Remediation Status: In groundwater monitoring

Why the technology was selected:
High concentrations in soil along the footing of the building complicated excavation. Injection was the best application technology for the location of contamination.

Date implemented:
2009, April

Final remediation design:
2,800 pounds of EHC by Adventus, micron sized zero valent iron and carbon mixed water and injected into the soil source area and in the vicinity of the highest groundwater contamination outside of the soil contamination. 15 points spaced 12 feet apart. 49 gallons/point at 3-4 gpm < 300 PSI. Treatment zone from 20 to 6 feet bgs bottom-up at 1 foot intervals.

Results to date:
2011, May Monitoring well SA1 is located outside of the soil source contamination. [PCE] dropped from 8 ppm to 0.0713 ppm. Daughter products increased minimally. Monitoring well SA2 is located in the area of highest soil contamination. [PCE] went from 25 ppm down to 7 ppm in 1 year with significant increase in daughter products. 1 year later and [PCE] has bounced back to 22 ppm but daughter products concentrations have continued to decrease.

Next Steps:
Continued monitoring of contamination for stability. Possible application of vapor extraction to remove soil contamination.

Cost to Design and Implement:
$32,000 EHC $2.25/pound, $6,300 total Injection $10,291

Why the technology was selected:
High concentrations in soil along the footing of the building complicated excavation. Injection was the best application technology for the location of contamination.

Date implemented:
2009, April

Final remediation design:
2,800 pounds of EHC by Adventus, micron sized zero valent iron and carbon mixed water and injected into the soil source area and in the vicinity of the highest groundwater contamination outside of the soil contamination. 15 points spaced 12 feet apart. 49 gallons/point at 3-4 gpm < 300 PSI. Treatment zone from 20 to 6 feet bgs bottom-up at 1 foot intervals.

Results to date:
2011, May Monitoring well SA1 is located outside of the soil source contamination. [PCE] dropped from 8 ppm to 0.0713 ppm. Daughter products increased minimally. Monitoring well SA2 is located in the area of highest soil contamination. [PCE] went from 25 ppm down to 7 ppm in 1 year with significant increase in daughter products. 1 year later and [PCE] has bounced back to 22 ppm but daughter products concentrations have continued to decrease.

Next Steps:
Continued monitoring of contamination for stability. Possible application of vapor extraction to remove soil contamination.

Cost to Design and Implement:
$32,000 EHC $2.25/pound, $6,300 total Injection $10,291