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Installation Oversight For Dual Phase Vapor Extraction System

Site Assessment and Remediation of Chlorinated Solvents

Project Highlights:
  • Conducted rapid investigation and response time for real estate transaction
  • Perform enhanced and expanded Phase I Environmental Site Assessment
  • Drilled soil borings at locations identified as Recognized Environmental Concerns (RECs) to evaluate potential releases of chlorinated solvents
  • Performed soil gas survey and additional assessments to define extent of chlorinated solvents in the subsurface
  • Installed 18 vapor extraction wells within three defined lithologic zones
  • Designed, engineered, and installed a soil vapor extraction (SVE) system
  • Achieved regulatory site closure within 9 months

EEC Environmental (EEC) was hired to perform a Phase I Environmental Site Assessment (ESA) at a property where the client was terminating a long-term lease. One portion of the facility was utilized for the application of a chlorinated solvent-based adhesive. Although no evidence of spills or leaks was observed during the Phase I ESA, EEC’s considerable experience with solvents at similar manufacturing settings has shown that these solvents often impact the subsurface environment even when no obvious conduit or other mechanisms for dispersal of the solvents is visible. Therefore, EEC recommended a limited Phase II subsurface investigation to determine if soil beneath the adhesive coating area had been impacted by solvents. Results of the limited Phase II investigation indicated the presence of elevated concentrations of tetrachloroethene (PCE) in the soil beneath the suspect area.

Delineation of the PCE-impacted soil was performed using a soil gas survey and by drilling additional soil borings. Once the plume and the site lithology had been defined, EEC designed and installed nested vapor extraction wells. EEC also designed and installed a vapor extraction unit using carbon adsorption pollution control technology. In addition, the client required a rapid investigation and remediation implementation in order to allow the leased property to be returned to the property owner by the lease expiration. All Phase II investigations, remediation design, construction, and startup were performed in less than one month.


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