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Assessing the Hydrogeological Properties Influencing Nitrate Distribution in a Shallow Unconfined Dolostone Aquifer and Supply Well Vulnerability

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dc.contributor.advisor Parker, Beth
dc.contributor.author Hommersen, James
dc.date.accessioned 2021-01-18T21:26:30Z
dc.date.available 2021-01-18T21:26:30Z
dc.date.copyright 2021-01
dc.date.created 2020-11-06
dc.identifier.uri https://hdl.handle.net/10214/23766
dc.description.abstract This study investigated an aquifer system in Halton Hills, Ontario, Canada where elevated concentrations of nitrate (NO3-) were detected in two municipal water supply wells since 2007. An investigation core hole was drilled 20 m from the supply wells following the Discrete Fracture Network-Matrix (DFN-M) field approach to evaluate local hydrogeologic conditions and vertical extent of NO3- in the bedrock. Quarterly groundwater sampling allowed for assessing the spatio-temporal hydrochemistry variability and isotope analysis provided insight on rates of denitrification and flow path distinction. Hydraulic testing on the multilevel system (MLS) required a novel setup and mathematical development to address friction and acceleration losses for unsteady oscillatory annular flow conditions to obtain transmissivity (T) estimates. This study expands upon the understanding of the local hydrogeologic flow system in comparison to the existing equivalent porous media (EPM) based regional conceptual site model (CSM) and presents a methodology for obtaining improved T estimates. en_US
dc.description.sponsorship Regional Municipality of Halton, NSERC Senior Industrial Research Chair Grant (No. IRCPJ 363783-11) en_US
dc.language.iso en en_US
dc.rights Attribution 4.0 International *
dc.rights.uri https://creativecommons.org/licenses/by/4.0/ *
dc.subject Nitrate en_US
dc.subject Groundwater en_US
dc.subject Slug Testing en_US
dc.subject Friction and Inertial Losses en_US
dc.subject Unsteady and Steady Flow en_US
dc.subject Annular Flow en_US
dc.subject Multilevel System en_US
dc.subject Fractured Bedrock en_US
dc.subject Transmissivity en_US
dc.subject GUDI en_US
dc.title Assessing the Hydrogeological Properties Influencing Nitrate Distribution in a Shallow Unconfined Dolostone Aquifer and Supply Well Vulnerability en_US
dc.type Thesis en_US
dc.degree.programme Environmental Sciences en_US
dc.degree.name Master of Science en_US
dc.degree.department School of Environmental Sciences en_US
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