Fresno sits at 308 feet above sea level, but its water table can swing over 30 feet between drought years and wet cycles. Every excavation, retention basin, and foundation drain in the Central Valley depends on one thing: reliable field permeability data. Without it, dewatering plans fail and recharge basins clog. We run Lefranc tests in granular alluvium and Lugeon tests in deeper fractured zones, giving you real K-values instead of lab estimates. The 2023 recharge season proved how critical this is—basins designed without in-situ data lost capacity fast. Our team brings the equipment directly to your site, whether it's a downtown infill project or an agricultural processing facility near Highway 99.
For deep foundation planning in variable soils, we often pair permeability data with SPT drilling to correlate hydraulic conductivity with blow counts across the stratigraphy. This avoids the mistake of assuming uniform drainage where interbedded clays create perched water.
A single Lefranc test at the right depth replaces a dozen lab permeability estimates and eliminates the risk of designing dewatering for the wrong soil layer.
