Installation Restoration Program Preliminary Assessment/Site Inspection. Volume I.
1997
Cason, Russell
This PA/SI Report presents information on potentially contaminated areas identified in the PA process as Areas of Concern (AOC's) at the 157(th) Air Control Group (ACG), Jefferson Barracks ANGS, St. Louis, MO. The Air National Guard Readiness Center/Installation Restoration Branch (ANGRC/CEVR) authorized OpTech to prepare the PA/SI Report. Work on the PA began in November 1993. Information obtained through interviews, review of station records, and field observations resulted in the identification of four potentially contaminated disposal and/or spill areas (AOC's). The four AOC's identified include the Disposal Area (AOC-A), Storage Area (AOC-B), Drainage Ditch (AOC-C), and Waste Oil Dump (AOC-D). These AOC's were investigated, using screening and confirmation activities, to determine if contamination exists that justifies further investigation as an IRP site. Considering the results of the PA/SI conducted, no additional IRP activities are warranted at AOC-A, AOC-C, and AOC-D. At AOC-B additional investigation is recommended because the vertical and areal extent of TPH contamination is in excess of MDNR cleanup guidelines. In addition, the PA/SI Report recommended a risk-based evaluation to determine action levels for PAH impacted surface soils at AOC-B.
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