Environmental Services at Multiple Sites for Fort Riley Military Reservation

The Louis Berger Group, Inc. (Berger) was contracted to conduct remedial investigation (RI) and feasibility study (FS), interim removal action (IRA), and remediation activities at multiple sites/facilities at the Fort Riley Military Reservation in Kansas. 

The site is located in a complex hydrogeologic formation that includes multiple layers of soils and rock, confined and unconfined aquifers and numerous subsurface utilities that presented challenging conditions for investigation, evaluation of subsurface conditions and remediation.  Site contamination includes petroleum products, chlorinated solvents, and SVOCs in both soils and groundwater and in off-installation private water supply wells. 

The following describes the main activities performed:

• Conducted RI field investigation consisting of soil borings, monitoring wells, surface soil samples, surface water sediment samples and geotechnical analytical samples.

• Created a customized hazardous waste Geographic Information System (GIS) for the hydrological, geological and chemical features resulting from the RI. Berger's GIS substantially shortened the data reduction time, improved representation of the complex surface conditions and was used as a presentation tool that eased the regulators understanding of site conditions and expedited their review of the project.

• Implemented a baseline human health risk assessment which identified public and ecological risks at and near the site.

• Conducted a Feasibility Study to identify Applicable or Relevant and Appropriate Requirements and remediation goals for each medium of concern.

• Executed a dual phase extraction pilot study to evaluate the effectiveness of remediating soil and groundwater media of concern. The dual-phase extraction system was so effective that no further remediation was required at this site.

• Performed a treatment program using in-situ bioremediation and SVE, including system installation and operation.

• Utilized dual phase treatment approach to treat the source area for the volatile and semi-volatile contamination that existed in both soils and groundwater. 

• Executed a water supply remedial action to address impacts to off-site water supply wells, including the construction of a new water main from the municipal supply system nearby.