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Conclusions

This complex ERH project was performed under a guaranteed fixed price remediation (GFPR) contract. Based upon the data collected before and during the project and the final results produced for the ERH remediation of NAPL Areas 1, 2 and 3, the following conclusions were drawn:

• All of the remedial objectives were met for each NAPL Area.
• The challenges presented by the unexpected and unpredictable groundwater flow rates and flow directions in NAPL Areas 1 and 2 were mitigated with the expansion of the hydraulic control system including additional up gradient groundwater extraction wells and the addition of a second 2,000 kW PCU to overcome heat losses.
• The total mass removed from all three NAPL Areas as a result of ERH was about 126,570 pounds. About 90% of the total mass was removed as TPH, about 8% was TCE and about 2% was cis DCE. Less than 1% of the total mass was removed as vinyl chloride.
• The groundwater and soil concentration reductions were significant. Average TCE concentrations in groundwater were reduced by 99.5%, 93.4% and 98.1% in NAPL Areas 1, 2 and 3, respectively.
• Average TCE concentrations in soil were reduced by 99.7% and 99.99% in NAPL Areas 1 and 2, respectively. Data for the reduction of TCE in soil for NAPL Area 3 was not available at the time of this description.
• Greater than 50% of the soil samples were non-detect at 100 ppb TCE in NAPL Areas 1 and 2.
• The groundwater data indicates surgical treatment.
• The data suggest potentially significant in situ destruction of contaminants.
• The data indicate no foreseeable rebound
• TRS completed this project realizing an overall 50% savings to the Army. The original contract award was $25M. By implementing lessons learned throughout the remediation of each NAPL Area, the excellent performance of the TRS project team and the TRS ERH specialty equipment, TRS completed the ERH remediation for half the original contract award amount or $12M.

Other Concurent Project Activities

During the course of the ERH remediation at NAPL Areas 1, 2, and 3, the following concurrent project activities have been accomplished in order to better understand the site, better quantify the effectiveness of the ERH process, and to investigate the effects of biological and abiotic reactions on the in situ destruction of TCE:

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Site Characteristics and Design Parameters
NAPL Area 1
NAPL Area 2
NAPL Area 3
Conclusions