Lawton, Oklahoma

Background

EcoVac Services was retained to reduce dissolved benzene levels at the subject site after a surfactant remediation firm, who guaranteed removal of free product and reduction of benzene levels to below the SSTL (at a cost of $440,982), failed to sufficiently reduce benzene levels and subsequently abandoned the project.

Dissolved benzene concentrations were 243% greater than SSTLs with a plume size of ~12,500 ft² when EcoVac Services was retained.  EcoVac Services reduced dissolved benzene to well below SSTLs (an average 82% reduction) and successfully closed the site at a guaranteed cost of $163,500, completing the project within 42 field days.

EcoVac Services initially implemented its EFR^® (mobile dual-phase/multi-phase extraction) process during 22 field days followed by 14 field days of its patented ISCO-EFR^® process (in-situ chemical oxidation combined with dual-phase/multi-phase extraction). Three additional 2-day ISCO-EFR^® events were completed. The existing well network was utilized, eliminating the expense of additional treatment wells.

Geology/Hydrogeology

Lithology is highly variable, consisting of clay and silty clay in the smear zone. Groundwater is present at approx. 10 to 12 feet bgs.

Results and Conclusions

EcoVac Services was contracted to complete the remediation project abandoned by the prior surfactant remediation contractor, implementing EFR^® and ISCO-EFR^® over the course of 42 field days.

Dissolved benzene was reduced an average of 82% to well below SSTL over the course of 42 field days at a cost of $163,500 (guaranteed cleanup contract). SITE CLOSURE WAS ATTAINED.