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City Council Meeting Special Session

City Council Meeting Special Session. June 29, 2011. City Council Meeting – June 29, 2011. WORK SESSION [ 5:00pm ] – The Council will hear a presentation and discuss the Texas River Authority (TRA) plant upgrade, engineering plans, budget, and funding. SPECIAL SESSION [6:00pm]

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City Council Meeting Special Session

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  1. City Council Meeting Special Session June 29, 2011

  2. City Council Meeting – June 29, 2011 WORK SESSION [5:00pm] – The Council will hear a presentation and discuss the Texas River Authority (TRA) plant upgrade, engineering plans, budget, and funding. SPECIAL SESSION [6:00pm] 1. CALL TO ORDER 2. PLEDGES & INVOCATION • PUBLIC COMMENTS - 5 minutes each for items on the agenda - 2 minutes each for items not on the agenda

  3. City Council Meeting – June 29, 2011 Presentation, discussion, and possible action to approve $99,000 for engineering and design for capacity increase of Texas River Authority (TRA) plant to Alan Plummer & Assoc., Inc. [Carol Reed, Director of Public Utilities]

  4. Huntsville Regional Water Supply System Water Treatment PlantImprovements Project (January 2010) and Conversion to Expansion Project David Gudal, PE Alan Plummer Associates, Inc. June 29, 2011

  5. Overview • Background • Improvement Project • Expansion Project • Raw Water Pump Station Capacity • Raw Water Pipeline Capacity • Cost Update • Schedule

  6. Background - History of Projects

  7. City of Huntsville Water System Capacity Study (Crespo Consulting Services, Inc.) • Required water supply capacity (2011) is 11.9 MGD • Firm capacity is currently 9.0 to 9.3 MGD • Firm capacity is approximately 3 MGD below the TCEQ required water supply capacity

  8. WTP Improvement Project • Nitrate Removal: Add 4 GAC filters with nitrate removal capability • Meet CT (disinfection) requirements at WTP: Add 1.2 MG clearwell • Aging High Service Pumps: Install 4 new high service pumps on new clearwell • New backwash pumps • Chemical feed facilities improvements • Electrical and instrumentation improvements

  9. Proposed Process Flow Schematic – Improvement Project TENASKA FRONTIERS LIMITED (7 MGD MAXIMUM) Existing Gravity Filters (Typ. 4) Alum FeCl2 NaOH CITY OF HUNTSVILLE (10 MGD FIRM WITH NEW PS) Chlorine NH4 Chlorine Dioxide Solids Contact Clarifiers (Typ. 5) High Service Pumps (Firm capacity 12 MGD) New 1.2 MG Clearwell Raw Water Pumps (Firm Capacity 16 MGD) (7 MGD to Tenaska) In-Line Mixer TDCJ CUSTOMERS (2 MGD FIRM) 0.4 MG Clearwell New Gravity Filters - Nitrate Removal (Typ. 4)

  10. Plant Layout N N Chemical Storage Lime System Lime System Backwash Pump Station Backwash Pump Station Filters Clearwell 4 High Service Pumps 4 High Service Pumps High Service Pumps

  11. TRA Huntsville WTP Improvement Project - Treatment Unit Capacities Tenaska (7 MGD) Tenaska (7 MGD) *In nitrate removal mode two new filters dedicated to turbidity removal and two to nitrate removal

  12. TRA Huntsville WTP Expansion Project • Increase Raw Water Pump Station Capacity • Add one 4 MGD pump and VFD • Add additional stage to both existing 4 MGD pumps • Replace 2000 feet of 30” pipe with 36” pipe with higher pressure capability • Revise WTP process information for 12 MGD • Modify plans and design report to reflect 12 MGD capacity • Resubmit plans and design report to TCEQ for approval

  13. Raw Water Pump Station • Current Capacity • Firm : 16 MGD • 7 MGD contractedto Tenaska • 9 MGD for WTP • Need firm capacity of 19 MGD (12 City, 7 Tenaska) • Add 4 MGD Pump and Variable Frequency Drive (VFD) • Add one stage to two existing 4 MGD pumps

  14. Raw Water Pipeline • 23,000-foot pipeline installed in 1979 • 30-inch diameter • First 4,100 ft pressure class 125 • Remainder pressure class 103 • 900-foot replacement line, installed in 1999 • 36-inch diameter, pressure class 250 • Propose additional replacement of 2000-foot section • 36-inch diameter, pressure class 250

  15. Proposed Process Flow Schematic – Expansion Project TENASKA FRONTIERS LIMITED (7 MGD MAXIMUM) Existing Gravity Filters (Typ. 4) Replace 2000’ of 30” pipe with 36” pipe Alum FeCl2 NaOH CITY OF HUNTSVILLE (10 MGD FIRM WITH NEW PS) Chlorine Chlorine Dioxide Solids Contact Clarifiers (Typ. 5) High Service Pumps (Firm capacity 12 MGD) In-Line Mixer New 1.2 MG Clearwell Raw Water Pumps (Firm Capacity 20 MGD) (7 MGD to Tenaska) TDCJ CUSTOMERS (2 MGD FIRM) 0.4 MG Clearwell New Gravity Filters - Nitrate Removal (Typ. 4)

  16. TRA Huntsville WTP Expansion Project - Treatment Unit Capacities Tenaska (7 MGD) Tenaska (7 MGD) *In nitrate removal mode two new filters dedicated to turbidity removal and two to nitrate removal

  17. TRA Huntsville WTP Improvements ProjectOpinion of Probable Construction Cost Update *Does not include financing cost **Does include 10-percent contingency and 6-percent escalation (1 year)

  18. TRA Huntsville WTP Expansion to 12 MGD Schedule

  19. Discussion

  20. The City Council is currently in Executive Session and will reconvene before adjourning.

  21. City Council Meeting – June 29, 2011 PUBLIC COMMENTS - 2 minutes each ADJOURNMENT

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