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.

Crooked Creek Water Reclamation Facility Improvement Project CP4

Annual Update #2 Tuesday, May 21, 2019

Facility History

Construction Progress

Project Update • Scope • Schedule • Budget

Agenda

Facility History

Gwinnett County Water Reclamation Facilities

Lake Lanier F. Wayne Hill WRC

Crooked Creek WRF

Yellow River WRF

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

2010

Crooked Creek WRF Current Condition

New Influent Pump Station and Headworks (CP-1) 2012

Crooked Creek WRF Current Condition

New Admin, Maintenance and Warehouse (CP-2) 2014

Crooked Creek WRF Current Condition

Retrofit Tank with Diffused Aeration (CP-3A) 2015

Crooked Creek WRF Current Condition

New Cloth Media Filters, Retrofitting Clarifiers (CP-3B &3C) 2016

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

Crooked Creek WRF CP-4 Original Concept

Convert to Membrane Bioreactor

Add Storage

Projected Construction Cost

$260M

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

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

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

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

Construction

Contract

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

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

Future Chosen Concept Crooked Creek CP4

Future expansion

Future Digesters

Solids

Bioreactor

Filters

Ultraviolet

Disinfection

(UV)

June 2017

Headworks

Effluent

IPS

Clarifiers

Odor Control

August 2017

Odor Control

IPS Solids

Bioreactor

Clarifiers

Filters

Effluent

Headworks

UV

Odor Control IPS Solids

Bioreactor

Clarifiers

Filters

Effluent

Headworks

UV

November 2017

12-31-17

Odor Control IPS

Solids

Bioreactor

Clarifiers

Filters

Effluent

Headworks

UV

December 2017

April 2018

Odor Control

IPS

Solids

Bioreactor

Clarifiers

Filters Effluent

Headworks

UV

Solids

IPS

Odor Control

October 2018

Headworks

Filters UV

Bioreactor

Clarifiers

Effluent

Solids

IPS

Odor Control

April 2019

Headworks

Filters UV

Bioreactor

Clarifiers

Effluent

Demolition of aeration basins and construction of bioreactors

Facility flyover

Time lapse video solids handling

Keeping Plant in Operation

Limited Space

Underground Utilities

SCADA

Project Challenges

Project Challenges Underground Utilities

3-D Modeling

Project Challenges Underground Utilities

Technology Update

Enhance Capabilities

Cyber Security

System Maintenance

SCADA Conversion

Project Update

Schedule

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

Project Update

Scope

• 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

Technology Update

Enhance Capabilities

Cyber Security

System Maintenance

SCADA Conversion

Project Update

Budget

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

Construction Change Order No. 2

SCADA

Magnesium Hydroxide

Other Changes

Total

Time extension

• $555,624 • $400,000 • $135,258 • $1,090,882

• 60 days

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

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

Change Order Summary

• $1,090,882.23 • 60 days Construction

• $4,500,000 • 150 days Consultant

Construction Documentation

Digital Construction Documentation

Photos Videos Webcams

Drone Footage

3-D Scanning

Mobile Interactive Floor Plan

3-D Modeling

Project Success

No lost work

injuries

2018 Plant of the Year

No permit

violations No spills

Questions?