Built for
Overflow Control
Combined Sewer Overflow facilities reduce overflow events into rivers and waterways during heavy rain. We handle the deep excavation, diversion chambers, and large underground structures these projects require.
Cast-in-place and precast diversion chamber construction with complex piping tie-ins.
Engineered shoring and dewatering for large underground CSO structures.
Outfall and discharge structures built to reduce overflow into rivers and waterways.
Complex utility relocation and protection through congested urban corridors.
Storm and sanitary separation work performed alongside CSO structure construction.
Permit, inspection, and as-built submittals aligned with municipal and authority requirements.
The Field
Protocol
CSO work sequences shoring, excavation, structure construction, and utility tie-in. Every phase is planned around the live utility corridor above it.
Utility locates, soil review, and adjacent-structure survey.
Engineered shoring installed, then phased excavation to structure subgrade.
Diversion chamber, outfall, or underground structure built to design.
Connection to the existing combined system, testing, and backfill.
Where We
Get Called In
Municipal CSO separation and diversion projects in dense urban corridors, coordinated with authority and state clients.
Municipal combined sewer separation contracts reducing overflow events.
New diversion chambers directing flow away from waterways during storm events.
Outfall reconstruction and discharge point improvements.
CSO construction in dense, utility-congested downtown environments.
Connections between CSO structures and existing interceptor sewers.
Work performed to help municipalities meet state environmental mandates.
Equipment &
Safety
CSO excavations are engineered and shored to the same standard we apply on every deep underground structure.
Diversion chamber and outfall construction is sequenced to keep the existing combined system operational until the new structure is tied in.
We provide certificates of insurance, bonding documentation, and prequalification packages to any GC or owner on request.
Ready to
Scope a CSO Project?
Send us the plans and structure details. We will return a preliminary scope and schedule assessment.