I certify that I have read this study and that in my opinion it
conforms to acceptable standards of scholarly presentation and is fully
adequate, in scope and quality, as a dissertation for the degree of
Doctor of Philosophy.





 Howard T. Odum, Chairman
 Graduate Research Professor of Environ-
 mental Engineering Sciences


 I certify that I have read this study and that in my opinion it
conforms to acceptable standards of scholarly presentation and is fully
adequate, in scope and quality, as a dissertation for the degree of
Doctor of Philosophy.





 Wayne CQ. Huber
 Associate Professor of Environmental
 Engineering Sciences



 I certify that I have read this study and that in my opinion it
conforms to acceptable standards of scholarly presentation and is fully
adequate, in scope and quality, as a dissertation for the degree of
Doctor of Philosophy.





 Suzann EE. Bayley /
 Assistant Professor of Environmental
 Engineering Sciences