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Rao et al. 1997
Rao, P.S.C., Annable, M.D., Sillan, R.K., Dai, D., Hatfield, K., Graham, W.D., Wood, A.L. and Enfield, C.G. (1997). Field-scale evaluation of in situ cosolvent flushing for enhanced aquifer remediation. Water Resources Research 33: doi: 10.1029/97WR02145. issn: 0043-1397.

A comprehensive, field-scale evaluation of in situ cosolvent flushing for enhanced remediation of nonaqueous phase liquid (NAPL)-contaminated aquifers was performed in a hydraulically isolated test cell (about 4.3 m¿3.6 m) constructed at a field site at Hill Air Force Base, Utah. This sand-gravel-cobble surficial aquifer, underlain by a deep clay confining unit at about 6 m below ground surface, was contaminated with a multicomponent NAPL as a result of jet fuel and chlorinated solvent disposal during the 1940s and 1950s. The water table within the test cell was raised to create a 1.5 m saturated flow zone that contained the NAPL smear zone. The cosolvent flushing test consisted of pumping about 40,000 L (approximately nine pore volumes) of a ternary cosolvent mixture (70% ethanol, 12% n-pentanol, and 18% water) through the test cell over a period of 10 days, followed by flushing with water for another 20 days. Several methods for assessing site remediation yielded consistent results, indicating that on the average >85% mass of the several target contaminants was removed as a result of the cosolvent flushing; NAPL constituent removal effectiveness was greater (90--99+%) in the upper 1-m zone, in comparison to about 70--80% in the bottom 0.5-m zone near the clay confining unit. Various interacting factors that control the hydrodynamic sweep efficiency, and the NAPL removal effectiveness during cosolvent flushing in this unconfined aquifer are discussed. ¿ 1997 American Geophysical Union

BACKGROUND DATA FILES

Abstract

Keywords
Hydrology, Groundwater transport
Journal
Water Resources Research
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Publisher
American Geophysical Union
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