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Geoelectrical response of an aged LN...

Werkema, Douglas Dale, Jr.

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Geoelectrical response of an aged LNAPL plume: Implications for monitoring natural attenuation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Geoelectrical response of an aged LNAPL plume: Implications for monitoring natural attenuation./
Author:	Werkema, Douglas Dale, Jr.
Description:	136 p.
Notes:	Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4097.
Contained By:	Dissertation Abstracts International63-09B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3065412
ISBN:	0493842039

Geoelectrical response of an aged LNAPL plume: Implications for monitoring natural attenuation.
Werkema, Douglas Dale, Jr.

Geoelectrical response of an aged LNAPL plume: Implications for monitoring natural attenuation. - 136 p.

Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4097.

Thesis (Ph.D.)--Western Michigan University, 2002.

The geoelectric stratigraphy at a site impacted with light non-aqueous phase liquids (LNAPLs) is investigated for its link to natural biodegradation, its contribution to the conductive model for aged (i.e. mature) LNAPL contaminated sites, and the relationship to the natural hydrologic regime. The highest conductivities (lowest resistivities) were observed in portions of soils where LNAPL was in residual and free phase. Corroborating evidence from bacteria enumeration from soil close to the vertical resistivity probe (VRP) installations show orders-of-magnitude increase in both heterotrophic and oil degrading microbes at the depths where the conductivity was at a maximum. The coincidence of peak microbial populations with zones of high conductivity provides circumstantial evidence linking the anomalous high conductivity to microbial degradation of LNAPLs.

ISBN: 0493842039Subjects--Topical Terms:

535228
Geophysics.

Geoelectrical response of an aged LNAPL plume: Implications for monitoring natural attenuation.
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100 1 $a Werkema, Douglas Dale, Jr. $3 1953418
245 1 0 $a Geoelectrical response of an aged LNAPL plume: Implications for monitoring natural attenuation.
300 $a 136 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4097.
500 $a Adviser: Estella Atekwana.
502 $a Thesis (Ph.D.)--Western Michigan University, 2002.
520 $a The geoelectric stratigraphy at a site impacted with light non-aqueous phase liquids (LNAPLs) is investigated for its link to natural biodegradation, its contribution to the conductive model for aged (i.e. mature) LNAPL contaminated sites, and the relationship to the natural hydrologic regime. The highest conductivities (lowest resistivities) were observed in portions of soils where LNAPL was in residual and free phase. Corroborating evidence from bacteria enumeration from soil close to the vertical resistivity probe (VRP) installations show orders-of-magnitude increase in both heterotrophic and oil degrading microbes at the depths where the conductivity was at a maximum. The coincidence of peak microbial populations with zones of high conductivity provides circumstantial evidence linking the anomalous high conductivity to microbial degradation of LNAPLs.
520 $a A simple analysis using Archie's Law reveals that large pore water saturation and a large pore water conductivity enhancement is necessary to produce the VRP field results from the contaminated locations. These results support the conductive model at aged LNAPL contaminated sites due to the effects of enhanced mineral dissolution of the aquifer materials resulting from biodegradation of the contaminant mass.
520 $a Further comparison of the temporal conductivity variation and water table fluctuations are also presented. The VRP results suggest that the conductivity response is inversely related to water table elevations at locations of LNAPL contamination and directly related at the non-contaminated location.
520 $a Overall, this study demonstrates the potential of geoelectrical investigations as a tool for assessing the microbial degradation of LNAPL impacted soils. The results will guide biogeochemical investigations to discrete zones where, physical changes are occurring, and provide the basis for model calibration at sites with mature LNAPL contamination.
590 $a School code: 0257.
650 4 $a Geophysics. $3 535228
650 4 $a Hydrology. $3 545716
650 4 $a Environmental Sciences. $3 676987
650 4 $a Biogeochemistry. $3 545717
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710 2 0 $a Western Michigan University. $3 804473
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790 $a 0257
791 $a Ph.D.
792 $a 2002
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