Final report : results of the 2007 targeted investigation at Hilton, Kansas.
The Commodity Credit Corporation (CCC), an agency of the U.S. Department of Agriculture (USDA), operated a grain storage facility in Hilton, Kansas, in 1954-1965. In 1992, carbon tetrachloride was first identified, at a concentration of 910 {micro}g/L, in groundwater from well GW01 at Hilton. This discovery occurred in association with the sale of the private grain storage facility on which well GW01 is located to the current owner, the Mid-Kansas Cooperative Association. The Kansas Department of Health and Environment conducted investigations at Hilton in 1992-1994. In 1996-1997, Argonne National Laboratory conducted Phase I and Phase II investigations on behalf of the CCC/USDA to characterize the distribution of the carbon tetrachloride contamination identified in well GW01, the stratigraphic units potentially hosting contaminant migration, and local hydrogeology in the Hilton area. The 2007 targeted investigation reported here focused specifically on the former CCC/USDA property at Hilton, west of the railroad tracks. (Until a property record search in 2005, the location of the CCC/USDA's former facility at Hilton was not known with certainty.) The objectives of the investigation, as implemented, were to (1) investigate for carbon tetrachloride contamination in the shallower soil and shallow aquifer units below the former CCC/USDA property and (2) investigate groundwater flow patterns. The key results of the 2007 targeted investigation are as follows: (1) No carbon tetrachloride or chloroform contamination was found in soil or groundwater below the former CCC/USDA facility. (2) The 2007 groundwater level data support a southwesterly direction for groundwater flow in the main Hilton aquifer (Equus Beds), consistent with findings of previous investigations. Contaminated well GW01 was confirmed to be upgradient from the former CCC/USDA facility. (3) The contaminants carbon tetrachloride, chloroform, and 1,2-dibromoethane (ethylene dibromide) were found in groundwater only at well GW01. No evidence of contamination was found in other monitoring wells and piezometers. This pattern is consistent with findings of previous investigations. The findings of the 2007 targeted investigation clearly demonstrate that the former CCC/USDA facility at Hilton was not the source of the carbon tetrachloride contamination persistently detected in well GW01. Well GW01 is approximately 300 ft upgradient from the former CCC/USDA facility. This well is the only sampling location at Hilton where carbon tetrachloride contamination in groundwater has ever been identified. The CCC/USDA never operated grain storage facilities on the property on which well GW01 is located.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDA
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 929264
- Report Number(s):
- ANL/EVS/AGEM/TR-07-13; TRN: US200814%%109
- Country of Publication:
- United States
- Language:
- ENGLISH
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