Monitored natural attenuation is a cost-effective remediation strategy for the risk reduction of chemicals of concern (CoCs) in contaminated land and waters. This study considers three genuine sites in Germany, undergoing remediation. The objective was to measure a suite of physicochemical and biological parameters, and characterise the sites based on these data. The sites differed by their prevalent type of CoC, with one site impacted by polycyclic aromatic hydrocarbons (PAH), and two sites, situated in Hilden, impacted by BTEX. Sampling of microorganisms was performed using the industrial partner's newly developed matrix. This matrix was used for measurements of microbial respiration rate, ATP content, and 14C mineralisation rate, while groundwater samples were used for microbial luminescent biosensor assays (applying Escherichia coli HB101 pUCD607, Pseudomonas putida F1 Tn5, and Pseudomonas putida F1 TVA8), and for the chemical analysis of CoC, nitrate, iron, manganese, sulphate, and phosphate concentration. Microbial biosensors and respiration tests performed well in the identification of BTEX impacted wells at the Hilden sites, while the results for ATP content and 14C mineralisation were more ambiguous. Factor analysis showed a high impact of sulphate concentration. However, several strong correlations existed between measured parameters, so no single driving force, but a set of environmental influencing factors could be identified at the sites. The remediation progress could be demonstrated by the changes in cluster analyses between two time points. Sulphate and redox potential, the most influential parameters of the Hilden physico-chemical data set, were highlighted and confirmed by multiple linear regression, using a calculated attenuation rate as the dependent variable. Based on this outcome, a reduced sampling regime was proposed. This approach has the potential to reduce sampling costs and time at hydrocarbon contaminated sites, and has adequately demonstrated the use of statistical methods in assessing the remediation progress at a site.

Thesis (Ph.D.)--University of Tulsa, 1991. / Bibliography: leaves 239-249.

Thesis (Ph.D.). / Written for the Dept. of Mining, Metals and Materials Engineering. Title from title page of PDF (viewed 2008/05/12). Includes bibliographical references.

Thesis (M.S.)--California Polytechnic State University, 2009. / Mode of access: Internet. Title from PDF title page, viewed on March 30, 2009. Major professor: Yarrow Nelson, Ph.D. "Presented to the Electrical Engineering Department Faculty of California Polytechnic State University, San Luis Obispo." "In partial fulfillment of the requirements for the degree of Master of Science in Civil and Environmental Engineering." "March 2009." Includes bibliographical references (p. 133-140). Will also be available on microfiche.

Thesis (Ph. D.)--University of Washington, 1993. / Vita. Includes bibliographical references (leaves 243-254).

Thesis (M. Sc.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 75-77).

Thesis (M.S.)--Brigham Young University. Dept. of Civil and Environmental Engineering, 2007. / Includes bibliographical references (p. 45-47).

Thesis (Ph. D.)--University of Texas at Austin, 1998. / Vita. Includes bibliographical references (leaves 135-139). Available also in a digital version from Dissertation Abstracts.

Thesis (M.S.) in Ecology and Environmental Science--University of Maine, 2003. / Includes vita. Includes bibliographical references (leaves 159-167).

This dissertation consists of three chapters discussing the effects of changing trade barriers for Canadian firms and a final chapter investigating hazardous waste trade, one of the important environmental issues in international business. The first three chapters use simple theoretical structures and firm level data to examine the evolution of Canadian manufacturing following the tariff changes imposed by the Canada-US Free Trade Agreement. Chapter one considers the influence of falling tariffs on firm survival, chapter two investigates how trade liberalization effects firm growth in terms of size and productivity, and the third chapter considers the implication o f falling trade barriers for firm financial structure. The fourth chapter diverges from the first three to explore the determinants of international shipments in hazardous waste using a gravity model with factor endowment conditions and waste trade data from 89 countries. / Business, Sauder School of / Graduate