•
Project coordinator, Voluntary Remediation Program, Phelps Dodge
Christmas Mine. Project coordination, field management, data
interpretation, and reporting for hydrogeological investigation
of mine tailing impoundments. Development of surface water runoff
model and long-term water budget for hydrologic loading to tailing
impoundments.
• Technical consultant for surface water permitting (Phelps
Dodge Christmas Mine, Phelps Dodge Bagdad, Phelps Dodge Miami).
Technical review and comment on draft permits and fact sheets.
•
Technical consultant on total maximum daily load (TMDL) modeling
for Mule Gulch Watershed near Bisbee Arizona. Critical review
of data collection, modeling rational, and interpretation of
simulation results.
•
Engineering consultant for Hexcel Facility, Kent, Washington.
Critical review of potential impacts of permeable reactive barrier
on downgradient groundwater quality, economic evaluation of
clean-up options for remediation of chlorinated solvents, and
Development of soil gas screening levels to evaluate the risk
of groundwater contamination on indoor air quality.
•
Technical consultant for remediation of subsurface jet fuel
contamination at Honeywell International, Phoenix, Arizona.
Interpretation of forensic analysis of aged jet fuel to improve
understanding of the partitioning behavior of a multi-component
contaminant mixture in soil, air, water, and non-aqueous (NAPL)
phases and its relevance for site remediation.
•
Technical consultant in remedial investigation at Sky Harbor
International Airport, Phoenix, Arizona. Facilitated design
and evaluation of experiments to test biological enhancements
to air sparging for removal of jet fuel contamination.
•
Environmental Auditor, Pima County, Arizona Solid Waste Facilities.
Review of operations, records, monitoring, and reporting for
environmental compliance at twelve solid waste facilities.
•
Field Manager of PCE investigation at the Cooper and Commerce
WQARF site, Gilbert, Arizona. Supervision of installation of
remediation wells and collection of soil and soil gas samples
for PCE analyses.
Research
Experience Includes:
•
Co-contaminant effects on risk assessment and remediation activities
involving urban sediments and soils. Numerical modeling to evaluate
the effects of contaminant mixtures on the bioavailability and
remediation potential for contaminated aquifer and sediment-water
systems.
•
Flow and transport in variably saturated environments. Batch,
column, and field studies on preferential solute transport in
variably-saturated soils; numerical modeling of preferential
transport and mass transfer processes; geostatistical analysis
of infiltration rate on agricultural landscapes.
•
Effects of pore-water velocity on rates of radial diffusion
into low-permeability media. Laboratory experimentation and
numerical modeling of the effect of pore-water velocity on the
diffusion rates of a radio-tracer chemical (3[H]-water) in packed
soil column.
•
Military training impacts on watershed and ecosystem hydrology
at Fort Benning, Georgia. Measurement of watershed water storage
dynamics, including infiltration, soil-water retention, and
erosion in impacted and unimpacted catchments.
•
Water budget mapping of Jordan River, Utah. GIS mapping and
quantitative analysis of river inflows and outflows.
PROFESSIONAL
PUBLICATIONS:
Haws, N.W., M.R., Paraskewich Jr., M. Hilpert, W.P.
Ball. 2007. Effect of fluid velocity on model estimated rates
of radial solute diffusion in a cylindrical macropore column,
Water Resource. Res., 43, W10409, doi: 10.1029/2006WR005751.
Haws,
N.W., W.P. Ball, and E.J. Bouwer. 2007. Effects of Initial Solute
Distribution on Contaminant Availability, Desorption Modeling,
and Subsurface Remediation. J. Environ. Qual. 2007 36: 1392-1402.
Perkins,
D.B., N.W. Haws, J.W. Jawitz, B.S. Das, P.S.C. Rao. 2007. Soil
Hydraulic Properties as Ecological Indicators in Forested Watersheds
Partially Impacted by Mechanized Military Training. Ecological
Indicators, 7: 589-597.
Haws,
N.W., E.J. Bouwer, W.P. Ball. 2006. The Influence of System
Conditions and Modeling Formulation when Simulating Cometabolic
Biodegradation in Sorbent-Water Systems. Advances in Water Resources
29(4): 571-589.
Haws,
N.W., W.P. Ball, E.J. Bouwer. 2006. Modeling and Interpreting
Bioavailability of Organic Contaminant Mixtures in Subsurface
Environments. Journal of Contaminant Hydrology 82(3-4): 255-292.
Schmidt,
J.S., N.W. Haws, R.S. Govindaraju, P.S.C. Rao. 2006. A Semi-Analytical
Model for Transient Flow to a Subsurface Tile Drain. Journal
of Hydrology 317(1-2): 49-62.
Das,
B.S., N.W. Haws, P.S.C. Rao. 2005. Defining Geometric Similarity
in Soils. Vadose Zone Journal 4:264 270.
Haws,
N.W., J. Simunek, P.S.C. Rao, I.C. Poyer. 2005. Single Porosity
and Dual Porosity Modeling of Flow and Transport in Subsurface
Drained Fields Using Effective Field Scale Parameters. Journal
of Hydrology 313 (3 4) 257 273.
Haws,
N.W., B.S. Das, P.S.C. Rao. 2004. Dual Domain Solute Transfer
and Transport Processes: Evaluation in Batch and Column Experiments.
Journal of Contaminant Hydrology, 75 (3 4): 257 280.
Haws,
N.W., B. Liu, E.J. Kladivko, P.S.C. Rao, C.W. Boast, D.P. Franzmeier.
2004. Spatial Variability and Measurement Scale of Infiltration
Rate on an Agricultural Landscape. Soil Science Society of America
Journal, 68: 1818 1826.
Haws,
N.W., P.S.C. Rao. 2004. The Effect of Vertically Decreasing
Macropore Fractions on Simulations of Non Equilibrium Solute
Transport. Vadose Zone Journal, 31: 1300 1308.
INVITED
TALKS AND PRESENTATIONS:
Expertise