EVENT DETAIL

Groundwater flow and constituent transport in fractured bedrock beneath a site can be challenging to interpret and make the development of a Conceptual Site Model (CSM) daunting. Further complicating the situation are the effects of pumping from a nearby wells, variation in groundwater recharge, effects of regional bedrock configuration on groundwater flow, and discharge to surface water proximate to the site. These types of conditions were encountered during the investigation of two former industrial facilities, where past operations resulted in historical releases of dense non-aqueous phase liquid (DNAPL) to bedrock. In order to understand site bedrock hydrogeology and formulate a reliable CSM, coring, geophysical, and groundwater quality data were collected from the subject sites to fit the data together into a comprehensive CSM. The presentation will discuss how the resulting CSMs for these two sites provided a framework for assessing impacts to potential receptors, initiate remediation, and position these sites for closure.