Remedial Investigation and Feasibility Study at Concord Naval Weapons Station

Adanta was awarded a task order to conduct a Remedial Investigation/Feasibility Study (RI/FS) at the Red Rock Main Disposal Area (MDA) for materials potentially presenting an explosive hazard (MPPEH), munitions constituents (MC) and CERCLA contaminants at Former Naval Weapons Station Seal Beach Detachment Concord (NWS Concord). The study evaluates chemical, munition, and unexploded ordnance impacts in soils and groundwater at the Site. Naval Facilities Engineering Command (NAVFAC) Southwest is administering the contract, and the NAVFAC Base Realignment and Closure Program Management Office West (BRAC PMO West) is managing the work. 

Adanta is conducting a Remedial Investigation (RI) to: (1) evaluate the nature and extent of Munitions of Explosive Concern (MEC)/ Material Potentially Presenting An Explosive Hazard (MPPEH) and/or other metallic debris throughout the site; (2) to prepare a MEC hazard assessment (HA) to evaluate baseline explosives safety hazards to people and evaluate alternatives to address unacceptable hazards identified at the site, as appropriate; (3) to define the nature and extent of chemicals of potential concern (COPCs) and chemicals of potential ecological concern (COPECs); and (4) to conduct a baseline human health risk assessment (HHRA) and ecological risk assessment (ERA) to evaluate the risk to human health and the environment of residual contaminants at Red Rock MDA.  

The Red Rock MDA is the focus of this investigation and covers approximately 5.7 acres surrounded by a soil berm. The Final Preliminary Assessment/Re-verification Investigation Report for the Inland Areas (PA/RVI) recommended further investigation because munitions items were discovered and could not be fully cleared. Additional investigation of soil was recommended where stained soil was encountered, but not sampled to evaluate the nature and extent of COPCs in the stained soil.  

The RI was deemed necessary because data gaps were identified during the previous investigations and following the PA/RVI within areas where stained soil and/or construction and demolition (C&D) debris and MEC/MPPEH were encountered within the vicinity. 

Adanta’s services include all work required to complete the planning and field investigations of CERCLA contaminants and MPPEH with Navy and regulatory concurrence. All work is being performed following applicable and appropriate Department of Defense (DOD) guidance and policy for Munitions Response Program (MRP) and CERCLA and considers all site documentation and reports to date.  Adanta is required to obtain final approval of the work as required by the Navy RPM, and Naval Ordinance Safety and Security Activity (NOSSA).  Performance of this contract requires Adanta to directly interface with NOSSA to ensure proper safety protocols are developed and followed for implementation of fieldwork.