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SITE TECHNOLOGY CAPSULE: NOVOCS EVALUATION AT NAS NORTH ISLAND
Citation:
Hough, B. SITE TECHNOLOGY CAPSULE: NOVOCS EVALUATION AT NAS NORTH ISLAND. EPA/540/R-00/502, 2000.
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Description:
This is a SITE Technology Capsule. The MACTEC, Inc. (MACTEC), NoVOCs(TM) in-well volatile organic compounds (VOC) stripping technology is an in-situ groundwater remediation technology designed for the cleanup of groundwater contaminated with VOCs. The NoVOCs(TM) technology was evaluated under the Superfund Innovative Technology Evaluate (SITE) Program at Naval Air Station (NAS) North Island, Installation Restoration Site 9 to assess the technology's ability to treat groundwater contaminated with high levels of chlorinated and aromatic hydrocarbons. Because of operational difficulties associated with biofouling and to a lesser extent iron precipitation on the NoVOCs well screen during the evaluation, a complete evaluation of the performance and cost characteristics of the NoVOCs technology could not be conducted. VOC results for goundwater samples collected from the NoVOCs system indicated that 1,1-dichloroethene (1.1.-DCE), cis-1,2-dichloroethene (cis-1,2-DCE), and trichloroethene (TCE) concentrations were reduced by greater than 98, 95, and 93%, respectively. The average total VOC mass removed by the NoVOCs system ranged from 0.1 to 0.14 lbs/hr and averaged 0.10 lbs/hr during the evaluation. Accounting for the sporadic operation of the NoVOCs system was estimated to be approximately 92.5 lbs. Because of the sporadic operation of the NoVOCs system, a direct evaluation of the radial extent of the NoVOCs treatment cell was not conducted. However, results from the dipole flow test data show that measurable pressure changes occur at crossgradient locations 30 feet from the NoVOCs well and may be observed at farther distances.