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http://dx.doi.org/10.7857/JSGE.2014.19.3.111

An Experimental Study of the Effect of the Test-well Arrangement on the Partitioning Interwell Tracer Test for the Estimation of the NAPL Saturation  

Kim, Bo-A (Korea Institute of Geoscience & Mineral Resources (KIGAM))
Kim, Yongcheol (Korea Institute of Geoscience & Mineral Resources (KIGAM))
Yeo, In Wook (Department of Earth Systems and Environmental Sciences, Chonnma National University)
Ko, Kyung-Seok (Korea Institute of Geoscience & Mineral Resources (KIGAM))
Publication Information
Journal of Soil and Groundwater Environment / v.19, no.3, 2014 , pp. 111-122 More about this Journal
Abstract
Partitioning interwell tracer test (PITT) is a method to quantify and qualify a site contaminated with NAPLs (Non-Aqueous Phase Liquids). Analytical description of PITT assumes that the injection-pumping well pair is on the line of the ambient groundwater flow direction, but the test-well pair could frequently be off the line in a real field site, which could be an erroneous factor in analyzing PITT data. The purpose of this work is to study the influence of the angle of the test-well pair on the ambient groundwater flow direction based on the result from PITT. From the experiments, it was found that the obliqueness of the test-well pair to the ambient groundwater flow direction could affect the tracer test resulting in a decreased NAPL estimation efficiency. In case of an oblique arrangement of the test-well pair to the ambient flow direction, it was found that the injection of a chase fluid could enhance the estimation efficiency. An increase of the pumping rate could enhance the recovery rate but it cannot be said that a high pumping rate can increase the test efficiency because a high pumping rate cannot give partitioning tracers enough time to partition into NAPLs. The results have a implication that because the arrangement of the test-well pair is a controlling factor in performing and interpreting PITT in the field in addition to the known factors such as heterogeneity and the source zone architecture, flow direction should be seriously considered in arranging test-well pair.
Keywords
Partitioning interwell tracer test (PITT); Test-well arrangement; Chase fluid; NAPLs (Non-aqueous Phase Liquids); Pumping rate;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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