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

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, [email protected]

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


OutlineThe Challenge

Evaluation • Site Selection• DIW Evaluation• Groundwater Modeling• Test Wells SGF-1 and SGF-2

Sustainability


The Challenge


The Challenge…

• Permitting (SFWMD Permit mandate)

• Well Construction (locations)• Hydrogeologic


Well Construction Location Issues

• Land ownership / easements• Construction zone• Wellhead appurtenances, raw

water piping• Disposal of test waters• Hydrogeological factors


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)


Hydrogeologic Framework


Vertical changes in salinity reflect historic “flushing” of the aquifer….



Once below sea, all of the aquifer was saline



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

Less Brackish

Less Brackish



Evaluation


Site Selection

Six Production well sites selected from more than 25 sites evaluated

Two locations chosen for test/production wells

SGF-2

SGF-1


Locations SGF-1 Roadway median


Locations SGF-2 Storm Retention Basin


DIW Evaluation (Sunrise Injection Well Complex)

• Increased understanding of the Floridan aquifer

• Availability of an existing extensive monitor zone network


Injection Well EvaluationOpportunities for knowledge from construction of Class I injection well systems


Groundwater Modeling

Refinements to an existing multi-layer variable density model (SEAWAT)



• 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



12 MGD withdrawal from the UFA



Predicted head changes • All permitted tri-

county withdrawals

• During planned APT’s


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



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)



SGF-2Salinity reversals more extreme than expected



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



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


Sustainability


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?


Questions?


Imagine the result

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

Documents

locations sgf

testproduction wells

water level heads

vertical changes

water qualitymodel outputs

sustainable water quality

saline hydrogeologic

groundwater modelinga