Treatability Study in Support of Intrinsic Remediation for Fire Protection Training Area 3

This report presents the results of a treatability study performed by Parsons Engineering Science, Inc. (Parsons ES) at Fire Protection Training Area 3 (FPTA3), Offutt Air Force Base, Nebraska to evaluate the use of intrinsic remediation (natural attenuation) with long-term monitoring (LTM) as a remedial option for dissolved benzene, toluene, ethylbenzene, and xylene (BTEX) contamination in the shallow groundwater. Residual light nonaqueous-phase liquid (LNAPL) is present within the soil and dissolved contamination is present in the groundwater. There is no evidence of mobile LNAPL (free product) at this site. This study focused on the impact of dissolved BTEX on the shallow groundwater system at the site. Dissolved chlorinated solvents also are present in the shallow groundwater; therefore, the impact of the dissolved chlorinated solvents was studied as well. Site history and the results of soil and groundwater investigations conducted previously are also summarized in this report.