1. July 1, 2019
City of Sunrise Floridan Aquifer Test Program Searching for Sustainable Water Quality and Yield
Imagine the result

2. Today’s Presenter Credits David Smith, ARCADIS
Plantation, Florida
Today’s Presenter
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

3. Outline The Challenge Evaluation Sustainability Site Selection
DIW Evaluation
Groundwater Modeling
Test Wells SGF-1 and SGF-2
Sustainability

4. The Challenge

5. The Challenge… Permitting (SFWMD Permit mandate)
Well Construction (locations)
Hydrogeologic

6. Well Construction Location Issues Land ownership / easements
Construction zone
Wellhead appurtenances, raw water piping
Disposal of test waters
Hydrogeological factors

7. 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)  

8. Hydrogeologic Framework

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

10. Hydrogeologic Framework
Once below sea, all of the aquifer was saline

11. Hydrogeologic Framework
Less Brackish
Now “freshened”, but reversals in salinity can occur above the lowermost USDW…
Less Brackish

12. Evaluation

13. Site Selection
SGF-2
Six Production well sites selected from more than 25 sites evaluated Two locations chosen for test/production wells
SGF-1

14. Locations SGF-1 Roadway median

15. Locations SGF-2 Storm Retention Basin

16. DIW Evaluation (Sunrise Injection Well Complex)
Increased understanding of the Floridan aquifer
Availability of an existing extensive monitor zone network

17. Injection Well Evaluation
Opportunities for knowledge from construction of Class I injection well systems

18. Groundwater Modeling
Refinements to an existing multi-layer variable density model (SEAWAT)

19. 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
Groundwater Modeling

20. Groundwater Modeling
12 MGD withdrawal from the UFA

21. Groundwater Modeling Predicted head changes
All permitted tri-county withdrawals
During planned APT’s

22. 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

23. 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)

24. Test wells SGF-1 and SGF-2
Salinity reversals more extreme than expected

25. Test wells SGF-1 and SGF-2
UFA and APPZ observed, but other more permeable flow intervals identified between these zones.

26. Test wells SGF-1 and SGF-2
Due to the discrete production interval with appropriate WQ, lower permeability and storage than desired.

27. Sustainability

28. Sustainability Aquifer recharge Well construction Water Quality
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?
Sustainability

29. Questions?

30. Imagine the result