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Air Sparging Pilot Testing Including In‐Well Temperature Measurement
Author(s) -
Eisenbeis John J.
Publication year - 1997
Publication title -
remediation journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.762
H-Index - 27
eISSN - 1520-6831
pISSN - 1051-5658
DOI - 10.1002/rem.3440080104
Subject(s) - air sparging , environmental science , sparging , groundwater , contamination , plume , water well , vinyl chloride , environmental engineering , waste management , environmental remediation , chemistry , geology , engineering , meteorology , ecology , geotechnical engineering , organic chemistry , copolymer , biology , polymer , physics
Air sparging was pilot tested at a site where a groundwater plume containing cis‐1,2‐dichloroethene ( cis ‐DCE), vinyl chloride (VC) and arsenic resulted from landfill operations. In addition to the commonly used methods for estimating air sparging zone of influence (ZOI), in‐well temperature was monitored using sensitive thermocouples and data loggers at several monitoring wells of various screened intervals during the test. Following 42 days of pilot testing, the downgradient monitoring well samples were below maximum contaminant levels (MCLs)for all contaminants of concern, VC and dissolved arsenic were below detection limits (0.5 and 10 milligrams per liter [μg/L], respectively) in all of the downgradient monitoring wells. The ZOI monitoring results indicated that at some locations use of mounding data may overestimate the ZOI when the temperature data suggest that no sparged air was entering the well screen. Therefore, monitoring in‐well temperature may provide additional useful information for estimating air sparging ZOI and is more indicative of air pathways than other monitoring methods. In addition, the temperature data were valuable for selecting a pulse frequency and duration to optimize groundwater mixing.