Title
Proposed Change Order No. 1
Contract No. 2101680/SCN-0000436
Lake Huron Water Treatment Plant Progressive Design Build Instrumentation Controls Improvements
CIP #111006 / BCE Score: 77.10
Body
Agenda of: July 23, 2025
Item No.: 2025-212
Amount: Original Contract Amount $ 5,125,915.00
Proposed Change Order No. 1 77,328,241.00
Total Contract Amount $82,454,156.00
TO: The Honorable
Board of Directors
Great Lakes Water Authority
FROM: Suzanne R. Coffey, P.E.
Chief Executive Officer
Great Lakes Water Authority
DATE: June 26, 2025
RE: Proposed Change Order No. 1
Contract No. 2101680/SCN-0000436
Lake Huron Water Treatment Plant Progressive Design Build Instrumentation Controls Improvements
Vendor: Brown and Caldwell Constructors
Status: Amendment/Change Order
MOTION
Upon recommendation of Cheryl Porter, Chief Operating Officer - Water and Field Services, the Board of Directors (Board) of the Great Lakes Water Authority (GLWA), authorizes the Chief Executive Officer (CEO) to enter into Contract No. 2101680/SCN-0000436, Proposed Change Order No. 1 “Lake Huron Water Treatment Plant Progressive Design Build Instrumentation Controls Improvements” with Brown and Caldwell Constructors, with an increased cost of $77,328,241.00 for a total cost not to exceed $82,454,156.00 and an increased duration of 480 days for a total duration of 2,480 days; and authorizes the CEO to take such other action as may be necessary to accomplish the intent of this vote.
BACKGROUND
Contract No. 2101680 is a progressive design-build contract focused on the rehabilitation of the instrumentation and select controls at the Lake Huron Water Treatment Plant (LHWTP). This contract has successfully completed its Phase 1 Design obligations and this Proposed Change Order serves as the Phase 2 Work and Pricing Amendment, allowing the installation of the work. The project addresses both long outstanding issues with the overall network architecture for LHWTP, obsolescence of its Control Room, and failures and inadequacies of individual systems throughout the plant. These systems include the chlorine, filter, backwash, Hydropneumatic, waste wash-water, raw water flow monitoring, alum, and fluoride systems. This project will completely modernize the controls and data acquisition of the filtration system, eliminating multiple single points of failure. Contract No. 2101680 is anticipated to be substantially completed by June 15, 2029.
JUSTIFICATION
The majority of the existing control software, control, instrumentation, network, and related process equipment was installed as part of the upgrade during the 1990s. This upgrade included a few version updates, and needs replacement, with some elements being original to the early 1970s. Filter control and operation is particularly in need of upgrading. The system includes a myriad of systems that are controlled by around 10 different models of Programmable Logic Controllers of which many are obsolete.
PROJECT MANAGEMENT STATUS
Original Contract Time 2,000 days (06/20/2023 - 12/10/2028)
Proposed Change Order No. 1 480 days (12/11/2028 - 04/05/2030)
New Contract Time 2,480 days (06/20/2023 - 04/05/2030)
PROJECT ESTIMATE
Original Contract Price $ 5,125,915.00
Proposed Change Order No. 1 77,328,241.00
New Contract Total $82,454,156.00
FINANCIAL PLAN IMPACT
Summary: Sufficient funds are provided in the financial plan for this project.
Funding Source: 5519 - Water Construction Fund
Cost Center: 880000 - Capital Improvement Fund
Expense Type: 616900 - Construction
Estimated Cost by Year and Related Estimating Variance: See table below.
Fiscal Year
Prior FY Planned Spend $14,726,000.00
FY 2026 Planned Spend 20,902,000.00
FY 2027 Planned Spend 20,251,000.00
FY 2028 Planned Spend 11,781,000.00
FY 2029 Planned Spend 7,788,000.00
Financial Plan Estimate $75,448,000.00
Proposed Change Order Award Total 82,454,200.00
Estimating Variance $ (7,006,200.00)
FY 2026 Plan Spend per CIP $20,902,000.00
FY 2026 Plan Spend adjusted for award value 10,078,800.00
FY 2026 Estimating Variance $10,823,200.00
The proposed change order is for the construction phase of a progressive design build contract. A budget amendment will be made to return $10,823,200.00 back to Capital Reserves for FY26. The balance of the estimating variance has been adjusted in the future CIP Plan documents.
COMMITTEE REVIEW
This item was presented to the Operations and Resources Committee at its meeting on July 9, 2025.
SHARED SERVICES IMPACT
This item does not impact the shared services agreement between GLWA and DWSD.