Regional hydrogeology of Illusion and Spider Lake area
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In British Columbia, many aquifers occur in unconsolidated sediments prone to contamination and over-extraction. In the Nanaimo Lowlands, understanding of subsurface sediments is regionally constrained by the local stratigraphy, but at the local scale, the subsurface sedimentary architecture controlling groundwater flow often remains unclear. The primary aim of this project is to develop a hydrostratigraphic framework focused on identifying aquifers and aquitards for the area around Spider Lake, BC. Four cross-sections were developed based on government well record data on iMapBC, and are oriented in the NE-SW and NW-SE directions. Hydrostratigraphic units were constructed through interpretation of this data and the results were then standardized based on existing lithostratigraphic records. TopoDrive was used to determine groundwater flow paths and the DRASTIC method was then applied to assess contaminant vulnerability of each unique aquifer. From the gathered information we determined the location of aquifers and aquitards as well as the region’s vulnerability to contaminants.