THe trinity subsurface blog

Water and gas pipe, electric and telecom cable, sewers, tanks and voids. What GPR detects through soil, asphalt and concrete, and what limits it.

The eastern US sees 40 to 60 inches of rain a year, and it all has to go somewhere. Why storm system maintenance is a community-wide concern.

Two 36-inch pipes, 150 feet each, packed solid with mud, rock and concrete runoff. How Trinity's crew cleared them and restored flow.

Quality Level D through A under ASCE 38: what each level of subsurface utility data actually means, how it is collected, and when each one is enough.

A CCTV inspection is only as useful as its report. How Trinity scopes an inspection and documents defects, blockages and cross bores for the record.

Sinkholes form where water hollows out the ground beneath a site. What causes them, the warning signs at the surface, and how voids are found early.

A cross bore is one utility installed straight through another, usually a sewer. Why it goes unnoticed for years, and how it is found before a cleanout.

Unexploded ordnance turns up on former ranges and Civil War ground long after the fighting. The risk it carries, and how geophysical survey finds potentially dangerous objects under the surface.

Concrete analysis assesses the strength, thickness and condition of a slab. What it measures, and why it matters before cutting or loading.