November 6, 2017 (DRAFT - pending approval)
March 23, 2017
November 3, 2016
April 14, 2016
November 3, 2015
December 9, 2014
January 21, 2014
December 5, 2013
April 30, 2013
September 17, 2012
June 22, 2012
November 7, 2011
June 23, 2011
September 27, 2010
March 2, 2010
March 24, 2009
February 26, 2009
January 27, 2009
April 15, 2008
April 19, 2007
May 5, 2006
February 17, 2005
March 18, 2004
December 17, 2003
November 21, 2002
March 19, 2002
May 16 ,2001
November 29,2000
May 2, 2000
February 10, 2000
December 7, 1999
August 20, 1999
March 23, 1999
April 30, 1998
January 8, 1998
April 23, 1996


Spring 2002 Colloquium Series:

Time: Monday January 14, 2pm
Location: FAB 105
Title: "The Virtual Museum of Minerals and Molecules"
Speaker: Phillip Barak, Associate Professor, Department of Soil Science, University of Wisconsin-Madison
Sponsor: Soil and Water Science Dept.

Time:  Thursday Jan 17, 3pm
Location: 122 Rogers Hall
Title: The validity of the Hazen-Williams Formula
Speaker: Richard Scholtz, Graduate Research Assistant
Sponsored by:  Dept of Agricultural & Biological Engineering

Time:  Wednesday Feb 13, 11:45am
Location:  Phelps Lab Conference Room
Title: Beyond Economics, The case for protecting the Ocean Wilderness
Speaker:  David White, Regional Director, The Ocean Conservancy
Sponsored by:  Center for Wetlands

Time:  Friday Feb 15, 3:30pm
Location:  Chandler Auditorium located in the Samuel P. Harn Museum of Art, on S.W. 34th Street and Hull Road.
Title: "On the State-of-the-Art of Finite Element Procedures and a Meshless Technique".
Speaker:  Dr. Klaus-Jurgen Bathe, Professor of Mechanical Engineering, Massachusetts Institute of Technology
Sponsored by:  Department of Civil and Coastal Engineering

Time:  Wednesday Feb 20, 11:45am
Location:  Phelps Lab Conference Room
Title: Using Soil Biogeochemcial Indicators for Wetland and Watershed Assessment
Speaker:  Dr. Bill DeBusk, Soil and Water Science Dept.
Sponsored by:  Center for Wetlands

Time:  Wednesday March 20, 11:45am
Location:  Phelps Lab Conference Room
Title: Large-scale Wetland Restoration in the Kissimmee River Watershed
Speaker:  Dr. Doug Shaw, The Nature Conservancy
Sponsored by:  Center for Wetlands

Time:  Wednesday March 27, 11:45am
Location:  Phelps Lab Conference Room
Title: Wetalnds, Resource Exploitation and International Environmental Law: A Case Study from Central America’s Largest Wetland
Speaker:  Dr. Tom Ankersen, Center for Governmental Responsibility, UF
Sponsored by:  Center for Wetlands

Time:  Wednesday April 10, 11:45am
Location:  Phelps Lab Conference Room
Title: Remote Sensing Applications in Wetland Vegetation and Stress Assessment
Speaker:  Dr. John Craig, 3001 Inc., Gainesville, and Dr. Jack Jordan, Dept of Ag&Bio Eng.
Sponsored by:  Center for Wetlands

Time:  Wednesday April 17, 11:45am
Location:  Phelps Lab Conference Room
Title: Historical Patterns of Sediment and Nutrient Accumulation in the Upper St. Johns River Basin
Speaker:  Dr. Mark Brenner, Land Use and Environmental Change Institute and Dept. of Geological Sciences
Sponsored by:  Center for Wetlands

Time:  Wednesday April 24, 11:45am
Location:  Phelps Lab Conference Room
Title: Challenges and Opportunities for Restoring Wetlands on Florida’s Cattle Ranches
Speaker:  Dr. Patrick Bohlen, Archbold Biological Station
Sponsored by:  Center for Wetlands

Fall 2001 Colloquium Series:

Date:  September 6th 2001
Title:  Soil and Water Science/HSAC Graduate Student Forum
Time: 8:30-6pm  (8:30-11am faculty presentations, 11-3pm student oral presentations, 3-6 student poster presentations)
Location:  282 Reitz Union
Sponsored by the Soil and Water Science Dept.

Date:  September 21st 2001
Time: 1:30pm
Speaker:  Dr. Mike Nordland, Everglades National Park
Title:  Restoration of the Hole in the Doughnut in Everglades National Park
Location:  G086 McCarty Hall
Sponsored by the Soil and Water Science Dept.

Date:  September 27th 2001
Time: 3pm
Speaker:  Dr. Venkat Lakshmi, University of South Carolina
Title: Assimilation Methods in Hydrologic Modeling.
Location:  440 Computer Science and Engineering Building
Sponsored by the Civil Engineering Dept and the Center for Natural Resources

Date October 9, 2001
Time: 4pm
Speaker: Gregory A. Kiker, Ph.D., School of Bioresources Engineering and
Environmental HydrologyUniversity of Natal-Pietermaritzburg South Africa, and Kenneth L. Campbell,
Ph.D., Department of Agricultural and Biological Engineering, UF.
Title: Design and Validation of an Object-Oriented/Java Hydrologic Modeling System
Location: 122 Rogers Hall
Sponsored by the Agricultural and Biological Engineering Dept.

Date October 16, 2001
Time: 4pm
Speaker: Gregory A. Kiker, Ph.D. School of Bioresources Engineering and Environmental Hydrology University of Natal-PietermaritzburgSouth Africa and Kenneth L. Campbell, Ph.D., P.E.
Title: Elephants, Plants, and Phosphorus: Expanding Functionality of an Object-Oriented/Java Environmental Modeling System
Location: 122 Rogers Hall
Sponsored by the Agricultural and Biological Engineering Dept.

Date: October 19th 2001
Time: 4pm
Speaker: Dr. Jeremy Semrau, Associate Professor, University of Michigan
Title: Genetic studies of methanotrophic bacteria
Location: 100NEB
Sponsored by the Environmental Engineering Sciences Dept.

Date:  November 14th, 2001
Time: 4 pm
Speaker: Dr. Robin L. Brigmon, Environmental Biotechnology Section, Westinghouse Savannah River Company, Aiken, South Carolina
Title: Phytoremediation Of Chlorinated Ethenes At The Savannah River Site
Location: 100NEB
Sponsored by the Environmental Engineering Sciences Dept.

Date:  November 27th, 2001
Time: 3:30 pm
Speaker:  Dr. Mary Hill, U.S. Geological Survey, Denver Colorado, NGWA Darcy Lecturer
Title: Guidelines For Effective Model Calibration (Any Model!)
Location: 282 Reitz Union
Sponsored by the NGWA Darcy Lecture Series, the Center for Natural Resources and the Agricultural and Biological Engineering Dept.

Upcoming Lectures (To be scheduled):

Professor Philip B. Bedient
Department of Environmental Science & Engineering
Rice University, Houston, Texas
Title: TBA
Sponsored by:  Environmental Engineering Sciences

Dr. Douglas T. Shaw
The Nature Conservancy
Gainesville, Florida
Title: TBA
Sponsored by:  Environmental Engineering Sciences





Spring 2001 Colloquium Series:

Hydrologic Sciences Academic Concentration Colloquium
Spring 2001 Tentative Agenda

Time: February 14th, 4pm
Location: 285 Reitz Union
Title: Effects of Paper Mill Effluents on Fish Reproduction
Speaker: Maria S. Sepulveda, Ph.D, USGS-BRD Florida Carribbean Science Center
Co-sponsors: Center for Natural Resources and Center for Environmental and Human Toxicology

Time: Thursday Feb 22, 1:55pm
Location: New Engineering Building Room 100
Title: Origins and Fates of Natural Organic Compounds in Natural Waters: Importance of Photodegradation
Speaker: Dr. Robert Wetzel,Univ of Alabama
Sponsored by: Dept. of Env. Eng. Sciences

Time: Wed April 11, 4pm
Location: 285 Reitz Union
Title: Lake Apopka- the pitfalls of forensic toxicology
Speaker: John Shell, BB&L Sciences
Co-sponsors: Center for Natural Resources and Center for Environmental and Human Toxicology

Time: Friday, April 13, 2001 4:00 P.M.
Location : Little Hall, Room 101
Title: TBA
Speaker: Dr. Steve Wheatcraft,Univ of Nevada Reno
Sponsored by: Dept. of Env. Eng. Sciences

Time: Monday, April 16, 2001 11:45 A.M.
Location : NEB 101
Title: Adventures in Bioremediation
Speaker: Dr. Michael Barcelona, University of Michigan
Sponsored by: Dept. of Env. Eng. Sciences

Plus.... 3 candidate seminars for the vadose zone hydrologist to replace Suresh Rao's position.
Date and time TBA.

Fall 2000 Colloquium Series:

Thursday September 21, 2000

Topic: Ecosystem Characterization and Monitoring for DOD Lands.
Speaker: Dr. Rose Kress, Physical Scientist
US Army Engineering Research and Development Center Environmental Laboratory
Vicksburg, MS
Time: 1:15pm
Location: 282 Reitz Union

Co-sponsored by Soil and Water Science Dept. and the Center for Natural Resources

Monday, September 25, 2000

Topic: Radar-Rainfall Analysis in Florida
Speaker: Dr. David Curtis, President NEXRAIN Corporation
Time: 4:05 pm
Location: Weil 334

Co-Sponsored by the Department of Civil and Coastal Engineering and the Water Resources Research Center

Friday October 6, 2000

Topic: Wetlands Hydrology
Speaker: Dr. Wayne Skaggs
William Neal Reynolds and Distinguished University Professor
Dept. of Biological and Agricultural Engineering
North Carolina State University
Raleigh NC
Time 10:30am
Location: 286 Reitz Union

Co-sponsored by the Dept. of Ag. And Bio. Eng and the Center for Natural Resources

Friday October 13, 2000

Topic: Mercury Cycling in the Everglades: A Harmonic Convergence of Atmosphere and Terrestrial Environmental Insult?
Speaker: Dr. Curtis Pollman
TetraTech, Inc.
408 W. University Ave., Suite 201
Time: 1:30pm
Location: G086 McCarty Hall

Co-sponsored by Soil and Water Science Dept. and the Center for Natural Resources

Friday October 27, 2000

Topic: Lake Apopka Restoration
Speaker: Dr. Ed Lowe, Director
Division of Environmental Services
St. Johns River Water Management District
Palatka, FL 32178-1429
Time: 1:30pm
Location: G086 McCarty Hall

Co-sponsored by Soil and Water Science Dept. and the Center for Natural Resources

Wednesday November 15, 2000

Topic: Using Decision Support Models to Evaluate the Ecological, Economic and Environmental Impacts of Alternative Land and Water Management Practices

Presented by: Dr. Pete Loucks
Dept. of Civil and Environmental Engineering
Cornell University
Ithaca, NY
Time: 1:30pm
Location: 285 Reitz Union

Co-sponsored by the Center for Natural Resources



Past Lectures

Yan Dong Ph.D. Exit Seminar; Lena Ma"Colloid-facilitated heavy metal mobility in soil" Tuesday, April 20, 1999 3:30 p.m., G086 McCarty Hall Contact Andrew Ogram 392-1951

Dr. Claire SchelskeDepartment of Fisheries and Aquatic Sciences, University of Florida  "Sediment and Nutrient Deposition in Lake Apopka: Historical Insights"Tuesday, March 30, 1999 3:30 p.m., G086 McCarty HallContact Andrew Ogram 392-1951

Patrick BohlenMacArthur Agro-Ecology Research Center Lake Placid, FloridaTitle TBA Tuesday, April 6, 19993:30 p.m., G086 McCarty Hall Contact Andrew Ogram 392-1951

Dr. John TschirhartDepartment of Economics, University of Wyoming  "General Equilibrium of an Ecosystem"  Monday, March 1, 1999 10:30 a.m., 1151 McCarty Hall  Professor Tschirhart is currently Professor of Economics and Director of the Public Utility Research and Training Institute (PURTI) at the University of Wyoming.  He has written extensively on public utility regulation and environmental economics including papers in the American Economic Review, the Journal of Law and Economics, the Journal of Political Economy, Land Economics, and the Review of Economics and Statistics.  His 1988 book Natural Monopoly Regulation: Principles and Practice (with Sanford Berg from UF) has been used at numerous universities and regulatory agencies.  His research has been supported by the U.S. Environmental Protection Agency, the U.S. Geological Survey, the National Science Foundation, and the American Water Works Association.  In addition, Professor Tschirhart has worked on a number of domestic and international consulting projects.

Copies of the paper will be available - contact Wally Milon at milon@fred.ifas.ufl.edu.

  Dr. Stuart Rojstaczer Director, Center for Hydrologic Sciences, Duke University  "Truly Useful Prediction of Subsurface Contaminant Transport: Can We Ever Have Enough Data?"  Thursday, March 4, 1999 3:30 p.m., 285 Reitz Union    Dr. Rojstaczer is the GSA Birdsall-Dreiss Distinguished Lecturer for 1999.  For more information, contact Dr. Wendy Graham atgraham@agen.ufl.edu.

Dr. Patricia ClineCH2M Hill, Gainesville"Redevelopment of Contaminated Land: Chemical Fate, Risk Analysis &Innovative Engineering Solutions" Tuesday, February 23, 19993:30 p.m., G086 McCarty Hall

Herbert FredricksonUSACE Waterways Experiment Station, Vicksburg, MS  "Relating Biodegradation Potentials to In-SituMicrobial Community Characteristics"  Friday, February 12, 1999 10:00 a.m., 1151 McCarty Hall   Abstract:
We used a 50-year-old diesel fuel oil contamination plume to test the hypothesis that attributes of the extant microbiota (i.e. biomass, activity and/or community composition) could be directly related to chemical evidence for the occurrence of hydrocarbon (TPH) biodegradation.  The study site was located in Fort Drum’s “Gasoline Alley” where leaking underground fuel storage tanks and refueling activities resulted in the formation of a subsurface diesel fuel contamination plume.  The contamination was estimated to cover an area of approximately 3,000 cubic yards and reach concentrations as high as 10,000 µg g-1.  A continuous surface to groundwater (5 m) core was collected from near the center of the contamination plume and sampled every 5 cm.  Co-recovery of petroleum hydrocarbons and bacterial membrane phospholipids was achieved in a single organic solvent extraction.  Microbial membrane ester-linked phospholipid fatty acids (PLFA) and TPH were detected throughout the depth profile.  The predominant PLFA detected were monounsaturates (~74% of the total) typical of Gram-negative bacteria.  Two areas (1.8-2.0 m and 3.1-3.5 m) within the capillary fringe zone showed a three-fold decrease in the ratio of hexadecane to pristane, a chemical indication of past and/or present biodegradation activity.  14C-phenanthrene mineralization was measured from newly recovered soils, confirming that the indigenous populations possessed the ability to mineralize a relatively recalcitrant TPH component. This finding was verified by the detection of genes encoding for an alkane-degrading enzyme (alk B) in the same sample. Phospholipid fatty acid patterns from samples collected in these same two areas, were similar to each other and significantly different from those where the hexadecane/pristane ratio was high and monounsaturated PLFA were predominant. This shift in the extant microbial community composition was attributable to increases in percentages of micro-eukaryotic (polyunsaturate), actinomycete (10-methyl branched saturate) and Gram-positive (terminally methyl branched saturate) PLFA biomarkers.  In summary, TPH levels and rates of TPH degradation were greatest within the capillary fringe zone of an otherwise homogenous subsurface soil matrix. These localized subsurface areas with high rates of TPH degradation generally contained higher levels of microbial biomass and a unique microbial community composition comprised of aerobic heterotrophs, i.e. fungi, actinomycetes and/or Gram-positive bacteria, were related to the biodegradation of the fuel hydrocarbons. This data could be used to provide evidence for an ongoing process of TPH natural attenuation.

Dr. Amelia KivaisiAssociate Professor, Botany Dept., University of dar es Salaam, Tanzania "Lake Victoria: An Ecosystem Under Stress"  Friday, February 5, 1999 3:30 p.m., G086 McCarty Hall

  David CarterFood and Resource Economics DepartmentUniversity of Florida "The True Cost of Water - Beyond the Perceptions"  Thursday, January 28, 1999 3:00 p.m., 349 Reitz Union   Abstract:

This study reviews the "true cost" of water in the Florida setting and examines the prospect of using water service prices to encourage efficient water resource conservation that prevents further environmental problems and postpones the development of costly new supplies.  At issue is whether existing pricing policies are signaling efficient water use decisions, considering the resource protection directives set forth by the water management institutions.  A simulation of water pricing in the Tampa Bay region shows that water service is or will be underpriced (relative to resource opportunity costs) in the next thirty years if the current pricing practices are maintained.  The analysis also presents the potential benefits available from a switch to efficient pricing strategies.

NUCLEAR MAGNETIC RESONANCE PROBES OF FLUIDSAND FLOW IN POROUS MEDIA Dr. A. Ted Watson,Professor, Department of Chemical Engineering &Director, Engineering Imaging Laboratory Texas A&M University, College Station, TX  Time & Place: January 22, 1999 (Friday); 9 - 10:30 am Room 386; New Engineering BuildingEnvironmental Engineering Science Dept. Contact:Dr. Suresh Rao Soil & Water Science Departmentph: 846-2009 e-mail: pscr@ifas.ufl.edu


The description of multiphase flow in porous media is important for many industrial processes, including the production of fluids from petroleum reservoirs and environmental remediation. Key challenges arise from the heterogeneous and disordered nature of porous  media and the lack of effective probes to discern important features  concerning internal media structures and fluid distributions.

Nuclear magnetic resonance (NMR) imaging and spectroscopic methods can provide unprecedented information concerning fluid and flow distributions and rock/soil structures at both the microscopic (or pore-level) and macroscopic(locally-averaged) scales. The Engineering Imaging Laboratory has fostered research directed to the development of NMR methodologies for probing fluids and flow in porous media. I will present NMR methods for determining various microscopic and  macroscopic properties, and for observing  fluid flow velocities, for single and multi-fluid systems.

Monday, October 5, 1998
Dr. Mark T. Brown, UF Environmental Engineering Sciences
“Ecological Engineering”
4:05 p.m, 100 NEB

Tuesday, October 6, 1998
Dr. Abe Goldman, UF Geography
“A Social Science Perspective on Sustainability in African Agriculture”
3:30 p.m., G186 McCarty Hall

Monday, October 12, 1998
Dr. Michael D. Annable, UF Environmental Engineering Sciences
“Strategies for In-Situ Flushing Remediation of  Subsurface Contamination”
4:05 p.m., 100 NEB

Monday, October 19, 1998
Dr. Allan Ford, Monsanto (retired)
"Industrial Management of the Environment”
100 NEB, 4:05 p.m.

Monday, October 26, 1998
Ms. Ann Forstchen FDEP
Title TBA
100 NEB, 4:05 p.m.

Friday, October 30
Dr. Bill Rixey,William G. Rixey, Department of Civil and Environmental Engineering,University of Houston
"Multi-Component Equilibrium Dissolution of Aromatic Compounds from Residually Trapped Hydrocarbon Mixtures"
Location and Time TBA.

Tuesday, November 3, 1998
Dr. Aaron Mills, Dept. Biology, University of Virginia
“Bacterial Transport Through Porous Media”
G186 McCarty Hall, 3:30 p.m.

Monday, November 9, 1998
Dr. Gabriel Bitton, UF Environmental Engineering Sciences
“On the Road to Morocco with MetPAD”
100 NEB, 4:05 p.m.

Tuesday, November 10, 1998
Gerco Hoogeweg, UF Soil and Water Science Ph.D. Student
Exit Seminar, Title TBA
G186 McCarty Hall 3:30 p.m.

Monday, November 16, 1998
Ms. Laura Sacks, USGS, Tampa, FL
“Estimating Groundwater Exchange with Central Florida Lakes”
100 NEB, 4:05 p.m.

Tuesday, November 17, 1998
Randy Sillan, UF Soil and Water Science Ph.D. Student
Exit Seminar, Title TBA
G186 McCarty Hall, 3:30 p.m.

Thursday, November 19, 1998
William Davis, Waterways Experiment Station, Vicksburg, MS
“Rapid Determination of Volatile Organic Compounds in Groundwater and Soil Using Direct Push Sampling / Direct Sampling Ion Trap Mass Spectrometry”
328 Weil Hall, 4:05 p.m.


Characterization of subsurface contaminants is time consuming and costly.  The Tri-Service Site Characterization and Analysis Penetrometer System  (SCAPS) has been developed to reduce the time and cost required for site characterization.  SCAPS consists of a standard geophysical cone penetrometer fitted with probes designed to sense subsurface contaminants. SCAPS probes have been designed to detect specific classes of contaminants including petroleum products, explosive compounds, heavy metals, and volatile organic compounds (VOC).  This talk describes techniques that are capable of sampling VOCs in situ from soils and groundwater and analyzing the VOC contaminant concentrations in real time using a field portable direct sampling ion trap mass spectrometer (DSITMS).  The direct push sampling techniques interfaced to the DSITMS have been demonstrated to collect VOC concentration data that allow rapid determination of the extent of subsurface contamination.  The precision and accuracy of the DSITMS are comparable to laboratory based analytical systems used to determine VOC concentrations in soil and groundwater.   Detection limits for the combined sampling and analytical procedures are generally at or below regulatory action levels for most VOC analytes in either soil or groundwater.  The techniques discussed are in varying stages of development from completed/transitioned for production work to early development. Sensor systems in the former state of development have been demonstrated to provide rapid, cost saving site characterization of subsurface VOC contamination.


Dr. Davis received his B.S. degree in Chemistry (1976) from Florida State University.  He received his M.S. degree in Analytical Chemistry (1985) from Florida State University and his Ph.D. degree in Water Chemistry (1993) from the Environmental Sciences and Engineering Department at the University of Florida.  For his Ph.D. research, Dr. Davis specialized in the application of sophisticated analytical chemistry to investigate the interaction of pollutants with natural matrices.  Dr. Davis is presently a Research Chemist with the Ecosystem Processes and Effects Branch, Environmental Laboratory, Waterways Experiment Station (WES).  During his tenure at WES, he has participated in basic research on the fate of explosives and hydrophobic contaminants in soils and sediments. Dr. Davis has been a principal participant in the Site Characterization and Analysis Penetrometer System Program developing sensors for in situ detection of explosives and volatile organic compounds in both soil and groundwater.

Tuesday, December 15, 1998
Ilker Uz, UF Soil and Water Science M.S. Student
Exit Seminar: “Characterization of the PAH-Metabolizing Bacterial Strain Rhodococcus opacus M213”
G186 McCarty Hall, 3:30 p.m.

Dr. Jim StevensonChief of Public Lands ManagementFlorida Department of Environmental Protection  Protecting the Water Quality of Ichetucknee Springs:A Watershed Working Group Process Monday, July 27, 199811:00 a.m., New Engineering Building Room 386  For more information, please contact Dr. Angela Lindner at 846-3033.  This work was nationally televised on the A&E program, The New Explorers, which is hosted by Bill Kurtis.  In this one-hour program, entitled "Polluting the Fountain of Youth," the growing concern of contaminants, such as nitrates, pesticides, and coliform bacteria, in this extended water system is discussed along with dye tracing studies performed in the Ichetucknee Basin.


The Ichetucknee Springs and River is probably the most pristine spring and river system remaining in Florida.  The Ichetucknee is a National Natural Landmark and an Outstanding Florida Water.  It is one of the crown jewels of the Florida State Park system and is the premier tubing river in the United States.  Nearly 200,000 visitors a year enjoy the springs and river, generating an estimated $1.7 million a year for the local economy.  Many old timers were baptized in the springs, and several local families continue to have their family reunions there.  All of these natural, recreational, economic, and social values depend upon the clear, clean waters that flow from the seven springs in the park.

In 1995, concern about the future quality of the spring water led to formation of the Ichetucknee Springs Water Quality Working Group.  The working group is composed of all federal, state, regional, and local agencies that have responsibilities in, or knowledge about, the Ichetucknee Basin.  Other member stakeholders include local citizens, private landowners, educators, businesses, and environmental organizations.  The working group has been gathering information about the basin from past studies, new research, and interviews with old timers to help discover the origin of the spring waters and the threats to water quality.

Dye tracing studies in the Ichetucknee Basin have proven that Rose Sink, located six miles north of the park, is connected to the springs at Ichetucknee.  The 10-mile-long Rose Creek flows into Rose Sink and its water reappears in the springs.  The working group believes that the waters of Alligator Lake, Cannon Creek and Clayhole Creek, which drain into sinkholes, also flow through a cave system that connects with the Ichetucknee.  These creeks receive contaminated stormwater run-off from urban and agricultural areas in the basin.

Monitoring of water, sediments and fish tissue from the springs and sinkholes in the basin indicates that the waters in the springs are still in relatively good condition.  However, contaminants are documented, including nitrates in the spring water, pesticides in the fish in the river, hydrocarbons in the sediments in sinkholes, and coliform bacteria in the creeks.

The working group is using all the tools in the ecosystem management tool box - education, research, monitoring, land acquisition, agricultural incentives, land use planning, regulations, and enforcement.  Emphasis has been on educating local officials and residents of the Ichetucknee Basin through slide programs, public meetings, field trips, news articles and a nationally televised program.

 Protection activities for the Ichetucknee include:
- building stormwater retention ponds,
- establishing vegetative buffers along streams,
- protecting sinkholes from refuse dumping,
- reducing the use of pesticides and fertilizers,
- reducing septic tank impacts along the Ichetucknee Trace,
- eliminating leaking gasoline tanks,
- removing trash from the creeks,
- purchasing sensitive lands for water quality protection,
- monitoring water quality, and
- conducting research to better understand the source of spring water.

  Jay W.Yingling Senior EconomistSouthwest Florida Water Management District Measuring the Economic Impact of Sustainable Water Resource Use: The Case of Minimum Flows and Levels in Northern Tampa Bay Sponsored By Food and Resource Economics DepartmentHydrologic Sciences Academic Concentration  Tuesday, April 7, 1998 3:00 p.m., Reitz Union Room 324  More Information:  392-1826 x430

Dr. Barbara Sherwood LollarDept. of Geology, University of Toronto  Stable Carbon Isotopes: A Tool for Detection of the Origin  and Fate of Environmental Contaminants  1998 HENRY DARCY DISTINGUISHED LECTURE Wednesday, March 4, 19983:00 p.m., Reitz Union Room 286

Prof. Lollar will be available to meet with any interested HSAC members at 2 p.m. on Wednesday, March 4, before her talk at 3 p.m.  She will be in room 286 of Reitz Union.  Please feel free to drop by.  Abstract

Contamination of groundwater with both non-chlorinated hydrocarbons (toluene, methane, etc.) and chlorinated solvents is widespread in both rural and urban settings and represents one of the most urgent challenges facing environmental scientists, industrial interests, government regulators and society.  Assessment and remediation of contaminated sites in an efficient and cost effective way requires a fundamental understanding of both the source of the pollutants and their transport and fate in the subsurface.

Stable carbon isotope analysis provides an innovative means of evaluating the origin and subsurface behavior of the dissolved organic contaminants.  Carbon-bearing compounds may enter the subsurface with a distinct isotopic composition (13C/12C ratio) characteristic of their source.  Provided that this isotopic signature is conserved, stable isotope analysis can be used to identify different sources of a given compound.  In contrast, in situations where carbon isotopic signatures are non-conservative and are altered in recognizing patterns by subsurface processes acting on the compounds of interest, important information about attenuation mechanisms can be obtained.

Due primarily to the low concentrations at which dissolved organic contaminants are present in groundwater (ppm to ppb), and to the constraints this presents for conventional mass spectrometry, most stable isotope work to date has relied on isotopic analysis of CO2 to examine hydrocarbon degradation.   Gas Chromatograph/Combustion/Isotope Ratio Mass Spectrometry (GC/C/IRMS), or compound specific isotope analysis (CSIA) of organic compounds provides a more efficient means of constraining subsurface processes by which examining changes in the isotropic compositions of the individual contaminants directly.  This lecture will provide an overview of laboratory and field research designed to answer a number of key questions related to the surface distribution of and behavior of organic contaminants.  Under what circumstances are 813C isotopic signatures conservative (and indicative of source/origin) versus non-conservative (indicative of process)?  Can isotopes be used to differentiate and quantify sources at sites where a number of discrete spills may contribute to the contamination?  To what extent is isotopic fractionation associated with the relevant surface processes that control contaminant fate and attenuation i.e. volatilization; adsorption; biodegradation; abiotically-mediated degradation?  Can isotopes be used to monitor the effectiveness of natural attenuation schemes such as intrinsic bioremediation by microbial communities?

Biographical Information

Dr. Barbra Sherwood Lollar is an Associate Professor in the Dept. of Geology, University of Toronto, and Director of the Stable Isotope Laboratory in that department since 1991.  She is a graduate of Harvard University and holds a Ph.D. in isotopic geochemistry from the University of Waterloo.  Dr. Sherwood Lollar’s specialization is the application of stable isotope geochemistry to gaseous and aqueous systems.  Current work focuses on investigation of the origin, transport and transformation of carbon-bearing compounds and contaminants (including light hydrocarbons and organic solvents) in groundwater.

Clarence S. Tears, Jr.Director, Big Cypress BasinSouth Florida Water Management DistrictDilemma of Water Resources Planning In A Rapidly Urbanizing Area (Collier County)  Friday, February 27, 1998 3:00 p.m., Reitz Union Room 282


This presentation will focus on upgrading and transforming a surface water management system that evolved from historical agricultural works and drainage systems constructed in the early 60's and 70's into a twenty-first century urban system.  The importance of considering water quality, water supply, flood control, and environmental enhancement opportunities when dealing with water resource issues to ensure sustainable natural systems will be discussed.  Additional topics include the hydrologic and hydraulic modeling of an entire basin, the Lake Trafford restoration, and the Southern Golden Gate Estates land acquisition.

Dr. Jon MartinDepartment of Geology, UF  Why are the Seas Salty? FLORIDA CHAPTER OF SIGMA XI  Wednesday, February 18, 1998 11:45 a.m. (Luncheon Lecture), Reitz Union Room 400

Prof. Philip BennettDepartment of Geological SciencesUniversity of Texas at Austin  Darcy Lecture Sponsored by the Association of Ground WaterScientists and Engineers   Friday, November 12, 1997 1:30 p.m., New Engineering Building Room 102

   Prof. Cesar N. CaviedesChairman, Department of GeologyUniversity of Florida El Nino: Anatomy of a Tropical Disturbance of Global Implications  Wednesday, October 15, 1997 3:00 p.m., Reitz Union Room 287