Imagine the result

City of Sunrise Floridan Aquifer Test Program Searching for Sustainable Water Quality and Yield

Imagine the result

© 2012 ARCADISApril 19, 20232

Today’s Presenter

David Smith, ARCADISPlantation, FloridaDavid.Smith2@arcadis-us.com954-422-2514

Credits Rod Miller, Marc Killingstad, ARCADIS

Susan Bodmann, Neil Johnson, MWH

Bob Romeo, Guarionex De Los Santos, Tim Welch, City of Sunrise

Dan Ringdahl, Florida Design Drilling

© 2012 ARCADISApril 19, 20233

OutlineThe 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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The Challenge…

• Permitting (SFWMD Permit 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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Vertical changes in salinity reflect historic “flushing” of the aquifer….

Hydrogeologic Framework

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Once below sea, all of the aquifer was saline

Hydrogeologic Framework

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Now “freshened”, but reversals in salinity can occur above the lowermost USDW…

Less Brackish

Less Brackish

Hydrogeologic Framework

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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

SGF-2

SGF-1

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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 EvaluationOpportunities 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 tri-

county withdrawals

• During planned APT’s

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Test wells SGF-1 and

SGF-2Two 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)

© 2012 ARCADISApril 19, 202324

Test wells SGF-1 and

SGF-2Salinity reversals more extreme than expected

© 2012 ARCADISApril 19, 202325

Test wells SGF-1 and

SGF-2UFA and APPZ observed, but other more permeable flow intervals identified between these zones.

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Test wells SGF-1 and

SGF-2Due to the discrete production interval with appropriate WQ, lower permeability and storage than desired.

© 2012 ARCADISApril 19, 202327

Sustainability

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Sustainability• Aquifer recharge

– 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?

© 2012 ARCADISApril 19, 202330

Imagine the result