When Christenson Electric needed excavation and trenching services for the Multnomah County B425 electrical infrastructure project, they turned to Angelo Underground for precision work in a sensitive, active government facility. The project required careful coordination, strict compliance with municipal inspection standards, and the ability to adapt when field conditions demanded quick decision-making.
The Challenge
The B425 facility project presented several demanding requirements that would test any excavation contractor’s capabilities. Christenson Electric needed underground electrical conduits installed at an active county building where operations couldn’t be interrupted. The work involved multiple phases, including trenching for electrical lines, installation of a generator pad foundation, and light pole base work—all while maintaining strict safety protocols and meeting rigorous municipal inspection standards.
The site’s active status meant that every phase of excavation, forming, and concrete work had to be coordinated precisely with the electrical installation schedule. Any delays or quality issues could impact county operations and push the project timeline beyond its five-month window.
Key challenges included:
- Excavating around existing utilities in congested zones where live lines require careful exposure
- Meeting strict municipal inspection requirements with zero margin for error
- Coordinating multiple work phases, including excavation, concrete work, and electrical installation
- Maintaining safety protocols at an active government facility
- Ensuring all concrete work met engineering specifications and passed testing on the first review
The Solution
Angelo Underground’s team approached the project with a systematic plan that emphasized precision, communication, and adaptability. The work began with careful hydrovac excavation in areas where utilities were congested or where safe exposure of live lines was required. This non-destructive method ensured that existing infrastructure remained undamaged while creating safe access for new conduit placement.
The excavation work progressed through multiple zones at the facility, with trenches excavated to depths of 3-6 feet over approximately 100 feet of linear trenching. Each phase was coordinated directly with Christenson Electric’s installation schedule to avoid any downtime. Traffic control and surface restoration planning were built into every trench closure to maintain site access throughout the project.
For the generator pad foundation, the team handled all aspects from initial excavation through subgrade preparation, compaction testing, and final concrete placement. Working with Carlson Testing and structural engineers, they ensured every step met the 4,000 psi design strength requirements and complied with ASTM standards for concrete testing and compaction verification.
The approach emphasized:
- Proactive communication with the general contractor and design teams
- Quick onboarding of testing partners to maintain schedule integrity
- Experienced field leadership that understood municipal inspection requirements
- Careful phasing to keep electrical installation work moving forward
- Complete documentation for all testing and inspection records
Managing Field Challenges
During the concrete pour for the generator pad, the team encountered an unexpected obstacle when the initial concrete load didn’t meet specifications. Testing couldn’t begin immediately, which meant the first load had to be rejected. This created a brief hold in the pour sequence that could have impacted the project timeline.
Rather than rushing forward with questionable material, the field crew paused the pour and immediately communicated the issue to all stakeholders. They waited for the next concrete load to arrive, had it properly tested and confirmed to specifications, and then proceeded with the generator pad pour. This real-time problem-solving ensured that all concrete placed met strength and quality requirements while keeping the overall project on track.
The quick, organized response demonstrated the crew’s ability to make sound decisions under pressure. By maintaining direct communication among the contractor, general contractor, and testing firm, they turned a potential setback into a demonstration of quality control and professional project management.
Why Experience Mattered
This project required more than just excavation equipment and basic concrete knowledge. Success depended on understanding municipal inspection processes, coordinating multiple trades and testing agencies, and maintaining strict quality control at an active government facility.
The team’s experience showed in several key areas:
- Regulatory expertise: Understanding city permit requirements and inspection protocols ensured every phase passed review on first submission
- Testing coordination: Quick onboarding of Carlson Testing and coordination with structural engineers kept the schedule moving despite the concrete issue
- Field leadership: Owner Michael Martin’s hands-on involvement ensured safe excavation and precision forming under tight inspection schedules
- Quality focus: The decision to reject substandard concrete demonstrated commitment to long-term project success over short-term convenience
- Communication systems: Daily Raken logs and direct coordination channels kept all stakeholders informed throughout the project
Project Results
The completed work met every engineering and safety requirement while maintaining the project’s five-month timeline. The generator pad foundation exceeded its design strength specifications, and both county and city inspectors approved all test results with no corrective actions required.
Key outcomes included:
- Zero safety incidents recorded across all excavation, forming, pouring, and testing phases
- All compaction and subgrade testing passed on first review
- Concrete testing confirmed the pad exceeded 4,000 psi design strength requirements
- Every inspection passed without delays or corrective work needed
- Complete testing and inspection documentation provided for project closeout
- Full compliance with ASTM C39/C172/C31 and D6938 standards
The finished foundation now provides a reliable, code-compliant base for the generator and electrical equipment serving the Multnomah County B425 facility. Christenson Electric was able to continue its electrical installation work without interruption, and county operations remained unaffected throughout the construction process.
The client’s satisfaction with the work was evident in their decision to hire Angelo Underground for additional projects, confirming the value of professional excavation services that prioritize quality, communication, and regulatory compliance.
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