FY03 DNAPL Characterization of the A-14 Outfall

Riha, BD

Savannah River Site (S.C.)

关键词: Remedial Action;    Ground Water;    Organic Compounds;    Resistivity Surveys;    Site Characterization;   

DOI  :  10.2172/821127
RP-ID  :  WSRC-TR-2003-00540
RP-ID  :  AC09-96SR18500
RP-ID  :  821127

美国|英语

来源: UNT Digital Library

【 摘 要 】

Residual dense non-aqueous phase liquid (DNAPL) contamination continues to be one of the most challenging remediation and characterization problems at SRS and sites around the world. Chlorinated solvents were usually released as DNAPLs to/the subsurface where they move in an unstable fashion driven by gravitational and,capillary forces. They are often retained in small discrete blobs in fine grain materials in the vadose zone and contaminate ground water by slow continuous release through dissolution and diffusion. Locating these small sources is a difficult but crucial part of remediating a contaminated site. Several methods have been developed to locate subsurface DNAPL but nearly all are intrusive and can only identify DNAPL in close proximity to the access hole. Minimally invasive geophysical methods to locate residual DNAPL have been proposed and developed but few methods are capable of the spatial resolution required. Complex resistivity measurements sensitive to DNAPL (perchloroethylene) interactions with clay (smectite) have recently been shown to have promise in laboratory experiments. Based on these laboratory results, field tests of the complex resistivity technique were performed at the A-014 outfall.