A Thompson Engineering client entered into an agreement with the Alabama Department of Environmental Management (ADEM) to perform remedial action at a property where cyanide was identified as a contaminant concern. Remedial action includes the evaluation, removal, treatment, disposal, and/or on-site management of contaminated materials.
Thompson Engineering performed multiple projects at the site. Initially, groundwater monitoring wells were installed and soil and groundwater samples were collected. A neutral sump release investigation report was developed that defined the horizontal and vertical extent of the presence of cyanide in soil and groundwater.
Our client and ADEM agreed that a Corrective Measures Implementation Plan (CMIP) would be developed. A Bench Scale Treatability Study was performed and we advised using in-situ chemical injection of base activated persulfate. The CMIP was developed by Thompson and was approved by ADEM with notice to proceed for implementation of the corrective measures identified.
Thompson prepared an Underground Injection Control (UIC) Class V Well Permit Application on behalf of our client. Remediation was implemented by injecting a point nozzle using a direct push rig through a floor slab and injecting 68,000 gallons of activated sodium persulfate. Baseline (soil and groundwater) monitoring, injection monitoring, soil excavation, air monitoring, groundwater monitoring (20 monitoring wells), and post-injection monitoring was performed. Quarterly and semi-annual monitoring continued for several years. Well abandonment will be performed when post monitoring indicates that groundwater target goals have been met.
client
CONFIDENTIAL CLIENT
location
ALABAMA
market
INDUSTRIAL
Service Specialties
- CIVIL
- GEOTECHNICAL
- SURVEYING
- COMPLIANCE
- ASSESSMENTS & INVESTIGATIONS
- ENVIRONMENTAL ENGINEERING
- DRILLING
