Rex A

Rex A. Hodges

Education

Clemson University

Phd. Candidate in Environmental Engineering and Sciences

(Thesis Topic: Steam Flood Modeling: Laboratory to Field Scale Using Air Injection to Control Steam Front Propagation)

(List of Classes taken: Subsurface Remediation Modeling, Groundwater Modeling, Advanced Multiphase Flow Modeling, Groundwater and Contaminant Transport, Analytical Methods in Hydrogeology, Environmental Engineering Principles, Environmental Engineering Chemistry, Environment Microbiology, Environmental Risk Assessment, Aquifer Systems, Hydrogeology of Fractured Aquifers)

M.S., University of North Carolina-Chapel Hill, 1983, Geology

(Thesis Topic: A Petrologic Study of the Lithium Corporation of America Mine, Bessemer City, NC)

B.S., University of Alabama-Birmingham, 1978 Earth Science

Professional Experience

Integrated Hydro Systems, LLC, 2003, Senior Hydrogeologist

Numerical Modeling: Used MODFLOW and RT3D to model the fate and transport of chlorinated solvents (tetrachloroethene and carbon tetrachloride chains) in the Central Industrial Area, PU&D Yard, and Original Landfill Area at the Rocky Flats Environmental Technology Site, Colorado. Used Micosoft Access and Excel to process and evaluate sample data from wells and streams for incorporation into GIS and GMS (MODFLOW and RT3D pre- and post-processor). Wrote programs in visual basic and fortran to process model output for GIS visualization. Used T2VOC to model the affect of vapor loss along the travel path of a plume.

Selected Reports from Rocky Flats Environmental Technology Site, Golden, Colorado:

Fate and Transport Modeling Of Volatile Organic Compounds at Rocky Flats Environmental Technology SiteGolden, Colorado

Assessment of Volatile Organic Compounds in Surface Water at Rocky Flats Environmental Technology SiteGolden, Colorado

Fate and Transport of VOCs in Groundwater In the Vicinity of the Property, Utilization, and Disposal (PU&D) Yard Areas

Clemson University, Department of Geological Sciences, 1993 - 2003, Research Associate

Flow and transport modeling for groundwater supply, contaminant transport, and tracer movement. Multi-phase flow modeling to simulate, plan, and compare various remediation alternatives and their relative effectiveness. Projects include modeling of the emplacement and subsequent migration of contamination, the use of steam floods (current dissertation topic) to remediate contaminated sites, the use of soil vapor extraction and air sparging to remediate contaminated sites, and the long-term impact of contaminant source zones on nearby surface water.

Conducted aquifer performance tests and supervised graduate students on the planning, execution, and analysis of more than fifty well tests to determine aquifer properties throughout the Coastal Plain of South Carolina and Georgia and in the Piedmont of upstate South Carolina. Projects ranged from the evaluation of the Brunswick Aquifer in south-central Georgia as an alternative water supply to evaluation of Tertiary and Cretaceous sediments for water supply and contaminant migration in the vicinity of the Savannah River Site.

Geologic mapping of the Coastal Plain section (stratigraphic and hydrostratigraphic) in the vicinity of the Savannah River Site.

Assisted with field experiments in Utah and Delaware to evaluate innovative remediation methods (co-solvent flooding on LNAPL and DNAPL) of contaminated sites.

Performed tracer tests in Denmark to determine pesticide travel times in the subsurface.

Chevron Exploration and Production Services, New Orleans, Louisiana, 1991-1992

Chevron USA, Inc., New Orleans and Lafayette, Louisiana, 1983 - 1991

Law Engineering Testing Company, Marietta, Georgia and Miami, Florida, 1979-1980

Publications

Hodges, Rex A., R. Falta, and L. Stewart , December, 2004, Controlling Steam Flood Migration Using Air Injection Wells, in Environmental Geosciences, vol. 11, no. 4, pp. 221-238.

Ochs, S.O., R.A. Hodges, and R.W. Falta, Predicted Heating Patterns During Steam Flooding of Coastal Plain Sediments at the Savannah River Site, accepted for publication in Environmental and Engineering Geoscience, 2001.

Hodges, Rex A. and Falta, Ron W. , July 16, 2001, Numerical Modeling of Free-Phase TCE/PCE Emplacement and Transport in the M-Area Basin and Evaluation of Thermal Remediation Technologies: SCUREF Task Order West 041, Final Report.

Hodges, Rex A. and Falta, Ron W. , June 30, 2001, Three-Dimensional Numerical Modeling of Multi-phase Flow and Transport Processes for Evaluation of Soil Vapor Extraction Unit 782-004M (M Area Settling Basin): SCUREF Task Order West 041, Final Report.

Hodges, Rex A., 1998, Aquifer Performance Test Report, Miocene Aquifer, Evans County, Georgia, December 9-31, 1998, for the Department of Natural Resources, Environmental Protection Division, Georgia Geologic Survey.

Hodges, Rex A., 1998, Aquifer Performance Test Report, Brunswick Aquifer, Toombs County, Georgia, July 8-20, 1998, for the Department of Natural Resources, Environmental Protection Division, Georgia Geologic Survey, open file report No. 35.

Hodges, Rex A. and Falta, Ron W. , 1996, Numerical Simulation Of DNAPL Emplacement And Redistribution In Heterogeneous And Porous Media At The M Area Of The Savannah River Site, in Non-aqueous Phase Liquids (NAPLs) in Subsurface Environment: Assessment and Remediation, pp.619-627.

Hodges, R.A. and Benson, S.M., 1995, An Automated Spreadsheet Based Method for Analyzing Step Rate Pump Tests for Partially Penetrating Wells (abs.): Geol. Soc. America, 1995 Annual Meeting, GSA Abstracts with Programs, vol. 27, No. 6, p. A261.

Hodges, R.A., Snipes, D.S., Benson, S.M., et al., 1994, Hydraulic Properties of the Midville Aquifer at the Savannah River Site, South Carolina (abs.): Geol. Soc. America, Southeastern Section, 43rd Annual Meeting, p. 20.

Hodges, R.A., 1988, Vermilion Block 214 Field, Offshore Louisiana Oil and Gas Fields, Volume II: New Orleans Geological Society, pp. 187-192

Hodges, R.A., Feiss, P.G., 1983, A Petrologic Study of the Lithium Corporation of America Mine in the Tin-Spodumene Belt of North Carolina, (abs.): Geological Society of America Abstracts with Programs, V. 15, N. 2, p A67.

Hodges, Rex A., 1994, Aquifer Test Report P Area, SRS July 1-4, 1993, for the U. S. Geological Survey Trans-River Study, in “Hydrologic Properties of Aquifers in the Central Savannah River Area”, Vol 2, 1995, at the Clemson University Cooper Library.

Hodges, Rex A., 1994, Aquifer Test Report B Area, SRS June 24-28, 1993, for the

U. S. Geological Survey Trans-River Study, in “Hydrologic Properties of Aquifers in the Central Savannah River Area”, Vol 2, 1995, at the Clemson University Cooper Library.

Hodges, Rex A., 1994, Aquifer Test Report D Area, SRS December 10-13, 1993, for the U. S. Geological Survey Trans-River Study, in “Hydrologic Properties of Aquifers in the Central Savannah River Area”, Vol 2, 1995, at the Clemson University Cooper Library.

Presentations

Hodges, R.A., 2003, Understanding Groundwater Modeling: A Spreadsheet Approach (abs.): Geol. Soc. America, 2003 Annual Meeting in Seattle.

Hodges, R. A., R. W. Falta., and S. Finsterle, 1997, Simulation of DNAPL Emplacement and Redistribution using Geostatistically Generated Heterogeneous Permeability Distributions, Geol. Soc. America, Southeastern Section, 45th Annual Meeting.

Consulting PROJECTS

Rogers and Calcott, Greenville, SC, 2000. Analysis of pump test data in the Walhalla, SC area.

Camp Dresser and McKee, Charlotte, NC, 1996-1997. Evaluation of groundwater resources in the Florence, SC area.