Annual Report of Groundwater Monitoring at Centralia, Kansas, in 2011

Technical Report · Fri Jun 01 00:00:00 EDT 2012

DOI:https://doi.org/10.2172/1052964· OSTI ID:1052964

LaFreniere, L. M. ^[1]

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1. Argonne National Laboratory (ANL), Argonne, IL (United States)

Periodic sampling is performed at Centralia, Kansas, on behalf of the Commodity Credit Corporation of the U.S. Department of Agriculture (CCC/USDA) by Argonne National Laboratory, in accord with the current interim monitoring program approved by the Kansas Department of Health and Environment (KDHE 2009). The objective is to monitor levels of carbon tetrachloride contamination identified in the groundwater sitewide (Argonne 2003, 2004, 2005a), as well as the response to the interim measure (IM) pilot test that is in progress (Argonne 2007b). An earlier monitoring plan (Argonne 2005b) was also approved by the KDHE (2005). Under this earlier plan, the groundwater was sampled twice yearly from September 2005 until September 2007 for analyses for volatile organic compounds (VOCs), as well as measurement of selected geochemical parameters to aid in the evaluation of possible natural contaminant degradation processes (reductive dechlorination) in the subsurface environment (Argonne 2006, 2007a, 2008a). The results from the two-year sampling program demonstrated the presence of carbon tetrachloride contamination at levels exceeding the KDHE Tier 2 risk-based screening level (RBSL) of 5 µg/L for this compound, in a localized groundwater plume that has shown little movement. The relative concentrations of chloroform, the primary degradation product of carbon tetrachloride, suggested that some degree of reductive dechlorination or natural biodegradation was talking place in situ at the former CCC/USDA facility on a localized scale. After two years of monitoring under the earlier plan, the CCC/USDA developed an Interim Measure Conceptual Design (Argonne 2007b), proposing a pilot test of the Adventus EHC technology for in situ chemical reduction (ISCR). The proposed IM was approved by the KDHE in November 2007 (KDHE 2007). Implementation of the pilot test occurred in November-December 2007. The objective was to create highly reducing conditions that would enhance both chemical and biological reductive dechlorination in the injection test area (Argonne 2009a).

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDA; USDOE
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1052964
• Report Number(s): ANL/EVS/AGEM/TR--12-04
• Country of Publication: United States
• Language: ENGLISH