Secretary of Defense Environmental Award Fiscal Year 2016: Submission for Environmental Restoration - Installation, 7 pp, 2017

Accelerated environmental cleanup at Camp Pendleton has included implementation of in situ thermal remediation at Installation Restoration Site 1115 to address TCE, DCE, naphthalene, benzene, and ethylbenzene in an area once used for vehicle maintenance, repair, painting, washing, and fuel service. Two groundwater plumes, one shallow and one deep, emanate from the area beneath paved surfaces. Operation of a multi-phase extraction system prior to active subsurface heating controlled groundwater migration through the thermal treatment zone and reduced the heating system's energy consumption. During 104 days of active heating, the effluent extraction and treatment system processed 1.4E+08 cubic feet of contaminant-laden off-gas and 1.8E+05 pounds of extracted liquids. IR site 1115 also was selected for a hydraulic fracturing pilot study whose results indicated that fracturing could enhance subsurface permeability sufficiently to allow in situ treatment. To address chlorinated herbicides at IR site 1120, Camp Pendleton implemented the Vapor Energy Generator (VEG) system, a mobile ex situ technology, to lower contaminant concentrations below detection limits. VEG technology relies on vapors generated during thermal soil treatment to serve as fuel for system operation. At IR Site 1119, a plume of dissolved-phase TCE is being addressed by source area treatment via in situ enhanced bioremediation and installation of a reactive barrier via injection wells downgradient of the source area. https://www.denix.osd.mil/awards/2017secdef/environmental-restoration-installation/marine-corps-base-camp-pendleton-california/