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Offset vertical radar profiling

University of Oklahoma, Norman, U.S.

John Lane

U.S. Geological Survey, Storrs, Connecticut, U.S.

Corresponding author: awitten@ou.edu

The first 20% of the full text of this article appears below.

Microbial digestion of organic contaminants is an in situ means for bio remediation that is currently under development and evaluation. Vegetable oil has been proposed as an agent to stimulate the natural microbial community. This system becomes anaerobic as the vegetable oil is consumed providing the necessary conditions for metabolizing volatile organic compounds (VOCs). In order for this process to be effective in remediating groundwater contamination, the vegetable oil must be introduced into contamination either directly or by creating a "curtain" down gradient.

There are several ways in which such a remediation can fail. One of these is that the vegetable oil stimulant does reach the desired area. As part of a larger program to evaluate the efficacy of the above-cited form of in-situ bio remediation, geophysical techniques were employed to remotely characterize the spatial distribution of vegetable oil injected into a shallow unconfined aquifer. The site is a riverfront park on the eastern bank of the Mississippi River and immediately down gradient of known VOC contamination. Approximately 100 m from the river a closely spaced cluster of wells was developed. Three inline wells were used for vegetable oil injection and approximately 13 700 liters of vegetable oil/groundwater mix was introduced into these wells over a 3-m screened interval at a depth of approximately 8 m.

As part of this project, downhole radar, crosswell radar tomography, and vertical radar profiling (VRP) data sets were acquired for subsequent interpretation and processing. Here, the VRP aspect of the study is presented. In VRP, a receiving antenna is moved vertically in a well for an array of transmitting antenna positions arranged along a line on the ground surface radially outward from the receiver well. Many of the wells in the cluster were used for this purpose in the study. Unlike the more traditional . . . [Full Text of this Article]