During the Harris County Toll Road construction of a new overpass, crews encountered an unexpected challenge. Contaminated soils were discovered while drilling foundation piers for the bridge. Because the source of the contamination wasn’t immediately clear, additional investigation was needed. This ensured the project could move forward safely and on schedule.

Identifying the Source of Impacted Soil

Our team at CRG Texas Environmental Services was called in to perform a detailed subsurface assessment. Through multiple iterations of Phase II Environmental Site Assessment (ESA) sampling and laboratory chemical analysis, we identified the areas of concern (AOCs). The contamination was linked to a release from a high volatile liquid product (HVLP) pipeline. This required precise mapping of impacted soils across the right of way, pipeline easement, and construction area. The Harris County Toll Road construction project required careful handling of these impacted soils.

Innovative Soil Screening and Sampling

To streamline the cleanup process, CRG Texas implemented a grid-based system to evaluate each three-foot soil cut within the AOCs. Using a photo-ionization detector (PID), our team screened soils for volatile organic compounds (VOCs) during the Harris County Toll Road construction. We then installed soil borings within each grid, which allowed us to:

• Expedite the screening and sampling process

• Excavate and load impacted soils directly into trucks

• Transport contaminated material straight to the landfill for disposal

This approach made it possible to separate impacted soil from clean soil efficiently. Impacted material was further verified through laboratory analysis, profiled for offsite disposal, and then manifested and transported to an approved landfill.

CRG Texas’ Role in Project Success

CRG Texas managed every stage of the environmental response during the Harris County Toll Road construction, including:

• Screening and sampling of soils

• Rapid turnaround laboratory analysis

• Data review and regulatory reporting

• Waste profiling, transportation, and disposal

By coordinating closely with contractors and working alongside heavy equipment already on site, our team minimized downtime. We also kept construction schedules on track.

Results That Saved Time and Money

Thanks to our creative approach and deep construction experience, CRG Texas helped the Client avoid costly delays and kept the project moving forward. The Harris County Toll Road construction team and stakeholders praised our ability to combine environmental expertise with practical field solutions, reinforcing CRG Texas as a trusted partner in complex construction projects.

A Team Effort

We extend our gratitude to our dedicated staff, the analytical laboratory, and our Client for making this project a success. At CRG Texas, we’re proud to deliver solutions that protect the environment. We also support the progress of Harris County Toll Road construction and Texas infrastructure.