Municipal Wastewater Treatment

Sample Engagements:

Evaluation and Rehabilitation of Degraded Concrete in WWTP Secondary Clarifiers and Associated Channels:


A major wastewater treatment agency in the western US found that all connecting sewer conduits and box channels from primary to secondary treatment and all secondary clarifiers had suffered from carbonation-related damage over 35 years of service and required concrete rehabilitation.

Problem Solving:

CPI provided field engineering and quality control inspection and testing services for this project. This included shotcrete mix design testing and analysis and materials consulting assistance to the agency.

The project involved ultra high-pressure water blasting to remove degraded concrete, and installation of a pre-bagged wet shotcrete (using a portable batch plant) lining over all typically submerged surfaces. Crack repairs, including structural pressure grouting (epoxy injection) and water cut-off pressure grouting (water reactive polyurethane grouts), were also overseen and inspected by CPI during construction.

For quality control testing and inspection, CPI provided a lead field engineer and a team of certified and experienced inspectors using a mobile testing laboratory.

Customer Benefits

CPI's design and QA/QC expertise resulted in successful rehabilitation of all affected concrete. CPI's project management efforts helped assure all project submittals and deadlines were met.


Service Areas

  • Corrosion and Materials Engineering
    • Corrosion Control/Protection Design
    • Corrosion Analysis and Material Selection Consulting
    • Failure Analysis - Mode and Root Cause Analysis
    • Cathodic Protection System Design and Evaluation
  • Structural and Mechanical Rehabilitation Services
    • Structural Design Engineering
    • Mechanical Design Engineering
    • Condition Assessment Evaluations
    • Structural Evaluation and Analysis
    • Shop and Field QC Inspection and Support
  • Mechanical Integrity and Inspection Design Services
    • Pressure Vessel and Tank Program Development and Implementation
    • Systematic Inspection Design (SID)
    • Risk-Based Inspection
    • Integrity Evaluation and Analysis
    • Fitness-for-Service Evaluations
    • Welding Consulting and Inspection
  • Coatings and Linings Engineering
    • Consulting
    • Failure Analysis
    • Project Management
    • Quality Control and Inspections
  • Project and Quality Management Services
    • Cost Estimating Services for all Construction Disciplines
    • Project Management Services, Including Planning, Scheduling, and Project Controls
    • Quality Control Inspection and Testing Services
    • Quality Assurance Program Development for New and Rehabilitation Construction
    • Quality Assurance Program Auditing and Oversight Services
  • Training Services
    • Alloy Selection for Corrosive Environments
    • Solving Corrosion and Materials Problems for Plant Engineers
    • Welding Essentials for Plant Engineers
    • Brick and Tile-Lined Equipment Inspection and Repair
    • FRP Essentials for Pulp and Paper Mills
    • Concrete Restoration and Protection
    • Quality Assurance for Capital Projects

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