Tunnel construction project requiring 35 ft. deep excavation, depressurization, and dewatering of underlying soils.
SLC AIRPORT CENTRAL TUNNEL
SALT LAKE CITY, UTAH
THE CHALLENGE
A deep 35 ft. excavation with sheet pile shoring was required for this project. Highly stratified soils and underlying alluvium caused difficult dewatering conditions. Unstable soils near the planned excavation depth further complicated the tunnel construction. Water treatment for hydrocarbon contamination was also required for several wells.
THE SOLUTION
Griffin designed and installed a deep well dewatering system to target the coarse alluvium from 45 ft. to 85 ft. below grade. Large diameter wells were drilled and completed to 85 ft. below grade to depressurize the formation below the tunnel excavation. The dewatering system produced approximately 550 GPM and the depressurization of the formation provided a successful project with limited sumping. Temporary water treatment was required to remove hydrocarbon contaminants from the effluent of several wells. Griffin also designed and installed the temporary treatment system for this project.
2023 TDI DEWATERING CONTRACTOR OF THE YEAR FINALIST
Client
R.L. Wadsworth
OWNER
Silverstrand Construction
REVENUE
$1,000,000
TIME
2021-2022
GRIFFIN DIFFERENCE
Griffin’s design to depressurize the underlying alluvium formation performed very well and helped the contractor maintain an aggressive project schedule. Griffin provided a turn-key solution and completed all dewatering permitting, design, submittal, and installation. Griffin’s deep well system design was optimized for the difficult dewatering conditions at the site. Large diameter wells were drilled up to 50 ft. below the excavation depth to depressurize the underlying soils and pump high volumes of water.
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