Crooked Creek Water Reclamation Facility Improvement Project Construction Package 4 (CP-4) Annual Update #1. Tuesday, May 29, 2018

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Melvyn Pitts
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1 Crooked Creek Water Reclamation Facility Improvement Project Construction Package 4 (CP-4) Annual Update #1 Tuesday, May 29, 2018

3 Agenda Facility History Construction Progress Project Update Schedule Scope Budget Next Steps

4 Facility History

5 Gwinnett County Water Reclamation Facilities F. Wayne Hill WRC Buford Crooked Creek WRF Yellow River WRF Lilburn

6 Crooked Creek Water Reclamation Facility 16 MGD, Conventional Treatment Technology 30 acres useable land Summary of History Purchased in 1972 Expanded to 2 MGD in 1977 Expanded to 6.5 MGD in 1987 Expanded to 16 MGD in 1990 Construction Projects 1-3

7 Upgrade Considerations Plant Must Remain in Operation Limited Usable Space

8 2010

9 Crooked Creek WRF Current Condition 2012 New Influent Pump Station and Headworks (CP-1)

10 Crooked Creek WRF Current Condition 2014 New Admin, Maintenance and Warehouse (CP-2)

11 Crooked Creek WRF Current Condition 2015 Retrofit Tank with Diffused Aeration (CP-3A)

12 Crooked Creek WRF Current Condition 2016 New Cloth Media Filters, Retrofitting Clarifiers (CP-3B &3C)

Maintenance Facility CP3 Aeration Basin,

13 Previous Facility Improvements CP1 Influent Pump Station and Headworks CP2 Operations Center and Maintenance Facility CP3 Aeration Basin, Clarifiers, Filters and Plant Drive Total $22.0M $11.6M $13.2M $46.8M

14 Construction Package 4 Goal: To bring Crooked Creek up to the Gwinnett Standard Safety Update electrical system Compliant with best practices in safety Efficiency Reliability Chemical and power usage Better flexibility to adjust to changing conditions Electrical, UV, and SCADA systems Aeration basins, solids handling and old equipment

15 Construction Progress

16 Headworks Odor Control IPS Solids Filters Bioreactor Clarifiers UV Effluent June 2017

17 Odor Control IPS Solids Headworks Filters Bioreactor Clarifiers UV Effluent August 2017

18 Odor Control IPS Solids Headworks Filters Bioreactor Clarifiers UV Effluent November 2017

19 Headworks Odor Control IPS Solids Filters Bioreactor Clarifiers UV Effluent December

20 Solids Filters UV Effluent IPS Clarifiers Odor Control Bioreactor Headworks April 2018

21 Current Construction Project by the Numbers 46,000 cubic yards concrete 5,100 concrete trucks One football field 3 stories tall 6,300 tons reinforcement steel Equal to weight of planes

22 Current Construction Project by the Numbers 820,000 cubic yards of earthwork One football field 46 stories tall 2.3 million feet of wiring and cable Atlanta to Orlando

23 Project Challenges Keeping Plant in Operation Limited Space Geological Conditions Underground Utilities

24 Project Challenges Keeping plant operational

25 Project Challenges Limited space

26 Project Challenges Limited space

27 Project Challenges

28 Project Update Schedule

29 Crooked Creek Completion Milestones Electrical Building and Generators UV Biological Reactor Basins Solids Handling Odor Control Milestone 1 SCADA Conversion Milestone 2 Milestone Clarifiers 2

30 Schedule Construction NTP May 1, 2017 Bioreactors Solids Clarifiers Milestone 2 September 18, 2020 Final Completion May 1, 2021 Current Progress Milestone 1 March 16, 2019 Electrical UV SCADA Substantial Completion January 22, 2021

Milestones Milestone 1 Milestone 2 UV Deerings PS Electrical building Generators 2 2 2

31 Milestones Milestone 1 Milestone 2 UV Deerings PS Electrical building Generators Bioreactors Solids Handling Odor Control Secondary Clarifiers SCADA Conversion Demolition

32 Future Chosen Concept Crooked Creek CP4 Future Digesters Future expansion

33 Project Update Scope

34 SCADA Conversion (facility management software) Technology Update Enhance Capabilities Cyber Security System Maintenance

35 Scope Belt Filter Press

36 Scope Belt Filter Press

37 Project Update Budget

38 Budget Engineer s Estimate $134,958,000 Construction Bids Alberici $131,865,200 PC Construction $145,619,000 Expenditures to Date $27,803,362

39 Estimated vs. Actual Spend Millions $35 $30 $25 $20 $15 $10 $5 $- Estimated Spend by April 2018 $28,919,643 Actual Spend by April 2018 $27,803,362 Difference $1,116,281 Estimated Spend Actual Spend