EPA 542-R-11-013, 69 pp, Jan 2012
In 1982, the City of Liberty and the State of Missouri identified the Lee Chemical site as a source of TCE contamination in the public water supply. The current remedy in place for this Superfund site consists of the operation of an in situ flushing system (referred to in the site documents as an in situ aqueous soil washing system), extraction of groundwater from extraction wells EX-1 and PW-2, and discharge of the extracted groundwater from both extraction wells to a single permitted outfall to Town Branch Creek. This remedial action is monitored and documented in monthly and quarterly progress reports. The site remedy was considered operational and functional on March 26, 1994. Soil contamination readily mobilized by soil flushing has been removed long since, but soil contamination remains and might be mobilized when the water table rises to historically high levels and/or remedy pumping decreases substantially. Recommendations are provided to improve remedy effectiveness, provide technical improvement, and gain site closure: 1) improve understanding of groundwater flow, 2) sample additional intervals in wells with long screen intervals, 3) sample for 1,4-dioxane, 4) sample for monitored natural attenuation parameters, 5) consider additional potential locations for monitoring points, 6) submit blind field blank samples to the laboratory to evaluate potential for laboratory contamination with acetonitrile, 7) postpone soil vapor sampling until soil flushing has been discontinued and the vadose zone is dewatered, 8) consider various approaches to proceeding with site remediation based on the information collected from implementing the other recommendations, and 9) evaluate potential for soil vapor intrusion using existing infrastructure. No considerations were identified for reducing cost or for meaningful reduction of the remedy environmental footprint. www.epa.gov/tio/download/remed/rse/lee-chemical-report.pdf
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