An Integrated Approach to Site Characterization of a Fractured ....

Granitic Bedrock Aquifer in Southern CaliforniaSpeaker:
Mr. Theodore R Johnson III,
Hazardous Substances Engineering Geologist,
CalEPA, Cypress, CA.Abstract:Fractured granitic aquifers are one of the most challenging geologic environments to characterize and remediate. At great expense and countless hours of site investigation, fractured granitic sites remain geologically complex with a great deal of uncertainty regarding contaminant fate and transport. As the science and technologies develop we are gaining a better understanding as to the physical, hydrological, and chemical nature of fractured granitic bedrock aquifer systems. Successful characterization of fractured bedrock sites rely on effective integration of a number of effective basic investigative tools: Lineament analysis (macro view); structural mapping of fractures (micro view); surface (resistivity and seismic) and downhole geophysical tools; evaluation of corehole data; groundwater sampling; fracture inter-connectivity tests; and evolution of the Site Conceptual Model. These data are being used to generate site-specific interpretation models relating several independent rock properties (fracture orientation, aperture, density, etc.) to hydrologic properties of the fractured granitic aquifer system (permeability, storage, and water quality). This presentation provides a case history of an ongoing site characterization at a fractured-bedrock aquifer site where investigative techniques are effectively integrated using a combination of techniques to iteratively mold the Site Conceptual Model and ultimately lead to effective and efficient remedial alternative implementation.

Location: Kaprielian Hall (KAP) - reilian Hall, Room 209

Audiences: Everyone Is Invited

Contact: Evangeline Reyes