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Alameda Point NAS
Oakland, CA

 


Client:

Tetra Tech EMI, Inc.
Equipment near the east side of
Building 5, U.S. Navy Alameda Point
    

Surbec Environmental, L.L.C. provided site investigation that included over 20 geo probe wells and 15 groundwater wells east of building 5 at a depth ranging from 13 - 17 feet deep.

A treatability study was conducted to evaluate surfactant enhanced recovery of halogenated solvents (TCA + TCE + DCE + DCA).

Conceptual and pilot-scale designs of the surfactant injection and recovery system, which included site visits, predesign analysis, Modflow analysis, tracer test analysis, surfactant selection and optimization, surfactant recovery design, fate transport analysis, project management and project coordination, were completed prior to on-site operations.

The process diagram is shown below.

 

 TASKS

 
  • Discovered and delineated DNAPL plume that consisted primarily of TCA and TCE.
  • Attained 97% DNAPL removal (TCE and TCA), and showed a 50% - 80% reduction in groundwater concentrations within the test area.
  • Implemented integrated Surfactant Enhanced Subsurface Remediation process, including surfactant recycling and reuse.
  • Effectively operated the MPP liquid extraction system AKZO NOBEL for TCE and TCA removal from recovered surfactant, with removal efficiencies of over 85%.
  • Effectively operated the Micellar Enhanced Ultrafiltration for surfactant stream concentration.