Stewart Smith, M.S. Hydrologist
Mr. Smith joined Hydro Geo Chem in 1989 as a Hydrogeologist. His responsibilities include management of site characterization and remediation activities, numerical assessment of landfill gas generation and design of LFG collection and control systems, design of soil and groundwater remediation systems, collection and interpretation of chemical and hydrogeologic data, use of numerical models for remedial design and as predictive and interpretive tools, and preparation of interpretive reports. Project management duties have included representation of clients to and negotiation with controlling regulatory agencies.
(Geosciences), University of Arizona, Tucson, Arizona, 1980.
M.S. (Hydrology), University of Arizona, Tucson, Arizona, 1989.
Management of a groundwater remediation project at an Albuquerque,
NM landfill site. Project elements include estimation of landfill
gas generation rates, design of a soil vapor extraction (SVE) system
to remove VOC from soils underlying the landfill that act as a continuing
source to groundwater, and design of a groundwater pump and treat
system. Includes field measurement of soil and aquifer properties
to support the design of the SVE and groundwater treatment system,
and evaluation of other remedial alternatives.
Numerical modeling of the decomposition of municipal solid waste under
both aerobic and anaerobic conditions. Model results were used to
support the design of an in-situ pilot aerobic treatment system for
a closed City of Tucson landfill and to predict long term methane
generation rates for untreated landfills.
Numerical modeling of a baro-pneumatic landfill gas generation rate
measurement technique to support a patent application. Patent is pending.
Use of the technique to estimate landfill gas generation rates in
landfills located in Tucson, AZ, Albuquerque, NM, and Livermore, CA.
Design of deep soil vapor extraction (SVE) systems for protection
of groundwater beneath three Tucson, AZ landfills. Systems were configured
to maximize removal of deep vadose zone volatile organic compounds
(VOC) that have acted as a source to groundwater while minimizing
air intrusion into the overlying landfill. The design process included
the use of three-dimensional numerical gas flow and transport models
that utilized estimates of soil properties derived from field air
Management of an SVE design study at a U.S. Environmental Protection
Agency Superfund site located near Gary, Indiana. Work included performance
of a pilot test, design of an SVE remedial system for the site using
numerical models, and preparation of a design report. The effects
of biodegradation resulting from SVE operation were included in the
evaluation. The system is currently operating within design parameters.
Analysis of multi-depth soil gas data collected at a municipal landfill
in Tucson, Arizona. Work included supervision of field activities
and development of numerical flow and transport models that incorporate
groundwater and soil gas data as an aid to understanding past history
and current and potential future impacts of VOCs on groundwater.
National Groundwater Association
Phi Kappa Phi (Honorary Society).
General Physics Corporation Short Course, "Bioremediation Engineering"
and Waste Management Association Seminar, "Bioventing and Vapor
Extraction: Uses and Application in Remediation Operations",
40-Hr Health and Safety Training for Hazardous Waste Site Activities,
September 1989. 8-Hr Refreshers, Annually.
Bentley, H.W. and S.J. Smith. 1998. Soil Vapor Extraction of Chlorinated
VOCs in the Vicinity of a Landfill Equipped with a Landfill Gas Control
System. Presentation at the 1998 Arizona Hydrological Society Eleventh
Annual Symposium. September 23 to 26, 1998. Abstract with Proceedings.
Bentley, H.W., J. Tang, S.J. Smith, D. Samorano, R.G. Arnold. 1998.
Analysis of Remedial Options for Chlorinated VOCs at Harrison Landfill.
In: Bioremediation and Phytoremediation, Chlorinated and Recalcitrant
Compounds. The First International Conference on Remediation of Chlorinated
and Recalcitrant Compounds. Monterey, California, May 18 to 21, 1998.
Ward, J.J. and S.J. Smith. 1998. Arid Zone Landfills: What Do Investigation
and Modeling of Containment Migration Reveal About Transport Mechanisms?
Presentation at the 1998 Arizona Hydrological Society Eleventh Annual
Symposium. September 23 to 26, 1998. Abstract with Proceedings.
Smith, S.J., J. Pepe, and G.R. Walter. 1995. The Effect of Variable
Injection Rates on Air Sparging Patterns in Heterogeneous, Porous
Media. Presented at the First International Symposium on In-Situ Air
Sparging for Site Remediation. Las Vegas, Nevada.
S. and G. Walter. 1993. Numerical Modeling of "Raining"
Soil Vapor Extraction Wells for a Hypothetical Alluvial Aquifer. Presented
at Rocky Mountain Ground Water Conference - Ground Water Technology
and Tasks in the 90's, Albuquerque, New Mexico, 1993.
Walter, G.R., R.D. Philip, and S.J. Smith. 1993. Chicken/Egg Arguments
in the Establishment of Soil Cleanup Standards. Presented at Hazmacon
'93, San Jose, California.
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