ISCO Projects

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 failed to remove SPH at the site. 

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 ISCO-EFR^® processes are the combination of surfactant and oxidant injection, respectively, with dual-phase/multi-phase extraction.  The processes described herein are patent-protected and represent the intellectual property of EcoVac Services, Inc.

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^® reduced BTEX concentrations to well below the site’s CALs (four field days).  A percent reduction in BTEX concentrations was achieved by ISCO-EFR^®.

Table 1: ISCO-EFR^® Results