PFAS Removal Consulting

The Challenge
Maverik, Inc. needed to manage and treat PFAS contaminated dewatered groundwater. The dewatering process associated with underground storage tank (UST) installation at the site expected to produce approximately 100,000 gallons of water. However, due to the proximity to a creek and wet weather, the dewatering produced approximately 500,000 gallons of water. The receiving wastewater treatment plant requested to remove all PFAS to non-detectable levels following Colorado PFAS Policy 20-1 prior to discharging at the sewer. 

ERG’s Solution

ERG provided consulting services and designed and implemented the PFAS removal system. PFAS was removed from approximately 500,000-gallons of groundwater and no PFAS was detected above the laboratory method detection limit in the samples collected at 25,000 gallons intervals. ERG designed the system to be able to run at 80 gallons per minute capacity while providing necessary empty bed contact time due to various site unknowns.

The conservative design approach saved more than $200,000 due to the elimination of offsite discharge. The treatment change included a weir tank to remove sediment, particle filtration and two vessels filled with appropriate volume of granular activated carbon (GAC). ERG used several indicators including the clarity of the effluent via the weir tank and bag filters as indicators of the complete removal of PFAS.

Client Results:

• More than $200,000 in savings based on ERGs approach

• 500,000 gallons of groundwater treated to remove PFAS

 SERVICES PROVIDED

Water Quality Evaluation

Pretreatment System Design, Implementation, and Monitoring

Reporting