Transcript [Presentation Title] - Southeast Florida Utility Council

City of Sunrise
Floridan Aquifer Test Program
Searching for Sustainable Water Quality and Yield
Imagine the result
Today’s
Presenter
David Smith, ARCADIS
Credits
Rod Miller, Marc Killingstad,
ARCADIS
Plantation, Florida
[email protected]
954-422-2514
Susan Bodmann, Neil Johnson,
MWH
Bob Romeo, Guarionex De Los
Santos, Tim Welch, City of Sunrise
Dan Ringdahl, Florida Design
Drilling
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Outline
The Challenge
Evaluation
• Site Selection
• DIW Evaluation
• Groundwater Modeling
• Test Wells SGF-1 and SGF-2
Sustainability
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The
Challenge
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• Permitting (SFWMD Permit
The
Challenge… mandate)
• Well Construction (locations)
• Hydrogeologic
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Well
Construction Location Issues
• Land ownership / easements
• Construction zone
• Wellhead appurtenances, raw
water piping
• Disposal of test waters
• Hydrogeological factors
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Its not just a “hole in the ground”
• Artesian head, approximately 40 feet above ground level
• Potential migration of brackish groundwater into overlying
fresh water Surficial Aquifer during construction if:
• Inadequate intermediate casing strings
• Uncontrolled surface releases
• Variable aquifer characteristics
• Permeability
• Water quality
• SDI
• Resource sustainability
• Withdrawal (regional and localized well impacts)
• Salinity increases (up-coning)
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Hydrogeologic
Framework
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Hydrogeologic
Framework
Vertical changes in
salinity reflect
historic “flushing”
of the aquifer….
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Hydrogeologic
Framework
Once below sea, all
of the aquifer was
saline
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Hydrogeologic
Framework
Now “freshened”,
but reversals in
salinity can occur
above the
lowermost USDW…
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Less Brackish
Less Brackish
Evaluation
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Site
Selection
Six Production well
sites selected from
more than 25 sites
evaluated
Two locations
chosen for
test/production
wells
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Locations
SGF-1 Roadway median
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Locations
SGF-2 Storm Retention
Basin
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DIW
Evaluation
(Sunrise
Injection Well
Complex)
• Increased
understanding of
the Floridan aquifer
• Availability of an
existing extensive
monitor zone
network
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Injection
Well
Evaluation
Opportunities for
knowledge from
construction of Class
I injection well
systems
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Groundwater
Modeling
Refinements to
an existing
multi-layer
variable density
model
(SEAWAT)
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Groundwater
Modeling
• A tool to help quantify potential
hydraulic impacts and changes
in water quality
• Model Outputs:
– Water level heads, drawdowns and
vertical flux between model layers
– Predicted water level changes in the
IW monitor zone complex
• Application:
– Optimize well spacing
– Production interval
– Refine APT’s
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Groundwater
Modeling
12 MGD
withdrawal
from the
UFA
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Groundwater
Modeling
Predicted head
changes
• All permitted tricounty
withdrawals
• During planned
APT’s
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Test wells
SGF-1 and
SGF-2
Two test/production
wells:
• Final casings 16-inch ID
FRP, 1,014 feet bls (SGF-2)
• Pilot hole drilling max
depth 1,863 feet bls (SGF-2)
• Extensive testing
• UFA Production interval
selected
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Test wells
SGF-1 and
SGF-2
Testing included:
• Lithologic analysis
• Drill Stem water quality
• Specific capacity testing, incl. shut-in
tests
• Geophysical logging, formation and fluid
• Creative Packer testing (combination of
annulus pumping, drill stem pumping,
straddle packer geometries)
• SDI and sand testing
• Aquifer performance testing (step
drawdown and constant rate with
pumping of each and both production
wells with extensive monitoring)
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Test wells
SGF-1 and
SGF-2
Salinity reversals
more extreme than
expected
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Test wells
SGF-1 and
SGF-2
UFA and APPZ
observed, but other
more permeable flow
intervals identified
between these
zones.
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Test wells
SGF-1 and
SGF-2
Due to the discrete
production interval
with appropriate
WQ, lower
permeability and
storage than
desired.
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Sustainability
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• Aquifer recharge
Sustainability
– Is natural recharge sufficient to
meet the current and projected
withdrawals from this aquifer?
– Is Managed Aquifer Recharge
(MAR) required?
• Well construction
– Interconnection of multiple aquifer
zones – bad practice or not
important?
• Water Quality
– Salinity increases – how much,
when?
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Questions?
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Imagine the result
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