Remediation Technology Demonstration Project Profiles
Air Sparging Through a Horizontal Well at Camp Lejeune in North Carolina
Last Updated: July 6, 2007 |
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| Site Identifying Information | ||
| Site Name, Location: | Marine Corps Base, Camp Lejeune, North Carolina, United States
(EPA Region 4) |
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| Cleanup Program: | Not Specified | |
| Entity Responsible for Cleanup: | Not Specified | |
| Site Type: | Underground Storage Tank Site | |
| Government Affiliation: | Federal | |
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| Project Information | ||||||||||
| Project Name: | Air Sparging Through a Horizontal Well at Camp Lejeune in North Carolina | |||||||||
| Project Status: | Complete | |||||||||
| Contaminants Treated: |
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| Media Treated: |
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| Demonstration Technology and Type: | Air Sparging (In Situ Physical/Chemical) |
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| Geology and Hydrogeology: | Geology at the site consists of silty clay overburden underlain by partial cemented silty sand and gravel with thin discontinuous clay lenses within the transition zone. | |||||||||
| Demonstration Year: | 2006 | |||||||||
| Year of Publication: | 2006 | |||||||||
| Goal of the Demonstration: | To evaluate the performance of air and ozone-enhanced air sparging by use of a horizontal well. Specific objectives were 1) to evaluate the distribution of air using a horizontal well, and 2) to compare the relative performance of mass transfer to combined in-situ oxidation and air stripping using ozone enhanced air sparging. | |||||||||
| Design and Operations: | Contamination was found at a depth of 40 to 45 feet below ground surface (bgs). Horizontal directional drilling (HDD) was used for subsurface gas delivery. The HDD well was made of 6-inch diameter SDR 11 high-density polyethylene with a slotted section that measured 350 feet in length and was positioned at 60 feet bgs. Monitoring wells were installed on both sides of the well. Air sparging took place for 3 months at a flow rate of 140 standard cubic feet per minute. | |||||||||
| Performance Data Relevant to Demonstration Goals: | After the first 3 months, when only air sparging was used, TCE concentrations were reduced by 90% when the distance of influence of air sparging was found to be approximately 50 feet on both sides of the well. Combined air and ozone sparging was conducted for 5 months at a concentration of approximately 7,000 parts per millionv, little change was observed in TCE concentrations, dissolved chloride, or oxidation reduction potential. At the end of the 1 year study, TCE concentrations were reduced by 99% in all of the monitoring wells with pre-treatment concentrations exceeding 50 µg/L. The maximum contaminant level was achieved in 14 of the 16 wells sampled, excluding the two deep wells located above the slotted portion of the sparging well. | |||||||||
| Interesting Aspects or Significance of the Demonstration: | Unusual or Novel Aspects of Technology Design | |||||||||
| Other Demonstration Information (such as cost data, if available): | HDD was selected for subsurface gas delivery because of site constraints, including an active flight line, buried underground utilities, and configuration of the plume. | |||||||||
| Vendor(s) or Consultant(s) Associated with the Demonstration: |
CH2M Hill, Inc. |
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| Information Source(s) for the Demonstration: |
Strong, Mark, Christopher Bozzini, Daniel Hood, and Bob Lowder. Air and Ozone Sparging of TCE Using a Directionally Drilled Horizontal Well. Presented at the 5th International Conference on Remediation of Chlorinated and Recalcitrant Compounds, Monterey, California (May 22-25, 2006). http://www.battelle.org/bookstore# |
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| Contact Information | ||||||||||
| Point(s) of Contact: |
Dan Hood U.S. Naval Facilities Engineering Command (NAVFAC) Jacksonville, North Carolina, United States Telephone: 757-322-4630 E-mail: Daniel.r.hood@navy.mil |
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Christopher Bozzini CH2M HILL Charlotte, North Carolina, United States |
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Bob Lowder Camp Lejeune EMD Jacksonville, North Carolina, United States |
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Mark Strong (Primary Contact) CH2M Hill 4824 Parkway Plaza Blvd, Suite 200 Charlotte, North Carolina, United States Telephone: 704-329-0072 Fax: 704-329-0141 E-mail: mstrong@ch2m.com |
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