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GWERD Research on Hydrochemical Processes at the Ground Water-Surface Water Interaction Zone
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Ground water discharge to surface water is recognized as an important
process governing contaminant fate and transport and ecosystem viability
within watersheds.
Reliable assessment of long-term patterns of the chemistry and hydrology
in watersheds under the influence of ground water discharge is dependent
on
establishing a monitoring strategy that captures both the spatial
and temporal dynamics of processes occurring at the ground water-surface
water (GW-SW) interaction
zone. The information gathered from this monitoring effort provides
the basis for assessing the impact of ground-water discharge on human and
ecosystem health and
for evaluating ecosystem response to remediation and restoration
activities.
Recent Highlights
- Presentation: Arsenic Source Identification at the Ground Water-Surface
Water Interaction
Zone at a Contaminated Site.
This presentation was given at the RCRA 2003 National Meeting, "Putting
Resource Conservation
into RCRA" August 12-15, in Washington, DC. An overview was provided
of the monitoring
strategy employed to differentiate the sources of arsenic within
a surface water impoundment
receiving contaminated ground water at a Superfund site. Monitoring
data collected within
and adjacent to the boundaries of the GW-SW interaction zone provided
evidence that arsenic
within the surface water impoundment was derived from both direct
ground-water discharge and
sediment dissolution. Delineation of the sources of arsenic provides
the basis for development
of appropriate remedial strategies to achieve site cleanup. This
study will be published as
part of the Conference Proceedings that will be available in Fall
2003.
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