Memorandum

City of Lawrence

Utilities Department

TO:	David L. Corliss – City Manager Cynthia Wagner - Assistant City Manager Diane Stoddard - Assistant City Manager
FROM:	John Shutak – Utilities Engineer
CC:	Dave Wagner – Director of Utilities Philip Ciesielski – Asst. Director of Utilities Mike Lawless – Asst. Director of Utilities Beth Frailey Krishtalka – Assistant to Director Mark Hegeman – Utilities Operations Superintendent Dave King – Utilities Maintenance Superintendent
Date:	August 15, 2012
RE:	August 21, 2012 Agenda Item – Approve Change Order No. 1 for priority group I of Project UT0919CS General Wastewater Pumping Station Improvements.

Please include the following item on the City Commission Agenda for consideration at the August 21, 2012 meeting:

Authorize the City Manager to execute Change Order No. 1 to the construction contract with EmCon Inc. for priority group I of Project UT0919CS General Wastewater Pumping Station Improvements increasing the contract amount by $54,474.80.

Project Description:

The Department of Utilities budgets a yearly fund for the ongoing maintenance, repair, and, when necessary, replacement of existing wastewater pumping stations within the collection system.

Project Details:

The Department of Utilities operates a number of small (80 to 300 gpm) vac-prime wastewater lift stations to convey sewage to its wastewater treatment plant. These lift stations were installed by the development community to provide service to localized areas of development. The lift stations are typically located in utility easements adjacent to or surrounded by residential property. The existing stations are 15 to 40 years old, many have exceeded their useful lives, are unsafe to maintain as several of the lift stations are classified as confined space entry, many are no longer supported by the original manufacturer and require replacement to bring them up to current KDHE minimum design standards.

The general intent of the project is to replace a number of the existing vac-prime lift stations with rail-mounted submersible pumps, valve vault, overflow prevention, backup power connection and flow metering in order to meet current KDHE minimum design standards. Some modifications to the existing gravity lines upstream of each station may be required. The Department of Utilities will provide wet well level instrumentation, programmable logic controllers and programming. The vac-prime lift stations included in Priority Group I of the General Wastewater Pumping Station Improvements are identified on the attached map.

Project Status:

To date the contractor, EmCon Inc., has completed the installation of the gravity sanitary sewer, precast wet-well and valve vault, and force main piping for pump station 37 and the installation of the precast wet-well, valve vault, and portions of the gravity and force main piping for pump station 35.

At the time pump station 37 was evaluated and designed it was anticipated that additional capacity for pump station 37 would be required in order to provide sanitary sewer service to the World Company property and a portion of the property located north of 15^th Street as shown on the attached exhibit. Areas south of the of the existing service area were anticipated to be served by an existing private pump station and by future gravity sanitary sewer mains installed with the redevelopment of the former Farmland property. At the time this project was advertised and the bid awarded, conceptual planning documents for the former Farmland property were begun. Based on the concepts presented it was anticipated that pump station 37 may be required to serve additional areas as shown on the attached exhibit. In response to the possibility of an expanded service area City staff and the design engineer, Professional Engineering Consultants, evaluated the as-bid gravity sanitary sewer, pumping equipment, and discharge piping capacities as well as wet-well and valve vault sizes. It was determined that upsizing the gravity sanitary sewer, wet-well and valve vault, and discharge piping would be necessary to accommodate the additional service area. The contractor was directed to procure the upsized materials and has since completed the installation thereof.

Change Order No. 1 also includes additional costs associated with the installation of City supplied step down transformers and lockable handles on electrical junction boxes at PS37 and PS35.

Construction Contract Costs:

	Cost	Days
Original Contract	$1,105,954.60	150
Change Order 1	$54,474.80	0
Current Contract Total	$1,160,429.40	150

To date change order adjustments represent 4.9% of the original contract amount.

Project Funding:

These projects will be funded out of the 2009 Department of Utilities bonded construction fund per resolution No. 6835. A total allocation of $2,846,000.00 has been identified for completion of the design and construction of the General Wastewater Pumping Station Improvements, Project UT0919CS, through the bond resolution. The 2009 Bond proceeds are from the 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:

Thank you for your assistance. Please advise if you have any questions.