Abstracts
IAH_CNC_WEB2
IAH_CNC_WEB2
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Robert Ingleton & Tadeusz Gorecki<br />
Department of Earth and Environmental Sciences, University of Waterloo, Ontario, Canada<br />
Michael O. Bower<br />
The Boeing Company, Canoga Park, California, USA<br />
Eric VanderVelde<br />
MWH Americas, Arcadia, California, USA<br />
The Shaw Portable Core Drill was used to install bedrock vadose zone monitoring probes at<br />
an industrial facility in southern California where in the 1950s-1960s an estimated 2 million<br />
litres of immiscible phase trichloroethene (TCE) was released into the subsurface. The subsurface<br />
is composed of faulted Late Cretaceous age turbidite sandstones with shale interbeds.<br />
TCE, as dense non-aqueous phase liquid, entered the fractures at many locations decades ago<br />
where it was dissolved and subsequently diffused into the rock matrix. Sampling and analysis<br />
of rock core (COREDFN) indicates contaminants present in the vadose zone rock matrix at<br />
contaminant input locations. The Shaw drill was used to drill 51 millimeter diameter holes<br />
to shallow depths (2 to 4.5 metres) in the vadose zone at three locations in the central portion<br />
of the site. Two design types were tested; the first type consisted of a modified ‘grout-liner’<br />
design, where a seal is created in the small diameter hole by injecting grout into a flexible<br />
cylindrical impervious fabric liner and the second type consisted of a modified packer. Both<br />
designs incorporate high integrity seals to allow for the versatility of active vapour sampling,<br />
as well as passive sampling using the Waterloo Membrane Sampler TM . Measurements of volatile<br />
organic contaminant (VOC) vapour concentrations in the vadose zone can be used for<br />
assessing the transport of contaminants in the fractures and the flux of contaminant concentrations<br />
from the vadose zone to ground surface. The efficiency of these small portable drills<br />
has allowed them to become a valuable tool to quickly install monitoring probes in bedrock<br />
for assessing VOC transport in fractured rock vadose zones.<br />
Groundwater/Surface Water Interaction 4<br />
Thursday October 29, 13:00 – 14:40<br />
Chair: Steven Berg<br />
Room: Strauss<br />
239 - Artificial sweeteners track septic system effluent in rural<br />
Ontario groundwater<br />
John Spoelstra<br />
Environment Canada, Burlington, Ontario, Canada & Department of Earth and<br />
Environmental Sciences - University of Waterloo, Ontario, Canada<br />
Natalie D. Senger & Sherry L. Schiff<br />
Department of Earth and Environmental Sciences - University of Waterloo, Ontario,<br />
Canada<br />
Susan J. Brown<br />
Environment Canada, Burlington, Ontario, Canada<br />
IAH-CNC 2015 WATERLOO CONFERENCE<br />
103
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