|Contract Value||$500k - $2M|
|GWTT Role||Dewatering Subcontractor|
This 13-month dewatering project required excavation to depths of 20’ below ground surface within very complex soils, including fractured shale and varved clay lenses.
A 2,500 LF Drilled Wellpoint Dewatering System was installed with segments being elevated up to 5’ above grade, and trenched up to 4’ below grade to maintain the required consistent system elevation across the massive site.
A GWTT 600 CFM Vac Station was utilized in conjunction with two GWTT Vac-fed 150 GPM Sub-Pump Cans, which enabled the deep drawdown of groundwater within the dense fractured-shale soils. Early higher volumes of water were replaced by high volumes of air and low volumes of water during the project while maintaining the depressed groundwater state across the site, which included areas of over 600’ between system legs. The proprietary GWTT equipment was able to perform effectively in both environments without losses during the transition.
The project also required in-situ treatment of the groundwater prior to discharge. Successful dewatering and treatment allowed for excavation and civil work to occur per plan and
Additionally, due to property design changes, the project was paused for four months during the winter season, which caused 19’ of water to fill the excavation (see gallery). The system was re-started in March of the following year and successfully reestablished a dry subgrade for the completion of the work.
We Can Help Solve Your Dewatering Challenges
Dewatering is a core competency within GWTT’s total water management solutions portfolio. We design, build, troubleshoot, upgrade, install, and operate dewatering equipment and treatment systems for civil projects and environmental applications. These systems include but are not limited to: drilled vertical and battered wellpoints, jetted wellpoints, gravity- and vacuum-assisted deep wells, design sump and groundwater control excavation plans, groundwater depression and management, dewatering for contaminants remediation, coal ash pond / CCR decanting, ejector systems, and temporary and permanent artesian pressure relief systems, among others.