Casestudy 2

Background


Gasoline  SPH has been historically present in three monitor wells for a number of years.  Three  mobile  dual-phase extraction events conducted by another provider fail

Hydrogeology

Groundwater is present in  silty clay at depths ranging from approximately  3 to  7 feet below grade

Treatment Methodology
EcoVac Services was contacted to implement SURFAC®and ISCO-EFR® at this site to remove SPH and reduce BTEX concentrations below the site’s CALs.  EcoVac Services’  patented  SURFAC®and ISCOEFR® processes are the combination of surfactant and oxidant injection, respectively, with dual phase/multi-phase extraction.   The processes described herein  are  patentprotected and represent the intellectual property of EcoVac Services, Inced to remove SPH at the site.




SURFAC® and ISCO-EFR® Implementation
A single SURFAC® application was implemented at the site in September and October 2007 (four field days)  to remove SPH from three monitor wells. ISCO-EFR® was implemented in July 2008 and October 2009  (a total of four field days)  to reduce BTEX concentrations in four monitor wells to below CALs




Results and Conclusions
A single  SURFAC® application successfully removed SPH from this site (four field days). ISCO-EFR® was implemented using Activated Sodium Persulfate which  reduced BTEX concentrations to well below the site’s CALs (four field days).  A table showing the reduction in BTEX  concentrations achieved by ISCO-EFR® is shown below