Abstracts

collected can then be used to calculate hydraulic conductivity in the saturated zone. The
data collected is analyzed and displayed versus depth in real time up hole.
Each technology will be briefly discussed, and a case study will be presented where both
the MIP and the LIF were used prior to and during in situ remediation of PHCs. The
case study demonstrates how the site characterization tools were utilized to intelligently
alter the approach to work at the site. The 3D modeled renderings of the plumes will be
presented to show how the results were used to alter future remedial designs.
266 - Estimating specific storage of an aquifer using borehole
geophysics, barometric efficiency, and laboratory core testing
Polina Abdrakhimova, Laurence R. Bentley & Masaki Hayashi
Department of Geoscience, University of Calgary, Calgary, Alberta, Canada
A crucial parameter for groundwater management is specific storage, which relates changes
in hydraulic head to changes in the volume of water stored in a confined aquifer. In-situ
values of specific storage are conventionally estimated by analysing pumping test data based
on the idealized aquifer theory. However, in case of heterogeneous aquifers, this method
can result in unreliable estimates due to the violation of the ideal aquifer assumptions. An
example of heterogeneous aquifer is the Paskapoo Formation, which is characterized by
sandstone channels embedded in lower permeability mudstone and siltstone. Being the
most significant groundwater supply source in Alberta, its management requires reliable
characterization of hydrogeological properties.
An alternative approach to the estimation of specific storage is to use its relationship with
the formation’s elastic parameters, in particular the aquifer matrix compressibility. Aquifer
compressibility can be evaluated using Young’s modulus and Poisson’s ratio, which can be
derived from laboratory core testing or in-situ geophysical methods. It can also be estimated
by analysing water-level fluctuations due to the barometric effect. In-situ geophysical
methods include borehole vertical seismic profiling (VSP) and sonic logging. Continuous
borehole logs of compressional and shear wave velocity are used to calculate the distribution
of Young’s modulus and Poisson’s ratio along the profile, and estimate specific storage
distribution. The three methods produce estimates of specific storage at a variety of spatial
sampling scales. The comparison of these methods and their performance gives insights
into the characterization of complex fluvial aquifer systems.
301 - Versatile Monitoring Completions for Bedrock Vadose Zone
VOC Gas Sampling
Beth L. Parker & Amanda A. Pierce
G360 Centre for Applied Groundwater Research, University of Guelph, Ontario, Canada
Murray Einarson
Haley & Aldrich, Oakland, California, USA
102 IAH-CNC 2015 WATERLOO CONFERENCE