South Fork improvements program – a mid-program report

1. South Fork improvements program – a mid-program report Kent A. Lackey, P.E. – Black & Veatch Project Manager NC AWWA-WEA 95th Annual Conference

2. AGENDA Background Program Overview Program status Early successes

3. Background – Wastewater system Archie Elledge WWTP Muddy Creek WWTP Winston-Salem/Forsyth County Utility Commission • Approximately 122,000 customers (3rd largest in NC) • 2 WWTPS • Muddy Creek • 21 mgd capacity • Archie Elledge • 30 mgd capacity • Three Drainage Basins • South Fork • Muddy Creek • Elledge • 49 WW Lift Stations • 1,723 miles of sewer

4. Background – long term wastewater treatment analysis • Where is it being generated? • Convey all flows to plants using existing infrastructure • Transfer flows between plants • Transfer flows between basins • System Equalization • Scalping within the collection system • Future New Plant Muddy Creek Basin Elledge Basin South Fork Basin Archie Elledge WWTP Future Plant Option 1 South Fork PS New MC Transfer PS Muddy Creek WWTP Future Plant Option 1 introductions

5. South fork improvements programprogram partners Program Owner : CCUC • Utilities Administration • Wastewater Treatment • Collection & Maintenance • Finance • City Attorney Program Manager: Black & Veatch • Program Management • MCCIPS and Force Main Design • Optimization Study/Design • Funding Assistance • Regulatory Permitting Program Consultants: • Hazen and Sawyer: Interceptor Design/EA • Highfill Infrastructure: Kerner’s Mill Design • Southeastern Electrical Consultants: Kerner’s Mill PS Design • Carolina Ecosystems: Environmental Field Support • Hydromax USA: Pipeline Inspection • Allied Associates: Surveying • Sanborn: Aerial Topography • S&ME: Geotechnical • Clemson Engineering Hydraulics: Physical Modeling

6. South fork improvements programoverview Kerner’s Mill PS and Force Main Design Lead: Highfill Linville Springs & Wexford PS Design Lead: CCUC MCCIPS and Force Main AEWWTP Equalization Facilities AEWWTP Aeration Upgrades(New) MCWWTP Power Generation Upgrades(New) Design Lead: Black & Veatch South Fork Interceptors Design Lead: Hazen and Sawyer SSES Projects Design Lead: Several

7. General program statusproject update – Optimization Study Study Completed in 2013-2014 • Aeration/DO Evaluation • Gas Utilization Evaluation • Sidestream Treatment Evaluation for N and P • Chlorine Control • Performance Management System • Energy Management Via Ammonia Control • Interplant Pumping Control System Result: AEWWTP Aeration Upgrade and Power Generation Projects Initiated

8. South Fork Program projects Additional Program Projects • Process and Energy Optimization Study for AEWWTP and MCWWTP • Program Funding • Program Funding Application and Administration for State Revolving Fund Loan • Federal Funding Screening and Application for all 2014 CIP projects Other Projects Added to the Program • AEWWTP Equalization Facilities • AEWWTP Aeration Improvements • MCWWTP Power Generation Upgrades • MCWWTP Blower Upgrades Funding

9. Program financial updateprogram budget - construction Current Anticipated Program Construction Cost: $98,320,000 • MCWWTP CIPI: $51,060,000 • MCWWTP Transfer Force Main: $4,850,000 • AEWWTP Day Tanks: $9,000,000 • AEWWTP Aeration System: $4,700,000 • South Fork Interceptor Contract 1: $12,550,000 • South Fork Interceptor Contract 2: $5,360,000 (estimated) • Kerner’s Mill Force Main: $3,200,000 (estimated) • Kerner’s Mill Pump Station Upgrade: $1,600,000 (estimated) MCWWTP Power Generation: $6,000,000 (estimated) Program is currently approximately $8M under budget

10. General financial updateprogram funding SRF CS370399-08 • $70,500,000 Loan Granted (2% rate) • Funds MCCIPS, Force Main, AEWWTP Equalization SRF CS370399-09 • $9,399,200 Loan Granted (2% rate) • Funds SSES Projects: Peters Creek, 21st Street, Ardmore Basin No. 1 SRF CS370399-10 • $1,079,400 Loan Granted (0% rate) • Funds AEWWTP Aeration System Upgrade SRF CS370399-11 • $6,003,772 Loan Granted (0% rate) • Funds MCWWTP Power Generation Facilities Future Application • MCWWTP Blower Replacement • South Fork Interceptors

11. program schedule update Red text indicates projects currently in construction

12. General program statusproject update - MCCIPS Muddy Creek WWTP Consolidated Influent Pumping Station • 82 mgd Influent PS • Expandable to 138 mgd • Screening/Grit Removal • 9.5 mgd Transfer PS & 30” Force Main • Expandable to 30 mgd • Odor Control • 2 - 1 MG Day Tanks • 2 – 3.9 MG Storm EQ Basins • Electrical Switchgear Replacement • NPW Pump Replacement • Demolition of Exist Primary Treatment and Influent PS • Ferric Chloride Storage/Feed

13. General program statusproject update - MCCIPS

14. General program statusproject update – AEWWTP Elledge WWTP Equalization • Objective: • Combine AEWWTP and MCWWTP Flows and Equalize Diurnal Variation • 2 – 2.0 MG Day Tanks w/ Vertical Mixers • Rate Control Structure Elledge Aeration Upgrades • Objective: • Segment Aeration Basins into 4 independent DO Control Zones • Results: • Reduce air requirements by 7,300 scfm • Approximate Power Savings: $186,000/yr • Approximate 3-4 yr payback

15. General program status project update – MCWWTP Power Generation MCWWTP Power Generation • 1 - 1.1 MW Dual Fuel Engine Generator • Self Enclosed Outdoor Unit • 800kW Capacity on Digester Gas • 1.1 MW Emergency Capacity on Natural Gas • Power Supplied to Grid • Digester Gas • Cleaning: particulates, moisture, H2S • Compressor via Blowers • Waste Heat • Hot Water for Digester Heating • Approximately 8 yr payback

16. General program statusproject update – Interceptors Contract 1 • 23,900 LF of 54” pipe • Pipe Material: FRP with DIP at road crossings Contract 2 • 8,860 LF of 15-42” pipe • Pipe Material: FRP (42”), DIP (42”), Clay (15”/18”)

17. South fork program early successes Pumping System Final Capacity Refined at 30% Design • Reduced due to Muddy Creek Basin Master Plan and South Fork Basin Refinement • Reduce PS Cost and Deferred Initial Equipment (Approx. $1M) • No Impact to Aggressive Schedule for South Fork Basin Improvements

18. South fork program early successes Projects Deferred Program Manager was Able to Make Effective, Ongoing Decisions Based on Collective Information Two significant Program Interceptor Projects were Deferred ($11M) • South Fork Basin MP Re-calibration Efforts Completed and Assessed Before Detailed Design Commenced • Reduced Program Construction and Engineering Cost • No Impact to Aggressive Schedule for South Fork Basin Improvements

19. Consolidated industrial allocation tracking Muddy Creek WWTP Archie Elledge WWTP Transfer Force Main 19

20. South fork program early successes The Program Team is Driving Effective and Open Collaboration • Multiple Projects • MCWWTP Clarifier Improvements Project • Collection System Master Plan Project • South Fork Program • Multiple Engineering Firms Provide Collective Decision Making • Winston-Salem • Black & Veatch • Hazen & Sawyer • Highfill Infrastructure Engineering Winston-Salem is Benefiting from Collective Expertise and Effective Collaboration

21. South fork program early successes Benefiting from Effective Collaboration • Exchanged Scope Between MCWWTP Clarifier Improvements Project and Program Project • Deferred Sitework to Program; • Moved Clarifier Splitter Structure to Clarifier Project • Evaluating and Coordinating Project Sequencing • Interceptor Designers Considered “Replace in-place” concept to avoid considerable rock removal along alignment • Program Manager Evaluated Interceptor Sections and Impact on MCWWTP Flows • Evaluated Early Milestones in PS Project to Incorporate Higher Influent Flows to Allow full “replace in-place” Without Delay to Program Completion

22. South fork program early successes Significant Benefits in Bidding and Construction • Significant Contractor interest including in some cases 15 bidders for a project. • Consolidated and coordinated construction administration efforts • Consolidated database for construction documents and records to keep things organized for CCUC

23. conclusions Unique Program Management Approach Has Created Value for CCUC • Allows for Expediting Relief of South Fork Basin While Concurrent Projects are Completed • Allowed to Initiate Projects without “Final” design criteria in order to Expedite Completion • Consolidated “like” Efforts Increasing Efficiency and Reducing Cost • Greatly Reduced CCUC Staff Requirements for a Complex set of Projects • Single Point of Responsibility with a High Level of Collaboration Between Team Members – Increasing Quality and Value.