Assessing Monitored Natural Attenuation as a Remedy in Igneous Fractured Rock
Monday, October 2, 2017: 1:20 p.m.
Charles Schaefer, PhD.
,
CDM Smith, Edison, NJ
John N. Dougherty, PG
,
CDM Smith, Edison, NJ
Daniel Folan, Ph.D.
,
AECOM, Chelmsford, MA
Ernest Ashley, P.G.
,
CDM Smith, Boston, MA
Estimates of groundwater flow velocity, abiotic test results, and bedrock property data were used in the CRAFLUSH model to assess the natural attenuation of contaminants in groundwater in the crystalline fractured rock. The model results showed that natural attenuation can account for the significant decrease in the concentration of volatile organic compounds observed in groundwater between two transects of monitoring wells installed at the site. The two transects of wells were installed to estimate mass flux/mass discharge under ambient conditions in support of evaluation of groundwater remedies for the bedrock aquifer including monitored natural attenuation. Groundwater flow velocity was estimated using aquifer properties derived from borehole dilution tests, passive flux meters, test pumping, and potentiometric surface data. A bench scale test was conducted to assess the potential for abiotic degradation of trichloroethene in the bedrock aquifer Previously, bedrock at the site has been characterized using rock core, CORE DFN sampling to assess matrix diffusion, FLUTe liner transmissivity profile, Active Line Source (ALS) temperature logging, packer testing, borehole geophysical logging, heat pulse flowmeter logging, compound specific isotopic analysis, and wireline groundwater sampling.
Charles Schaefer, PhD., CDM Smith, Edison, NJ
Charles Schaefer is a Principal with CDM Smith out of the Edison, NJ office. He has a doctorate in chemical engineering from Rutgers University, and has nearly 15 years of industry experience. His research and publication efforts have focused on chlorinated solvents in fractured rock, bioremediation, and mass transfer processes.
John N. Dougherty, PG, CDM Smith, Edison, NJ
John Dougherty is a hydrogeologist with 28 years of experience in environmental consulting and has been working at CDM since 1999. At CDM he has been concentrating on hydrogeologic characterization of U.S. EPA Superfund sites in Region II. Many of these sites are situated in fractured bedrock terrain. He has experience in many aspects of site investigation, borehole geophysical investigations, and has designed and supervised the installation of monitoring wells at Superfund sites around the United States. Dougherty holds a B.S. in Geosciences from Pennsylvania State University.
Daniel Folan, Ph.D., AECOM, Chelmsford, MA
Daniel Folan is a former employee of the U.S. Geological Survey and is currently a certified Professional Geologist and Licensed Site Professional with over 20 years of experience in the environmental industry, specializing in hydrogeological investigations and contaminant geochemistry. He has managed and served as technical specialist on more than 300 hazardous waste management and remediation projects. Folan is knowledgeable in all methods of hydrogeologic investigation and has particular expertise in the characterization of fractured geologic media. He has worked on numerous complex fractured media projects around the country. Folan’s experience with groundwater flow modeling and contaminant geochemistry enables him to provide Conceptual Site Model (CSM) development expertise that can be used in litigation support, data gap evaluation, risk assessments, and remedial design. He holds a B.S. in Geology/Chemistry (double major) from Bridgewater State College and a Ph.D. in Geochemistry from the Colorado School of Mines.
Ernest Ashley, P.G., CDM Smith, Boston, MA
Ernest Ashley is a professional geologist with more than 30 years of experience specializing in hydrogeological and hazardous waste site investigations. He is a Licensed Site Professional in Massachusetts, a Licensed Environmental Professional in Connecticut, and an American Academy of Environmental Engineers Board Certified Environmental Scientist. He holds a B.A. in Geology from the University of Colorado and an M.S. in Engineering–Hazardous Materials Management from Tufts University. He is a consultant for several major industrial and defense corporations. Throughout his consulting career, Ashley has worked on sites with chlorinated solvents, mercury, MGP wastes, and other DNAPLs. He is involved with the Interstate Technologies Regulatory Council’s DNAPL Characterization team and with the University Consortium for Field-Focused Groundwater Research.
