Commercial Subsurface Consulting

Reduce uncertainty. Mitigate exposure. Build with confidence.

Tunnell Subsurface Consulting supports contractors, developers, and project teams with practical, defensible insight on groundwater and subsurface conditions that affect excavation, dewatering, stability, and site performance.

From pre-bid evaluation through construction, field response, and project documentation, TSC provides field-informed analysis, clear documentation, and well-supported recommendations when conditions don’t match expectations.

Contractor & Project Support 

Practical support for groundwater, subsurface conditions, and project decisions—before, during, and after construction. 

• Groundwater and subsurface evaluation
  Hydrogeologic condition analysis and conceptual site understanding tied to field conditions and project risk.

• Dewatering and excavation support
  Evaluation of groundwater conditions affecting excavation, dewatering feasibility, and construction performance.

• Subsurface risk screening
  Site-focused review for development and redevelopment projects, with attention to constructability, water management, and underground uncertainty.

• Technical due diligence and document review
  Review of geotechnical, environmental, remedial, and related third-party materials to identify gaps, risks, and practical next steps.

• Groundwater control and bypass planning support
  Practical support from concept review through field implementation when groundwater must be managed to keep work moving.

• Regulatory and compliance-oriented support
  Documentation and planning support where permits, specifications, public requirements, or agency expectations affect the work.

• Field documentation and response support
  Clear notes, written support, and issue framing when site conditions need to be explained, documented, or responded to during a project.

How TSC Works on Site

Every site is different. TSC starts with evaluation—not assumptions.

We begin with an initial evaluation of site conditions, available information, and project constraints. From there, we provide clear findings and recommendations based on what is known and what still needs to be confirmed.

If conditions require it, we may recommend targeted intrusive investigation—such as test pits, probing, or field verification—to confirm subsurface conditions and support construction decisions.

All work is structured to reduce uncertainty, clarify next steps, and provide well-supported, defensible conclusions before conditions impact performance, cost, or schedule.

Technical, Documentation, and Claims Support 

• Technical review of plans, specifications, and work documents
  Evaluation of how project requirements align with actual site and groundwater conditions.

• Site condition and documentation analysis
  Review of field conditions, reports, and project records to clarify what is occurring and why.

• Support for RFIs, change orders, and project responses
  Clear, well-supported input when conditions differ from plans or require formal response.

• Groundwater and subsurface issue framing
  Identification and explanation of conditions affecting excavation, performance, or compliance.

• Claims, dispute, and expert support
  Technical support, documentation review, and opinion development when issues escalate or are challenged.

• Experience with NPDES permitting, monitoring, and reporting requirements

Ability to evaluate groundwater and dewatering conditions in the context of discharge compliance, site constraints, and project documentation. 

Our work is designed to guide decisions in the field—and to stand up under scrutiny if challenged.