Staged drums for containerizing well purge water at chlorinated solvent-contaminated site in Baltimore, MD.
Southern shoreline of PCB-contaminated site in Baltimore, MD.
Drilling groundwater monitoring wells at industrial site in Baltimore, MD.
Performing characterization of liquids for waste characterization and disposal.
Staged drums for containerizing well purge water at chlorinated solvent-contaminated site in Baltimore, MD.
Chesapeake GeoSciences, Inc.(CGS) environmental consulting office in Columbia, MD.
Chesapeake GeoSciences, Inc.(CGS) environmental consulting office in Columbia, MD.
Washington Metropolitan Area Transit Authority 
Southeast Bus Garage 
Washington, D.C.

Petroleum releases resulting from underground storage tanks (USTs) at a bus maintenance garage since the 1930s resulted in a groundwater contamination plume that covered two city blocks. CGS installed a subsurface remediation system utilizing 20 recovery wells in the impacted area. CGS successfully completed all of the remediation system construction (including excavation in private and public spaces) while avoiding disruptions to the operational facility. Several hundred feet of underground piping were installed and pressure tested as part of the project.

Heavy-duty, traffic rated recovery well vaults and piping transition vaults were installed in roadways, parking areas, and landscaped areas during the course of construction. The recovery wells were equipped with pneumatic top-loading pumps. Recovery wells were simultaneously utilized for soil vapor extraction (SVE) via a regenerative blower. The water treatment system consisted of an oil/water separator, low-profile air stripper, iron removal filtration system, bag filter, and liquid-phase granular activated carbon (GAC) filtration (vapor-phase GAC was used to treat air stripper emissions). Air emissions from the SVE system were treated using a thermal oxidizer. All of the equipment and electrical wiring installed within the remediation system enclosure was explosion-proof.

CGS also coordinated the new electrical and natural gas utility connections for the remediation system. The automated system controls included many fail-safe alarms controlled by a central programmable logic controller (PLC) equipped with an auto-dialer that enabled remote monitoring of system operation. CGS worked closely with the system design engineer to modify the design of this large remediation system during the construction in order to optimize its operation and efficiency. 
 
Installation of heavy-duty recovery well vaults at petroleum contaminated site in Washington, DC.
Installation of Recovery
Well Vaults		 Preparation for pouring floor slab inside petroleum remediation building at site in Washington, DC.
Installation of Underground Remediation System Piping
Installation of underground product and vapor recovery lines for remediation system at petroleum-contaminated site in Washington, DC.
Construction of Building for
Remediation System
Interior of groundwater and soil remediation building at petroleum-contaminated remediation site in Washington, DC.
Completed Groundwater and Soil Remediation System

ADDITIONAL PROJECT SUMMARIES:

- Manufactured Gas Plant Remediation – Easton, MD
- PCB Remediation – Baltimore, MD
- PCB Remediation – Beltsville, MD
- Petroleum Remediation – Washington, DC
- Voluntary Cleanup Program – Bethesda, MD
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