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Dr. Michael G. McMurtry, M.D. STS Consultants, Ltd. 10900 - 73rd Ave. N., Suite 150 Maple Grove, MN 55369-5547 612/315-6300 U.S. FILTER 55 Shuman Boulevard Naperville, IL 60563 630/357-7330
This presentation provides
an overview of the investigation and remediation of mercury contamination
inside industrial facilities that have used elemental mercury
in manufacturing processes. A Preliminary Hazard Assessment may
be performed to identify human receptors, anticipated contaminant
migration pathways (given the building’s design and the
history of operations), and the potential exposure pathways of
concern based on the current and anticipated future uses of the
facility under evaluation. This preliminary assessment helps
in preparing a Project Work Plan for the facility investigation,
which may include surface wipe sampling, air screening evaluations
with a portable mercury vapor analyzer, submittal of indoor air
quality samples to a qualified analytical laboratory, and implementation
of a Site Safety Plan to protect cleanup contractors and building
occupants. Decisions about cleanup depend, in part, on the selection
of criteria for determining project completion. These project
"closure criteria" may consist of regulatory standards
(if available). If regulatory standards are deemed inappropriate
for the site, or conditions under evaluation, indoor cleanup
criteria may be developed by performing a quantitative health
risk assessment. The outcome of the risk assessment may include
project-specific closure criteria such as "background"
thresholds (using data collected from other buildings) and/or
risk-based cleanup goals applicable to various media (i.e., indoor
air, building surfaces, etc.). Establishing valid criteria for
project closure involves careful consideration of numerous factors
(such as property uses, occupancy, potential real-estate transactions,
and future liabilities). This process requires input and acceptance
from the current owner and the regulatory agency involved. |
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