Drycleaner Site Profiles

US Marine Corps, North Carolina

Description
Historical activity that resulted in contamination.

Site groundwater was impacted by CVOCs beneath two highly sensitive military buildings.

Remediation Status: In groundwater monitoring


Contaminants
Contaminants present and the highest amount detected in both soil and groundwater.


Contaminant Media Concentration (ppb) Nondetect
1,1,1-Trichloroethane groundwater
Trichloroethene (TCE) groundwater
1,2-Dichloroethene groundwater

Site Hydrology

Deepest Significant Groundwater Contamination:   20ft bgs
Plume Size:   Plume Length: 150ft
Plume Width: 110ft
Plume Thickness: 10ft
Average Depth to Groundwater:   10ft

Lithology and Subsurface Geology

 
  fine sand, silt, clay, and peat beds

Conductivity: 10ft/day

Pathways and DNAPL Presence

checkGroundwater
Sediments
Soil
DNAPL Present

Remediation Scenario

Cleanup Goals:
  Reduce CVOC mass in a timely and effective manner.

Technologies

In Situ Bioremediation
 

Why the technology was selected:
Safe and cost-efficient. EHC® is a controlled-release, integrated carbon and zero valent iron (ZVI) source that yields redox potential (Eh) in the -500 to -650 mV range. This Eh is significantly lower than that achieved when using either organic materials (lactate, molasses, and sugars) or reduced metal alone. Eh potentials in this range facilitate the timely and effective removal of normally recalcitrant chlorinated organics (e.g., CT, PCE) and other persistent compounds (e.g., perchlorate) without the formation of potentially problematic intermediates, such as DCE/VC from the anaerobic degradation of PCE/TCE or CF/DCM from the anaerobic degradation of CT.

Date implemented:
January 2005

Final remediation design:
24,100 lbs of EHC were injected into the two hot spot areas, giving an EHC application rate of 0.06% to soil mass.

Results to date:
Six months following the EHC injection, TCA levels had decreased by 94% and TCE levels had decreased by 84% to 90% at the target areas without the accumulation of problematic catabolites. No air issues were identified.

Next Steps:
With an estimated life of greater than 36 months, EHC is expected to continue stimulating reductive dechlorination at this site.

Cost to Design and Implement:
The material cost of using EHC for plume treatment was $3.65/yd3

In Situ Zero Valent Iron
 

Why the technology was selected:
Safe and cost-efficient. EHC® is a controlled-release, integrated carbon and zero valent iron (ZVI) source that yields redox potential (Eh) in the -500 to -650 mV range. This Eh is significantly lower than that achieved when using either organic materials (lactate, molasses, and sugars) or reduced metal alone. Eh potentials in this range facilitate the timely and effective removal of normally recalcitrant chlorinated organics (e.g., CT, PCE) and other persistent compounds (e.g., perchlorate) without the formation of potentially problematic intermediates, such as DCE/VC from the anaerobic degradation of PCE/TCE or CF/DCM from the anaerobic degradation of CT.

Date implemented:
January 2005

Final remediation design:
24,100 lbs of EHC were injected into the two hot spot areas, giving an EHC application rate of 0.06% to soil mass.

Results to date:
Six months following the EHC injection, TCA levels had decreased by 94% and TCE levels had decreased by 84% to 90% at the target areas without the accumulation of problematic catabolites. No air issues were identified.

Next Steps:
With an estimated life of greater than 36 months, EHC is expected to continue stimulating reductive dechlorination at this site.

Cost to Design and Implement:
The material cost of using EHC for plume treatment was $3.65/yd3

Costs

Cost for Assessment:
 
Cost for Operation and Maintenance:
 
Total Costs for Cleanup:
 

Lessons Learned

Effectively reduced CVOC mass without generating problematic daughter products.

Contacts

Jim Mueller, Ph.D.
Director Remedial Solutions & Strategies
Adventus Americas Inc.
2871 W. Forest Road - Suite 2 Freeport, IL 61032
Jim.Mueller@AdventusGroup.com

office 815 235-3503 / fax 815 235-3506 / cell 630 309-1175
www.adventusgroup.com / www.aquablokinfo.com / www.adventus.us / www.eti.ca