Remediation Technology Summit


Robert Roth
Robert Roth

Sr. Engineer
Terracon

Mr. Roth has been a civil/environmental engineer for 34+ years specializing in soil and groundwater remediation, wastewater treatment, landfill remediation, and vapor mitigation system design. He has managed the design, construction, and operations of 40+ soil and groundwater remediation projects for industrial and commercial clients with costs ranging from $25K to $12M. EPA innovative technologies he has implemented include SVE, air sparging, dual phase extraction, multi-phase extraction, groundwater pump and treat, ISCO, bioventing, biosparging, methane mitigation, and vapor intrusion mitigation. Mr. Roth has a BS in civil engineering, and MS and PhD in environmental science, all from Rutgers University.

POSTER PRESENTATION

Pilot Testing, Design, Installation, and Operation of an Active Sub-Slab Vapor Mitigation System to Address PCE Issues at a Former Dry Cleaning Facility in Denver, Colorado

Environmental investigations at a former dry cleaning facility showed tetrachloroethylene (PCE) in sub-slab soil with concentrations up to 5,510 ug/m3 which exceeds the EPA vapor intrusion screening level (VISL). Terracon conducted a pilot test in the area where the former dry cleaning machine was located. The pilot test used one suction point and six sub-slab vacuum monitoring points (VMPs). The pilot test data were used to estimate the radius of influence (ROI) and a vacuum blower was then sized to affect an ROI needed to address the area of concern. A full-scale VMS was then designed and installed. Monitoring data show that the VMS has extracted the VOCs from beneath the slab to concentrations of PCE two orders of magnitude below the VISL. This enabled the owner to obtain closure of the site with the regulatory agency.


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