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Official Informal Briefing Minutes
Tuesday, May 21, 2019 – 10:30 AM Present: Charlotte J. Nash, Jace W. Brooks, Ben Ku, Tommy Hunter, Marlene M. Fosque
1. Water Resources
Crooked Creek Water Reclamation Facility: Construction Update Water Resources’ Deputy Director of Technical Services Rebecca Shelton and Section Manager of Construction Inspection Kris Campbell provided an update on the construction of the Crooked Creek Water Reclamation Facility. No official action taken.
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Crooked Creek Water Reclamation Facility Improvement Project CP4
Annual Update #2 Tuesday, May 21, 2019
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Facility History
Construction Progress
Project Update • Scope • Schedule • Budget
Agenda
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Facility History
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Gwinnett County Water Reclamation Facilities
Lake Lanier F. Wayne Hill WRC
Crooked Creek WRF
Yellow River WRF
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Crooked Creek Water Reclamation Facility
16 MGD, Conventional Treatment Technology
30 acres useable land
Summary of History
• Purchased 1 MGD treatment lagoon 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
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2010
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Crooked Creek WRF Current Condition
New Influent Pump Station and Headworks (CP-1) 2012
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Crooked Creek WRF Current Condition
New Admin, Maintenance and Warehouse (CP-2) 2014
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Crooked Creek WRF Current Condition
Retrofit Tank with Diffused Aeration (CP-3A) 2015
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Crooked Creek WRF Current Condition
New Cloth Media Filters, Retrofitting Clarifiers (CP-3B &3C) 2016
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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
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Crooked Creek WRF CP-4 Original Concept
Convert to Membrane Bioreactor
Add Storage
Projected Construction Cost
$260M
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Crooked Creek WRF CP-4 Original Concept (basis of RP002-14)
Convert #1 and #2 Oxidation Ditches to Diffused Aeration
Rehab 4 small clarifiers
Projected Construction Cost $60-80M
Operates as Two Separate Plants
Odor Issues Remain
No Space for Future Expansion
Engineering contract awarded September
2014 to CH2M for $8.9M
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Crooked Creek WRF Chosen Concept (During Prelim. Design)
Build all new biological and secondary process facilities
New solids handling facility
Replace entire electrical system
Replace entire SCADA system
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Final Design
Single plant operations
New robust odor control
Replaces aging infrastructure at end of useful life
Room for future expansion
Projected
construction cost
was increased to
$135 Million
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Construction Package 4
Goal: To bring Crooked Creek up to the Gwinnett Standard
• Outdated electrical system • Not compliant with best practices in safety Safety • Chemical and power usage • Better flexibility to adjust to changing conditions Efficiency • Electrical, UV, and SCADA systems • Aeration basins, solids handling and old
equipment Reliability
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Construction
Contract
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Crooked Creek Completion Milestones
Electrical Building and Generators
UV Disinfection
SCADA Conversion
Milestone 1
Milestone 2
Biological Reactor Basins
Solids Handling
Odor Control
Clarifiers
Milestone 2
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Milestones
2 2
2 1 1
1
2 2
2
2
2
1 1
Milestone 1
UV
Deerings PS
Electrical building
Generators
SCADA Conversion
Milestone 2
Bioreactors
Solids Handling
Odor Control
Secondary Clarifiers
Demolition
1
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Future Chosen Concept Crooked Creek CP4
Future expansion
Future Digesters
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Solids
Bioreactor
Filters
Ultraviolet
Disinfection
(UV)
June 2017
Headworks
Effluent
IPS
Clarifiers
Odor Control
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August 2017
Odor Control
IPS Solids
Bioreactor
Clarifiers
Filters
Effluent
Headworks
UV
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Odor Control IPS Solids
Bioreactor
Clarifiers
Filters
Effluent
Headworks
UV
November 2017
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12-31-17
Odor Control IPS
Solids
Bioreactor
Clarifiers
Filters
Effluent
Headworks
UV
December 2017
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April 2018
Odor Control
IPS
Solids
Bioreactor
Clarifiers
Filters Effluent
Headworks
UV
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Solids
IPS
Odor Control
October 2018
Headworks
Filters UV
Bioreactor
Clarifiers
Effluent
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Solids
IPS
Odor Control
April 2019
Headworks
Filters UV
Bioreactor
Clarifiers
Effluent
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Demolition of aeration basins and construction of bioreactors
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Facility flyover
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Time lapse video solids handling
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Keeping Plant in Operation
Limited Space
Underground Utilities
SCADA
Project Challenges
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Project Challenges Underground Utilities
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3-D Modeling
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Project Challenges Underground Utilities
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Technology Update
Enhance Capabilities
Cyber Security
System Maintenance
SCADA Conversion
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Project Update
Schedule
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Initial Schedule
Construction NTP
May 1, 2017
Milestone 1 March 16,
2019
Electrical
UV
SCADA
Bioreactors
Solids
Clarifiers
Milestone 2 September
18, 2020
Substantial Completion
January 22, 2021
Final Completion
May 1, 2021
Current
Progress
July 2021
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Project Update
Scope
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• Adjust pH to enhance biological process
• Prone to clogging • Original design
• Tank and pumps 600 feet from application point
• New design • Tank and pumps
adjacent to application point
Magnesium Hydroxide Relocation
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Technology Update
Enhance Capabilities
Cyber Security
System Maintenance
SCADA Conversion
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Project Update
Budget
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Construction Budget
Engineer’s Estimate • $134,958,000
Construction Bids • Alberici $131,865,200
• PC Construction $145,619,000
Expenditures to Date • $78,631,717
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Construction Change Order No. 2
SCADA
Magnesium Hydroxide
Other Changes
Total
Time extension
• $555,624 • $400,000 • $135,258 • $1,090,882
• 60 days
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Construction Change Order Summary
Original Bid
Change Order 1
Change Order 2
New Contract Total
• $131,865,200.00
• $ 1,780,340.77
• $ 1,090,882.23
• $134,736,363.00
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Construction
$70M
$132M
$135M
Design & Construction Management
$8.9M
$13.1M
$17.6M
• Consultant Change Order • $4.5M • 150 days
• Construction Management • Requests for Information • Submittals • Supplemental Construction
Inspection
Consultant Change Order No. 2
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Change Order Summary
• $1,090,882.23 • 60 days Construction
• $4,500,000 • 150 days Consultant
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Construction Documentation
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Digital Construction Documentation
Photos Videos Webcams
Drone Footage
3-D Scanning
Mobile Interactive Floor Plan
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3-D Modeling
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Project Success
No lost work
injuries
2018 Plant of the Year
No permit
violations No spills
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Questions?