Accession Number : AD1000198


Title :   Demonstration of a Fractured Rock Geophysical Toolbox (FRGT) for Characterization and Monitoring of DNAPL Biodegradation in Fractured Rock Aquifers


Descriptive Note : Technical Report


Corporate Author : Department of Earth/Environmental Science Newark United States


Personal Author(s) : Slater,Lee ; Day-Lewis,Fred ; Robinson,Judy ; Johnson,Tim


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1000198.pdf


Report Date : 29 Sep 2015


Pagination or Media Count : 166


Abstract : The overall objective of this project is to demonstrate a method for characterization and monitoring of dense non-aqueous phase liquid (DNAPL) biodegradation (including free and dissolved phase) in fractured rock aquifers based on a fractured rock geophysical toolbox (FRGT). Specific technical objectives include demonstrations of (1) fracture network characterization using geophysical methods sensitive to fracture strike and dip patterns and spanning a wide range of measurement scales; (2) long-term, minimally invasive autonomous monitoring of proxies of the timing and extent of amendment delivery and/or DNAPL degradation in fractured rock using combined geophysical and geochemical measurements sensitive to biodegradation; (3) the application of informed inversion to produce estimates of fracture location, distribution, and orientation with better resolution than is currently possible with commercially available tools; and (4) identification and monitoring of geophysical attributes that are soft measures of progress of DNAPL biodegradation in fractured rock. The project team aims to demonstrate how such geophysically imaged soft hydrological information can be used to guide decisions regarding sampling frequency and duration. This effort will include comparison of dense 4D geophysical monitoring results with sparser (in time and space) point chemistry data in order to fully understand geophysical signatures of DNAPL amendment treatments and remediation processes.


Descriptors :   GROUNDWATER , ROCKS AND DEPOSITS , MONITORING


Subject Categories : Geology, Geochemistry and Mineralogy


Distribution Statement : APPROVED FOR PUBLIC RELEASE