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dc.contributor.authorKozuskanich, John C.
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2011-02-28 17:05:05.431en
dc.date2011-02-28 17:27:54.806en
dc.date.accessioned2011-03-01T18:18:03Z
dc.date.available2011-03-01T18:18:03Z
dc.date.issued2011-03-01T18:18:03Z
dc.identifier.urihttp://hdl.handle.net/1974/6329
dc.descriptionThesis (Ph.D, Civil Engineering) -- Queen's University, 2011-02-28 17:27:54.806en
dc.description.abstractGroundwater is an important resource that is relied on by approximately half of the world’s population for drinking water supply. Source water protection efforts rely on an understanding of flow and contaminant transport processes in aquifers. Bedrock aquifers are considered to be particularly vulnerable to contamination if the overburden cover is thin or inadequate. The objective of this study is to further the understanding of modeling, sampling, and the potential for anthropogenic contamination in fractured bedrock aquifers. Two numerical modeling studies were conducted to examine geochemical groundwater sampling using multi-level piezometers and the role of discretization in a discrete fracture radial transport scenario. Additionally, two field investigations were performed to study the variability of bacterial counts in pumped groundwater samples and the potential for anthropogenic contamination in a bedrock aquifer having variable overburden cover in a semi-urban setting. Results from the numerical modeling showed that choosing sand pack and screen materials similar in hydraulic conductivity to each other and the fractures intersecting the borehole can significantly reduce the required purge volume. Spatiotemporal discretization was found to be a crucial component of the numerical modeling of solute transport and verification of the solution domain using an analytical or semi-analytical solution is needed. Results from the field investigations showed fecal indicator bacterial concentrations typically decrease on the order of one to two orders of magnitude from the onset of pumping. A multi-sample approach that includes collection at early-time during the purging is recommended when sampling fecal indicator bacteria for the purpose of assessing drinking water quality. Surface contaminants in areas with thin or inadequate overburden cover can migrate quickly and deeply into the bedrock aquifer via complex fracture networks that act as preferential pathways. While the presence of fecal indicator bacteria in groundwater samples signifies a possible health risk through human consumption, it was the suite of pharmaceuticals and personal care products that allowed the identification of septic systems and agriculture as the dominant sources of contamination. Land-use planning and source water protection initiatives need to recognize the sensitivity of fractured bedrock aquifers to contamination.en
dc.languageenen
dc.language.isoenen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjecthydrogeologyen
dc.subjectnumerical modelingen
dc.subjectgroundwater samplingen
dc.subjectseptic system impactsen
dc.subjectfractured bedrock aquifersen
dc.titleAdvances in Modeling, Sampling, and Assessing the Anthropogenic Contamination Potential of Fractured Bedrock Aquifersen
dc.typeThesisen
dc.description.degreePh.Den
dc.contributor.supervisorNovakowski, Kent S.en
dc.contributor.supervisorAnderson, Bruceen
dc.contributor.departmentCivil Engineeringen


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