NON-AQUEOUS PHASE LIQUID (NAPL) CLEANUP ALLIANCE
The Non-Aqueous Phase Liquid (NAPL) Cleanup Alliance was established
early in 2001 as one of the six active Action Teams under the Remediation
Technologies Development Forum (RTDF). The RTDF fosters collaboration between
the public and private sectors in developing innovative solutions to mutual
hazardous waste problems. The Alliance is made up of representatives from the
petroleum industry, federal and state government, and academia who share an
interest in evaluating a range of technologies for remediation and management
of large-scale, non-aqueous phase liquid (NAPL) contamination.
This report documents progress of the NAPL Cleanup Alliance during the
fourth quarter of 2001.
- Randy Breeden, U.S. Environmental Protection Agency (EPA) Region 8,
and Mark Lyverse, Chevron Research and Technology Company, co-chaired the third
Alliance meeting in November 2001. The agenda for the meeting included updates
on the work of the three Alliance Working Groups (see 2-4 below), including
detailed discussion and finalization of an outline for a decision-making
framework that describes how to address large-scale sites that have significant
NAPL issues resulting in relatively large and prolonged expenditures.
- The Project Technical Working Group continued work on a pilot a
project to address NAPL contamination at a former refinery site in Casper, WY.
Work on the project focuses on analyzing the mobility and behavior of
hydrocarbons at the site and evaluating various cost-effective cleanup
technologies to identify feasible remedies that reduce contaminant
concentrations below practical endpoints, so that the site would be considered
acceptable for future re-use. During the quarter, the Working Group planned and
conducted the first two stages of an investigation of the site to provide data
for an evaluation of NAPL distribution, mobility and natural attenuation
mechanisms. The investigative techniques included the collection of data which
will be used to estimate in situ oil saturation and mobility. The
working group used an innovative investigation technology, the Navy's Site
Characterization and Analysis Penetrometer System (SCAPS), to conduct the first
phase of the investigation. This technology offered the benefits of providing
more data at a lower cost than conventional methods, and an improved
understanding of complex NAPL distribution and heterogeneity. Fluid and soil
samples were also collected and submitted to a petroleum engineering laboratory
for analysis of various fluid and soil-fluid interaction properties. The data
obtained from these investigative tools will be used along with the laboratory
data to provide estimates of and of NAPL mobility and recoverability and
biodegradation rate-constants. A report on results of the investigation is
expected to be available in Spring 2002 and will be posted on the RTDF/NAPL
Cleanup Alliance World Wide Web site (www.rtdf.org/public/napl/).
- The Decision Framework Working Group completed a draft outline for a
decision-making framework for managing NAPLs at large-scale sites. NAPL Cleanup
Alliance members provided comments, discussed, revised, and finalized the
outline during the November meeting. The Alliance retained a contractor to
prepare a draft document based on the outline. Members hope to invite state and
federal regulators and others to review the draft and provide comments during a
meeting in 2002.
- The Technical Information Working Group continued its cooperation
with an ongoing project for the Ground-Water Remediation Technologies Analysis
Center (GWRTAC), sponsored by the U.S. Department of Energy, to compile a
searchable database of existing information on NAPL research and cleanup
projects in the United States and Europe. When the database is completed, the
information will be made available via the Internet. The Alliance (www.rtdf.org/public/napl/) and
GWRTAC (www.gwrtac.org) will provide access
to the database via their Internet sites.
- Alliance members participate in periodic conference calls to discuss
project progress and organizational issues. The next Alliance meeting is
expected to be in April 2002.