Groundwater Treatment for New Underground Storage Tank (UST) Installation

MWT 3K4 treatment trailer with lead/lag GAC filtration

Three LPV-5000 media vessels with TS8X30CPR reactivated carbon

BF-6 bag filter skid for solids removal

Float-controlled treatment pump for 24/7 automated operation

Trash pump with automatic low/high flow settings

Customer-provided frac tank for initial water collection

Wellpoint dewatering system (by Mersino) for sediment control

To support the installation of a new underground storage tank (UST) at a former gas station site, Global Environmental was retained by Oscar Larson to provide a full-service groundwater treatment solution. Although the site’s past UST releases had been closed, residual contamination remained in the groundwater, necessitating treatment before discharge.

Global managed the project from system design through startup, coordinating with the Michigan Department of Environment, Great Lakes, and Energy (EGLE) to secure a temporary National Pollutant Discharge Elimination System (NPDES) permit. A wellpoint dewatering system installed by Mersino enabled effective drawdown in the excavation area while minimizing turbidity upstream of the treatment system.

The treatment setup included a standard MWT-3K4 Wastewater Treatment Trailer equipped with bag filters and three LPV-5000 media vessels containing TS8X30CPR reactivated granular activated carbon. A float-controlled pump automatically transferred water from a customer-provided frac tank into the system, enabling unattended 24/7 operation throughout the excavation phase. Global also deployed a trash pump with automatic high- and low-flow controls to accommodate fluctuating flow rates.

In addition to permitting and system installation, Global completed compliance sampling and reporting as required by EGLE. The system remained in operation until excavation and dewatering activities were complete, successfully treating groundwater to meet regulatory discharge limits.