Beale Air force Base, Capehart Service Station, Marysville, CA
Leaking Underground Storage Tank, Fractured Bedrock Analysis, Remediation Services.
Support facilities to maintain the mission at Beale AFB have required them to store and use various fuels and chemicals. At the Capehart Service Station, several USTís were removed and found to have leaked petroleum hydrocarbons containing high levels of MTBE into the surrounding subsurface.
The site is located in the foothills of the Sierra Nevada Mountain Range, and dense steeply dipping fractured bedrock was found to have provided complex pathways for the migration of contaminants. H&A evaluated the site geology and formulated a site-specific approach to investigate this migration in two phases:
Groundwater Remediation System
Following the initial site investigation, H&A designed and installed a groundwater extraction and treatment system to remediate perched groundwater located within the former UST pit. Two extraction wells were fitted with Grunfos RediFlow 3 submersible pumps that remove contaminants into two 1000-pound Granular Activated Carbon canisters and a 200-pound fine-grained carbon canister which discharge treated groundwater to the sanitary sewer system. H&Aís quick design and implementation of the groundwater remediation system allowed Beale AFB to meet all regulatory requirements while maintaining the ongoing Base mission without imposed fines or notices of violation.