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Groundwater modeling and hydrogeology services
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Shaw’s Environmental & Infrastructure Group
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Vikas Tandon February 3, 2011 Stoughton, MA
Modeling Services & Capabilities
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Qualifications Highlights
Ph.D., Hydrogeology
P.G., Pennsylvania
14 years experience
Leadership Committee, NGWA Groundwater Law Group
Chair, Shaw Fate & Transport Technology Exchange
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Expertise Overview
Hydrogeologic Investigations and Data Interpretation
Modeling
Aquifer Hydraulics, Well Field Design
Groundwater / Surface Water Interaction
Dewatering Design
Remedial System Optimization
Litigation Support
NPDES Permit Support
Project/Task Management
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Model Applications
Remedial Design
Soil Leaching
Contaminant Fate and
Transport
O&M System Optimization
Plant Discharges to Surface
Water
Groundwater Flow
Analysis
Well Head Protection
Water Supply
Development and
Impact Analysis
Dewatering Design
Infiltration Analysis
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Model Codes
MODFLOW, WINFLOW, … groundwater flow
MODPATH particle tracking and capture zone
delineation
CORMIX modeling discharge to rivers, lakes and
ocean
MT3D, RT3D, WINTRANS.. contaminant transport
SEAWAT density-driven flow and transport
PEST automatic model calibration
BIOSCREEN, BIOCHLOR screening level fate
and transport of petroleum hydrocarbon and
chlorinated solvents
HELP, VLEACH, SESOIL contaminant migration
through unsaturated soil zone
MAROS monitored natural attenuation
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Fate & Transport Modeling
Monitored Natural
Attenuation
Groundwater Extraction
In-Situ Chemical
Treatment
Physical Containment
Chemical Containment
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Groundwater Pump and Treat
Maywood FUSRAP Site, NJ
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St. Mary’s Refining Company, WV
MNA , Benzene Plume
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St. Mary’s – 5 Year Benzene Plume
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St. Mary’s – 10 years Benzene Plume
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St. Mary’s – 30 years Benzene Plume
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Remedial System Optimization
Re-evaluate remedial
system operations
Objectives:
– Optimize performance
– Reach remediation
goals
– Avoid endless O&M
– Lower O&M costs
– Cost-effective closure
– Simplify operations
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MCAS Cherry Point – Existing System
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MCAS Cherry Point – Optimized System
Flow
Rate
GPM
51EX10 15.00 3%
51EX11 11.00 -25%
51EX12 7.00 -9%
51EX13 7.00 3%
51EX14 4.00 -53%
51EX15 4.00 -52%
51EX16 6.50 3%
51EX17 10.00 3%
51EX18 11.00 -24%
51EX19 6.00 -19%
Bld 137
system0.60 0%
Well ID
% change
from 2002
rate
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MCAS Cherry Point – Scenario 2
Flow
Rate
GPM
51EX10 15.00 3%
51EX11 11.00 -25%
51EX12 7.00 -9%
51EX13 7.00 3%
51EX14 4.00 -53%
51EX15 4.00 -52%
51EX16 6.50 3%
51EX17 10.00 3%
51EX18 0.00 -100%
51EX19 0.00 -100%
Bld 137
system0.60 0%
Well ID
% change
from 2002
rate
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Dewatering Design
Often required for
mining and construction
Improper water
management practices
may lead to:– Flooding
– Unsafe work conditions
– Reduction or loss of water
supply for other users in
community
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Case Study: Roaring Spring, PA
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Water Resource Litigation
Roaring Spring – 10 million gallons/day flow Water source for industrial and domestic users
Limestone/Dolostone Quarry Expansion Mine permit requires prediction of impacts on water supply
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Conflict Resolution:
Technical Tools and Approach
Scientific evaluation of effects of
dewatering on regional water
supplies
Prediction of short-term and long-
term impacts
Numerical models efficiently
integrate local complexities
Geo-science tools used
pumping tests
aerial photographs
fracture trace analysis
groundwater flow path delineation
surface water measurements
water budget calculations
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Quarry Dewatering – Model Prediction
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MODEL UNCERTAINTY
All model predictions are uncertain to some extent
Higher uncertainty = lower confidence
Uncertainty quantified by calibration error
Location of uncertainty as important as the magnitude
Causes of uncertainty
Lack of site-specific data
Parameter selection ambiguity
Flow system conceptualization
inaccuracies
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VOGTLE Nuclear Island Dewatering
Large volume, multi-year duration
Excavate to 95 feet below grade, about 35 feet
below water table
3-dimensional MODFLOW /MODPATH model
Estimated impact on community water supply
Technologies modeled
Extraction wells
Trenches
Horizontal Drains
Slurry wall
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Modeling Cooling Water / Wastewater
Discharge to Surface Water
RRI Energy, Conemaugh
Power Plant, PA (2008)
VC Summer Nuclear
Power Plant, SC (2010)
NRG Dunkirk Generating
Station, NY (2009)
FMC Corporation Tonawanda
Plant, NY (2008)
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Modeling Cooling Water / Wastewater
Discharge to Surface Water
RRI Energy, Keystone Power
Plant, Shelocta, PA (2007)
Von Roll America, East Liverpool, OH (2005)
El Palito Refinery, Petróleos de
Venezuela, S.A., Venezuela (2006)
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Selenium Mixing in Lake Erie
NRG Dunkirk Power Station, NY
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VC Summer Nuclear Station
Diffuser Modeling
Cooling water blowdown and
waste water discharge to mix with
waters of the Parr Reservoir
located on the Broad River
Multi-port diffuser design by
Shaw.
Mixing of the discharge
simulated using the computer
model CORMIX
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PARR RESERVOIR
TAILRACE DISCHARGE
MONTICELLORESERVOIR
PROPOSED DISCHARGE LOCATION
PARR SHOALS DAM
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VC Summer – Par Shoals Dam
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VC Summer Nuclear Station
Diffuser Modeling
Model simulations were performed to determine :
Mixing zone dimensions as per SCDHEC
requirements
Maximum river water temperature increase
of 5°F
Max. river water temperature of 90°F
Mixing zone boundary of 1/2 the width of
the river and a downstream length of 2 x the
river width
Effluent dilution factors
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Guterl Steel FUSRAP, Lockport, NY
Issue: Uranium contaminated soil and groundwater
Project Tasks
Data Gap
Assessment
Soil Leachate
Modeling
Groundwater
Modeling
Feasibility Study
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FP&L Proposal – Radial Collector Well
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Modeling Costs versus Benefits
Costs reflect project
complexity and goals
Modeling
aids project planning
provides basis for
decision making
based on integrated
assessment of data
saves on long term
costs
Pump & Treat System Optimization
Marine Corps Air Station, Cherry Point, NC
Net system capacity reduction of 17% was
recommended, resulting in estimated cost
savings of $450,000 per year
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Conclusions
Modeling can help projects navigate through an array of issues
related to environmental impact delineation, remedial design
and permitting
Modeling is a powerful tool for evaluating complex problems
Models are useful when multiple factors affecting the results are
interconnected and change with time and/or space
Shaw E & I has capabilities and experience to support soil,
groundwater and surface water modeling needs
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Key Collaborators
Gary Gaillot, P.G., C.G.W.P. Developing and Implementing
Hydrogeological Investigations
Developing and Implementing Surface
Investigations
Developing and Implementing Surface
Water / Groundwater Interaction
Investigations
Surface and Groundwater Modeling
Designing and Installing Groundwater
Extraction Well Fields, Horizontal
Wells
Groundwater Remediation
Sue Tituskin, P.G. RI/FS/CERCLA Five Year Reviews
RCRA Corrective Action
Remedial Scenario Evaluation
Remedial System Optimization
Remedial System Performance
Evaluation
Jonathan Myers, Ph.D. Geochemistry & Geochemical Modeling
Transport Parameter Development
Environmental Forensics
Environmental Statistics
Natural Attenuation Investigations
Metals Background Investigations
Ke Liu, Ph.D. GIS
3-D Visualization
Geo-statistics
Soil Leachate, Vapor Intrusion Modeling
Database Development
