Geotechnical Soil Borings — Parvin Rd, Prosper TX

Project Overview

IET completed a geotechnical soil boring program at Parvin Road in Prosper, Texas for UES (Project #G261346). The work involved 40 boreholes drilled to 20 feet, totaling 400 linear feet of soil investigation. The program was managed by PM Blain Lehman with sales support from Brad Eskue.

This project reflects IET's growing presence in the Dallas–Fort Worth metropolitan area, providing fast-mobilization geotechnical drilling services to support engineering and environmental investigations across the rapidly developing North Texas region.

Scope of Work

• Forty (40) soil borings drilled to 20 feet depth
• 400 total linear feet of soil boring completed
• Single mobilization for full 40-boring program
• Project #G261346 for UES (Fort Worth, TX office)
• Completed over 15-day field program (May 5–19, 2026)

Project Details

Technical Approach & Methodology

Geotechnical soil borings are the foundational investigation method for characterizing subsurface conditions prior to construction, infrastructure development, or environmental assessment. The process involves advancing hollow-stem augers or rotary drill string to a target depth, collecting representative soil samples at standard intervals (typically 5-foot centers), and performing Standard Penetration Test (SPT) resistance measurements to quantify soil density and strength.

For the Parvin Road project in Prosper, Texas, IET deployed a single drilling rig to advance 40 borings to 20 feet below ground surface. Each boring was logged continuously by a field geologist, with soil samples collected using a 2-inch O.D. split-spoon sampler driven by a 140-pound automatic hammer falling 30 inches per blow (ASTM D1586). SPT N-values were recorded at 5-foot intervals, providing the geotechnical engineer with the data needed to calculate bearing capacity, settlement potential, and foundation design parameters for the planned development.

The 400 total linear feet of boring completed over a 15-day field program reflects IET's capacity for high-production geotechnical drilling programs. Single-mobilization execution of all 40 borings ensured consistency in sampling methodology, field logging, and equipment calibration across the entire site — a quality advantage over multi-mobilization approaches that can introduce data variability between field events.

Site Geology & Hydrogeological Context

Prosper, Texas is located in Collin County within the Blackland Prairie region of North Texas. The shallow subsurface geology consists of Quaternary-age alluvial and colluvial deposits overlying the Cretaceous-age Austin Chalk and Eagle Ford Shale formations. Soils in this area are predominantly Houston Black clay and similar vertisols — high-plasticity clays with significant shrink-swell behavior that directly impacts foundation design and construction planning.

The 20-foot boring depth on this project is typical for shallow foundation investigations in the DFW Metroplex, where the primary geotechnical concerns are expansive clay behavior, potential settlement, and bearing capacity of near-surface soils. The rapid development of Prosper and surrounding communities in the US-380 corridor has created strong demand for fast-turnaround geotechnical drilling programs like this one, supporting residential, commercial, and infrastructure construction projects across the region.