Technology Status Report: In Situ Flushing - CLU-IN

In Situ Flushing Project Summaries
GWRTAC Case Study Database
GWRTAC ID: FLSH0039
Project Name: Camp Lejeune Marine Corps Base
City: Camp Lejeune State/Province: NC
Primary GWRTAC Personal
Communication Source
(Name/Organization):
Project Summary:
Fred Holzmeyer
Duke Engineering & Services
Report(s)/Publication(s) (GWRTAC Source):
None
The following text was provided in a project summary on September 8, 1998 by Duke Engineering
& Services of Austin, TX:
A Remedial Investigation (RI) recently conducted at Marine Corps Base Camp Lejeune, North
Carolina has revealed the presence of an extensive aqueous plume of tetrachloroethene (PCE) in
the vicinity of the Base dry cleaning facility known as Building 25. The RI delineated the extent of
the ground-water plume for this area, referred to as Site 88, and reported aqueous PCE
concentrations up to 54 mg/L. However, this large-scale investigation did not confirm the presence
of dense nonaqueous phase liquids (DNAPL) in the subsurface. Site 88 was listed by Naval
Facilities Engineering Service Center (NAVFAC) as a candidate site (i.e. likely to have DNAPL
present in the subsurface) for conducting a field demonstration of surfactant enhanced aquifer
remediation (SEAR) with surfactant recycling and reinjection. The SEAR field demonstration is
funded by the Navy’s Environmental Securities Technology Certification Program (ESTCP) to
promote the advancement of innovative technologies for effective remediation of Department of
Defense sites contaminated with DNAPL and/or light nonaqueous phase liquids (LNAPL).
However, before Camp Lejeune could be selected by ESTCP as the SEAR demonstration site, the
DNAPL source zone at Site 88 had to be located, characterized, and evaluated per site selection
criteria.
In support of the ESTCP site selection process, a DNAPL source-zone investigation was conducted
at Site 88 by Duke Engineering & Services (DE&S) which included three phases of investigation.
The objectives of Phase 1 of this investigation were to: (1) locate the DNAPL zone, (2) delineate
the horizontal and vertical extent of DNAPL at the site, and (3) characterize the geosystem of the
DNAPL zone (i.e. hydrostratigraphy, hydraulic and geochemical properties of the aquifer, and
approximate DNAPL saturations). The Phase 1 investigation consisted of a relatively small scale,
detailed program of soil borings and included collection of methanol-preserved soil samples.
Borings were completed beneath the building and around the perimeter of the building to a depth of
about 21 feet below ground surface. The DNAPL investigation found free-phase and residual
DNAPL located at a depth interval of approximately 17 to 20 feet below ground surface. The
DNAPL zone is bounded below by a clay aquitard which functions as an effective capillary barrier
to prevent further downward migration of DNAPL. The DNAPL zone is located beneath the
northern portion of Building 25 and also extends to an area approximately 20 to 30 feet beyond the
north side of the building. This investigation also revealed the presence of LNAPL smeared across
Ground-Water Remediation Technologies Analysis Center
Operated by Concurrent Technologies Corporation
Appendix - Page 79 of 164
Copyright GWRTAC 1998
Revision 1
Tuesday, November 17, 1998