Big Creek WRF Expansion: Public Meeting for Design Progress and Feedback

1. This is the second of several public meetings that will be held during the planning and design of the Big Creek Water Reclamation Facility (WRF) Expansion project. As we continue the design for this project, we wanted to provide this opportunity to inform the public of the design progress and to continue to solicit feedback from the community as to what will be important to you for this project. We are committed to listening to concerns that the surrounding community may have with the project so we can work to address any concerns as part of the design process. There are a series of information stations around the room that you can visit providing information on some of the key concerns we anticipate you and others may have. Please feel free to speak to us about your concerns and provide them in writing to us if you choose. The website BIGCREEKEXPANSION.COMhas also been established as another way for you to provide input to us on the project. • Welcome

2. Project Details • Big Creek WRF first constructed in 1971 • Several expansions since 1971 – current capacity of 24 million gallons per day (mgd) • Serves Roswell, Alpharetta, portions of Milton and Johns Creek, and areas of Cobb and Forsyth Counties • Metropolitan North Georgia Water Planning District forecast - continued population growth and economic development require additional capacity • Expanded plant to ultimately handle 38 mgd using state of the art membrane technology and new odor control systems • Replacement of aging equipment and demolition of older and unused facilities • Project Summary Project Goal Protecting the environment while improving the quality of treated water discharged into the Chattahoochee River and meeting the capacity treatment demands of areas served Project Benefits Increase capacity to meet communities’ needs Provide state-of-the-art advanced treatment for reliable compliance with both current and projected future regulations/limits Eliminate odor and improve facility aesthetics Restore reliability and safety for aging facility

3. 30% Design has been completed and the new facility is expected to be fully operational in late 2023. Additional public meetings will be held at around 80% design to provide further updates and seek public feedback, and at the start of construction. Once construction is underway, regular progress updates will be provided via the project website and social media (visit the Community Engagement/Information Updates station for more on this). • Schedule and Additional Public Input

4. Overall Treatment Process

5. A membrane bioreactor (MBR) system is an advanced technology used for treating wastewater • The system combines biological treatment/nutrient removal with microfiltration membranes that filter out particles greater than 0.2 um (one thousandth of a millimeter) in diameter. Flat Plate membrane technology provided by KUBOTA was competitively selected for the Big Creek WRF Facility • MBR technology is one of the most advanced treatment technologies in wastewater treatment and has successfully been implemented by Fulton County for over a decade at the Johns Creek Environmental Campus and numerous other facilities around the US and the world • MBR Technology KUBOTA Flat Plate Membranes

6. Significantly greater capacity with significantly reduced load/impact to the Chattahoochee River compared to current permitted levels • Water Quality Improvements The high water quality helps protect the environment Permitted Levels at 38 mgd Current Permit Levels at 24 mgd

7. Existing Site Layout Admin Bldg & Lab Headworks Dewatering Bldg Filters UV & Post Aeration BNR Tanks Secondary Clarifiers Digesters

8. New Facility Layout Fine Screens Primary Clarifiers Odor Control BNR Tanks Digesters Lab MBR Tanks Headworks UV & Post Aeration Equalization Tanks Dewatering Bldg Electrical Bldg Chemical Bldg Admin Bldg

9. New Facility Layout

10. New Facility Layout Digesters Odor Control Primary Clarifiers Fine Screens Headworks BNR Tanks Lab Chemical Bldg Equalization Tanks MBR Tanks Dewatering Bldg UV & Post Aeration Admin Bldg Electrical Bldg

11. New Facility Layout

12. Landscaping Buffers A EXISTING WOODLAND TO REMAIN EXISTING EVERGREEN SCREEN HEDGE PRIMARY SCREENING AREA B PROPOSED BUILDINGS EXISTING ROAD TO BE REMOVED A B AMERICAN HOLLY CAROLINA #2 BRODIE EASTERN RED CEDAR LOBLOLLY PINE (CANOPY SCREENING)

13. Architecture The new Big Creek WRF improvements will be designed in coordination with existing facilities • Buildings will be brick / concrete construction • Some of the new structures will have a pitched roof • Majority of the facilities will be closed / not visible to the public • Admin Building will have public gathering space

14. Design Update • Submitted and received acknowledgement for the Design Development Report from Georgia EPD • Have progressed the design to 30% • Have gone through the procurement process and selected the membrane system supplier (Kubota) • Have selected site configuration for new facilities • Conducted subsurface geotechnical evaluations • Developed odor treatment modeling to size odor control equipment

15. During Construction, careful attention will be paid to minimizing impacts to the surrounding community • All construction traffic to the site will use Highway 120 and not Willeo Road. Traffic will not use surrounding neighborhoods to turn around. • Evaluating options to re-use existing material onsite as backfill material to minimize hauling traffic in and out of the site. • Dust and erosion control measures will be employed to protect surrounding streams and reduce impacts to surrounding communities. • Optimized construction schedule reducing overall project duration. • Management of work hours during construction to meet requirements of the City of Roswell. • 24-hr hotline will be provided for reporting of any issues. • Minimizing Neighborhood Impacts During Construction

16. The new Big Creek WRF will have the following odor control provisions: • Treatment basins will be covered. • Fans connected to the odor control equipment will draw air from under the basin covers so that all air in the basins will be treated by the odor control equipment. • Minimizing Neighborhood Impacts - Odor Control Chemical Scrubber (example installation) • Multi-stage chemical scrubbers followed by Granular Activated Carbon (GAC) for highest odor areas, and GAC for the remainder of potential odorous areas. • Sensors will monitor the air leaving the GAC units to make sure they are working properly. GAC (example installation)

17. The new Big Creek WRF will address noise and light concerns with the following provisions wherever practical: • Locating noise and light sources away from neighbors • Centralizing regular traffic on the site • Using noise reduction enclosures for equipment • Using directional, full cutoff area lighting to limit light emissions offsite • Using lighting controls to limit the use of lighting when not needed • Minimizing Neighborhood Impacts – Noise and Light Example Noise Reduction Enclosures VERY BAD Minimizing Light Impacts

18. Design Phase • Project updates and information • Frequently asked questions • Plant information • Project related news • Public meetings Construction Phase • Project updates, news, and information • Frequently asked questions • Plant information • Construction progress photos and videos • Community Engagement/Information Updates Project Website bigcreekexpansion.com The website and social media will be used to keep anyone interested up to date on the project More Information: Kelly Comstock (Kcomstock@brwncald.com 770-673-3669)

19. BIG CREEK WRF EXPANSION PUBLIC MEETING

20. BIG CREEK WRF EXPANSION PUBLIC MEETING

21. BIG CREEK WRF EXPANSION PUBLIC MEETING