Hegeman, Utilities Operations Superintendent Dave King, Utilities Maintenance Superintendent
	March 19, 2012
RE:	Agenda Item – Execute Change Order No.2 for Project UT0906DS Kaw Water Treatment Plant Large Valve Replacement.

Please include the following item on the City Commission agenda for consideration at the March 27, 2012 meeting:

Authorize the City Manager to execute Change Order No.2 to the existing construction contract with Nowak Construction for Project UT0906DS Kaw Water Treatment Plant Large Valve Replacement increasing the contract amount by $20,070.00 and increasing the contract time by 4 days.

Project Details

Through the valve exercising program Utilities Department staff have identified large diameter water distribution system isolation valves at various locations that either do not operate, or operate but do not fully seal. These valves are typically 16” in diameter or larger and on water transmission lines of similar diameters. Because there are fewer connecting watermains, and the operational need to isolate a larger diameter water transmission main is infrequent, the number of valves on large diameter water transmission mains are fewer and are located at greater distances apart than those on the smaller water mains that make up the bulk of the water distribution system. This makes the need for each available valve to be fully operational critical to allow timely shutdown in the event of an emergency.

The current project scope is designed to address the replacement of four (4) inoperable valves on the Kaw Water Treatment Plant Central Service high service pump discharge transmission mains. These four first tier valves are critical in the event the Kaw WTP needs to be isolated from the transmission system. The project scope replaces four (4) 16” to 24” diameter butterfly valves, 360 linear feet of 24” diameter cast iron transmission main, and two (2) 24” diameter check valves. The two 24” butterfly and check valve combinations date to 1955 and 1958 and are in concrete vaults within the 3^rd Street right-of-way. The 24” diameter transmission main dates to 1955 and 1958, and the two 16” butterfly valves in Indiana St. date to 1954 and the early 1900’s.

The concrete vaults will be demolished eliminating a confined space hazard for staff and cleaning up the surface area in the right-of-way. The new butterfly valves will be a direct-bury type with only a standard valve box visible at grade. The two existing check valves will be replaced with a single check valve installed on the high service pump discharge within the Kaw WTP building. The 24” diameter transmission main will be replaced with 36” diameter pipe. Fittings will be installed at the intersection of 3^rd and Indiana to facilitate the future extension of the 36” diameter Kaw Water Treatment Plant Transmission Main through North Lawrence and onto Southeast Lawrence. Project map attached.

Details:

Change Order No.2 represents a net INCREASE to the construction contract of $20,070.00 and INCREASES the contract time by 4 days. The attached change order describes the additional work covered.

In order to keep the project on schedule and return the Kaw Water Treatment Plant to service this work was carried out the week of March 19, 2012. The work involved installing a new tapping sleeve and valve connection on the existing 16” diameter concrete water transmission main in Indiana Street near the entrance to Burcham Park. The watermain feeding Burcham Park and the KU Boathouse was then connected to this point. The existing water feed to the park area was tied to internal Kaw Water Treatment Plant piping and had posed a challenge with the necessary water treatment plant shutdowns. During the current project the park and boathouse were temporarily fed by a connection with pipe run over the ground. This connection provided a lower than normal level of service to the area including normal use of the fire hydrants within the park. During this period the Fire Department was informed of the issue and alternate means of providing water to the area for firefighting were arranged. The new connection to the 16” diameter transmission main serves the park area as part of the water distribution system and will not be affected by future work internal to the Kaw Water Treatment Plant.

BG Consultants and Staff have reviewed the proposed Change Order No.2 and recommend authorizing its execution.

Project Schedule:

Original Contract Project Completion April 13, 2012

Change Order No. 1 Project Completion April 13, 2012

Change Order No. 2 Project Completion April 17, 2012

Construction Contract Costs:

Original Contract $621,017.00

Change Order No.1 $1,680.00

Change Order No.2 $20,070.00

Current Contract Total $642,767.00

To date Change Order adjustments are 3.5% of the original contract amount.

Project Funding

Funds for the construction of the project are from the 2009 Build America Bonds. Per the terms of the Bond these funds must be expended prior to August of 2012 to maintain their non-taxable status.

Action Request