Quarry Influences in Limestone Environments

Paleozoic limestones in Southern Ontario are laterally extensive and dip slightly into the Michigan Basin.  The competent limestone formations near ground surface tend to be characterized by laterally extensive conductive fracture planes created in part by glacial unloading.  These fracture planes provide local ground water resources for residents; but are not so well developed to yield significant water resources for large municipal supply.

The influence measured at various quarry developments cut into these limestone plains in Southern Ontario was assessed.  EPM estimates poorly reflect the inherent complexity and heterogeneity of a fractured rock environment.  This study evaluates the similarities and differences that exist at various quarry operations across a portion of Southern Ontario based on more recent instrumentation of various working sites.  The evaluation of actual site data is considered to provide a much more discerning evaluation than is possible through theoretical estimates.  The fractured bedrock setting was examined with the intent of identifying critical characteristics which tend to define the consistency in the outward influence on ground water flow as measured at numerous quarry sites in Southern Ontario.  The study also provides practical insights into the development of effective operational monitoring programs at these facilities which will safeguard domestic supplies in proximity to such operations.