Award Date

1-1-1993

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Geoscience

First Committee Member

Steve Mizell

Number of Pages

109

Abstract

A physical model was constructed to investigate the physical process of dewatering the filter-pack of a low-yield ground-water monitoring well and determine if this process effects the concentration of dissolved volatile organic compounds (VOCs). It was hypothesized that losses of VOCs would be observed as a result of an increased air-water interface and possibly turbulent flow through the filter pack during water-level recovery; Little or no measurable losses of 1,1,1-TCA, MCB, or 1,1,2,2-TET were detected during water-level recovery while simulating non-stagnant well conditions. These data imply that losses of VOCs due to volatilization resulting from the physical action of water reinfiltrating a dewatered monitoring well will be minimal; Stagnant well simulations resulted in a trend of increasing concentration with time during water-level recovery, reflecting the mixing of residual stagnant water in the filter pack and incoming fresh water. These results indicate that similar trends observed in field studies may have resulted from mixing stagnant water with incoming formation water.

Keywords

Concentrations; Dewatering; Evaluation; Filter; Low; Monitoring; Pack; Simulated

Controlled Subject

Hydrology; Environmental sciences; Geochemistry

File Format

pdf

File Size

3041.28 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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