Update on the Metro Nashville Consent Decree Program. Scott Potter Ron Taylor

Transcription

1 Update on the Metro Nashville Consent Decree Program Scott Potter Ron Taylor 1

2 Why We Are Here Planned actions to meet Clean Water Act The types of projects that will be constructed The impacts of these projects The costs of the Program The benefits of the Program 2

3 What is a Consent Decree? The consent decree is an agreement based on enforcement for violations of the Clean Water Act between the following parties: Metro EPA U.S. Department of Justice Tennessee Department of Environment and Conservation Tennessee Attorney General 3

4 Nashville is Not Alone: Utilities with Consent Decrees Atlanta Birmingham Cincinnati Columbus, OH Indianapolis Louisville Northern KY San. Dist. No. 1 St. Louis $ 3 billion $ 3 billion $ 1.5 billion $ 2.5 billion $ 1.3 billion $ 850 million $ 880 million $ 4.7 billion 4

5 Program Communication Plan Proactive communication to advise Council Members in advance of project Community meetings as needed prior to construction On-going neighborhood communications during construction 5

6 Combined and Separate Sewer Systems 32 CSO Discharge Sites 6

7 Frequently Used Terms ISSUE: SSO Sanitary Sewer Overflows PLAN: CAP/ER Corrective Action Plan / Engineering Report ISSUE: CSO Combined Sewer Overflow PLAN: LTCP Long Term Control Plan 7

8 Key Provisions of Consent Decree 2 ½ years to develop plans: Corrective Action Plan / Engineering Report for SSOs Long Term Control Plan for CSOs 11-year implementation period after approval Stipulated penalties: $1,000 / SSO occurrence $3,000 / SSO occurrence after December

9 Current Status of Consent Decree Corrective Action Plan / Engineering Report for SSOs submitted September 2011 Long Term Control Plan for CSOs submitted September 2011 Regulatory Response: none to date Implementation: Proceeding with key elements of the Program 9

10 Progress in Reducing SSOs 1990: 164 SSOs 2007: 27 SSOs 10

11 Corrective Action Plan / Engineering Report Sanitary Sewer Overflows 11

12 CAP / ER Sources of Inflow and Infiltration (I / I) 12

13 CAP / ER Sewer Defects Identified by Televised Inspection 13

14 CAP / ER Defects identified in MWS sewers 14

15 CAP / ER Hydraulic Modeling for 2-year storm event 61 permanent and 144 temporary flow monitors 15

16 CAP / ER Hydraulic Modeling Hydraulic model identifies level of sewer surcharge in manholes during 2-year storm event. Project type alternatives modeled to reduce surcharging to acceptable levels. 16

17 CAP/ER Project Types Storage Tanks 17

18 CAP/ER Project Types Conveyance Improvements 18

19 CAP / ER Project Types Inflow / Infiltration Reduction Sewer Rehabilitation Cured-in-place Lining 19

20 CAP / ER Project Types Inflow / Infiltration Reduction Cured-in-place Lining 20

21 CAP / ER Project Types Inflow / Infiltration Reduction Service Line Reconnection 21

22 CAP / ER Project Types Sewer Rehabilitation Service Line Renewal 22

23 MWS Sewer Service Area Dry Creek Service Area 23

24 Dry Creek Projects Sewer Rehabilitation: 168,000 feet Conveyance Improvements: 7,900 feet (gravity) 22,900 feet (force main) Pumping Upgrades and Storage: 5 pumping station upgrades and one 10 MG tank 24

25 Whites Creek Projects Sewer Rehabilitation: 250,000 feet Conveyance Upgrades: 43,900 feet Storage Upgrades: 4 tanks totaling 31 MG 25

26 Whites Creek Projects Sewer Rehabilitation: 250,000 feet Conveyance Upgrades: 43,900 feet Storage Upgrades: 4 tanks totaling 31 MG 26

27 Central Projects Sewer Rehabilitation: 1,250,000 feet Conveyance Upgrades: 49,900 feet (gravity) 4,600 feet (force main) 2 pumping station upgrades and 6 storage tanks totaling 86 MG 27

28 Mill Creek Trunk Six miles of upsized sewer, ranging from 72 to 102 inches in diameter Extends from south of Briley near I-24 to the existing Barker Road / Omohundro storage facility Requires significant easement acquisition Estimated total cost: $200 M 28

29 Mill Creek / Opryland Storage Phase I: 15 MG Barker Road / Omohundro storage tank existing Phase II: New 15 MG tank on existing property Phase III: Four additional 15 MG tanks and 100 mgd pump station Estimated total cost of Phase II & III: $100 M 29

30 CAP / ER Cost Summary Total CAP / ER Cost: $770 million Storage 22% Rehabilitation 38% Conveyance 35% Pump Station 5% Whites Creek 17% Dry Creek 10% Central 73% 30

31 Long Term Control Plan for Combined Sewer Overflows 31

32 CSS Dry Weather Conditions 32

33 CSS Wet Weather Conditions 33

34 Combined Sewer Systems 772 Communities with CSOs 34

35 Nashville Combined Sewer System 35

36 Nashville Combined Sewer System 36

37 32 CSO sites in CSO sites in 2009 Reduced to 6 sites in

38 Water Quality Impacts Whites Creek Richland Creek Mill Creek Browns Creek 38

39 Water Quality Recreation Areas Riverfront Park Whites Creek Richland Creek Mill Creek Browns Creek Cleece s Ferry 39

40 CSO Alternatives Level of Control Performance curves modeled to identify cost-effective controls for typical rainfall year: Knee of the curve 40

41 Public Input Highlights Citizens Advisory Group and public meetings generated community input including: Value and concern for the Cumberland River Limit neighborhood impact Balance investment for improvements with impact to ratepayers Priority for green solutions when appropriate Resource allocation for CSO vs. non-cso sources 41

42 Recommended Level of Control CSO Site Overflows (typical year) Driftwood 0 Boscobel 0 Benedict & Crutcher 2 Schrader 2 Washington 11 Kerrigan 9 Total Cost: $300 million 42

43 Washington CSO Area 43

44 Washington CSO Facility Cost: $ 17 million Status: Operational 44

45 Washington Level of Control Recommended 11 45

46 Kerrigan CSO Area 46

47 Kerrigan CSO Discharge Site Greenway Diversion Structure Trash Trap 47

48 Kerrigan Level of Control Recommended 48

49 Green Initiatives for Consent Decree Program 49

50 Green Infrastructure Proposed for Combined Sewer Area 50

51 Proposed Green Infrastructure Project for Metro Parks Headquarters 51

52 Low Impact Development Manual Requires Capture for 1 Rainfall 52

53 Proposed MWS Incentive for Reducing Runoff to Combined Sewers Facilities installing green roofs would receive reduced sewer bills for 5 years 53

54 Cost Summary for Consent Decree CAP / ER $ 770 M 68% LTCP $ 300 M 26% Sewer Rehab (non-cap/er) $ 70 M 6% Total * $ 1,140 M 100% * Non-Escalated 54

55 Cost Impact for Consent Decree Developed cash flow needs for program Impact: No immediate need for rate adjustment Developing revenue study to address long-term funding needs 55

56 Consent Decree Implementation Revise CAP / ER and LTCP if necessary Program Manager CDM / AECOM Construction Manager GSP / CH2MHill Project Set Designers: 5 Teams for equalization tanks and pumping stations 8 Teams for conveyance improvements 15 Teams for sewer rehabilitation 6 Teams for SBE engineering firms 56

57 Questions & Comments 57