Electrical Impedance Tomography at the A-014 Outfall for Detection of DNAPL

Daily, W ; Ramirez, A

Lawrence Livermore National Laboratory

关键词: Sampling;    Soils;    Detection;    Contamination;    54 Environmental Sciences;   

DOI  :  10.2172/15004881
RP-ID  :  UCRL-ID-153535
RP-ID  :  W-7405-ENG-48
RP-ID  :  15004881

美国|英语

来源: UNT Digital Library

【 摘 要 】

Some laboratory studies (e.g., Olheoft, unpublished report 2001) have shown that the low frequency electrical properties of some soil minerals contaminated by dense non-aqueous phase liquid (DNAPL) may be sufficiently unique to make it possible to use electrical impedance tomography (EIT) to differentiate normal electrical heterogeneities of the subsurface from DNAPL contamination. The goal of this work is to determine if electrical impedance measurements of the soil and groundwater at a contaminated site can be used to detect the presence and map the distribution of DNAPL. The strategy for achieving this goal is to predict the presence and location of DNAPL from an appropriately processed data set taken at the A-014 outfall site at Savannah River Site, which is suspected of near-surface contamination, and then to compare those predictions with results of sample analysis from the same region. Complete agreement between the predictions and the sampling data will be strong (but not conclusive) evidence that DNAPL contamination alters the subsurface materials in a way that can be detected and mapped using low frequency electrical methods. A total lack of agreement will be interpreted to mean that electrical methods cannot at this time be used to locate contamination. The results will be used to make funding decisions about continuing development of EIT for DNAPL detection.