Regional Wastewater System
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Wilson Creek Regional Wastewater Treatment Plant Primary Clarifiers, UV and Centrifuge Improvements, Project No. 301-0606-22; Engineering Services Agreement, Outsourced Inspection Agreement, and Internal Inspection Services
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SUBJECT
recommendation
Authorize award of an engineering services agreement in the amount of $484,113 to Brown and Caldwell, Inc. for construction phase engineering services, an outsourced inspection contract to Mbroh Engineering, Inc., in the amount of $646,800, and authorize internal inspection services in the amount of $404,400.
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PURPOSE
The Wilson Creek Master Plan outlined condition and reliability improvement projects, which are prioritized over the next five years and split into two construction projects. The higher priority project includes replacement of three UV light disinfection trains and additional centrifuge solids processing capacity.
RECOMMENDATION
The Executive Director and NTMWD staff recommend the Board of Directors authorize the award of a contract and services as follows:
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Consultant: |
Brown and Caldwell, Inc |
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Outsourced Inspection: |
Mbroh Engineering, Inc. |
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Scope: |
Engineering Services During Construction, Outsourced and Internal Inspection Services |
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Project: |
No. 301-0606-22; Wilson Creek Regional Wastewater Treatment Plant (RWWTP) Primary Clarifiers, UV and Centrifuge Improvements. |
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Amount: |
Engineering Services During Construction $484,113 Outsourced Inspection Services: $646,800 Internal Inspection Services: $404,400 |
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Committee: |
This was an item on the September 24, 2025, Wastewater Committee meeting agenda |
DRIVER(S) FOR THIS PROJECT
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Strategic Objective: |
1.1 High Quality Services 1.4 Reliable and Resilient Systems |
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☐ Regulatory Compliance |
☐ Asset Condition |
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☐ Capacity |
☒ Redundancy/Resiliency |
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☐ Relocation or External Requests |
☒ Operational Efficiency |
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☐ Safety |
☐ Administrative |
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☐ Policy |
☐ Other _____________ |
BACKGROUND
PROJECT PURPOSE
• The Wilson Creek Master Plan identified condition and reliability improvements, which are prioritized for construction over the next five years. Items included are improvements to the Plant 1 primary clarifiers, the Plant 1 primary sludge pump station, an additional dewatering centrifuge, three Plant 1 aeration basin structural deficiencies, UV improvements and process air and blower development.
• The preliminary design evaluated the recommended improvements and determined additional dewatering centrifuge and UV improvements as high-priority improvements to be constructed first.
• The Wilson Creek RWWTP Primary Clarifier, UV, and Centrifuge Improvements project will be split into two projects, and the high-priority improvements will be completed first.
• Engineering services during construction and inspection services to support the construction are currently being negotiated and will be recommended to the board for consideration in October 2025.
PROJECT COMPONENTS
• Disinfection facility and canopy improvements for UV 601, 602, and 603.
• Addition of one new centrifuge feed pump, sludge grinder, polymer system, and mixing system for bulk polymer storage tanks.
• Replacement of drains from the primary sludge pump station nos. 1 and 2 to the plant drain manholes.
• Electrical and supervisory control and data acquisition (SCADA) improvements for scoped facilities.
ENGINEERING SERVICES AGREEMENT
Engineering services during construction for the Wilson Creek RWWTP Primary Clarifiers, UV and Centrifuge Improvements project are based on a 24-month construction duration in the amount of $484,113. These services include:
• Monthly project management and coordination
• Review of shop drawing submittals, requests for information, proposed change orders and operation and maintenance manuals
• Review of contractor’s monthly progress payment requests
• Site visits and construction meetings
• Startup assistance and substantial and final completion inspections
• Development of record drawings and updated equipment lists
• Updates to the plant operation and maintenance manual
OUTSOURCED INSPECTION SERVICES
• Act as the on-site Owner’s Representative, performing daily construction observations, quality assurance (QA) inspections, and ensuring contractor adherence to plans and specifications.
• Attend and facilitate project meetings, maintain communications with all stakeholders, and coordinate activities, including testing, connections, and facility interruptions.
• Document and review project records, such as daily reports, requests for information (RFIs), change orders, submittals, and as-built drawings, ensuring accuracy and compliance.
• Participate in substantial and final completion inspections, prepare and verify punch lists, and assist with equipment training, startup, and project closeout.
• Review contractor schedules, pay estimates, and project changes, providing feedback and ensuring proper documentation and testing coordination.
• The outsourced inspection services will focus on inspection of electrical and instrumentation components of the project.
The initial term of these services is 24 months at a cost of $646,800. At that point, the services and ongoing needs of the District will be reassessed for possible extension.
INTERNAL INSPECTION SERVICES
NTMWD will provide one civil inspector and one senior inspector to supervise external inspection services. The cost to NTMWD related to this internal inspection coverage is estimated at $404,400.
FUNDING
Funding in the amount of $484,113 to Brown and Caldwell, Inc. for engineering services during construction, $646,800 to Mbroh Engineering, Inc. for outsourced inspection services and funding in the amount of $404,400 for NTMWD internal inspection services will be provided utilizing the Regional Wastewater System Extendable Commercial Paper (ECP) Program as the appropriation source; issuance of ECP notes will occur as cash needs arise.