Post on 21-Aug-2020
Behind the $740 M: Building a
Technical Consensus for Indianapolis
Consent Decree Amendment No. 2
David Sherman, MWH
Chris Ranck, P.E., BCEE, D.WRE, RW Armstrong
Mark Jacob, Citizens Water
Steve Nielsen, P.E., Citizens Water
Doug Reichlin, P.E., Strategic Partners
Bob Masbaum, P.E., Citizens Water
June 21, 2012
Agenda
• Background
• Technical Basis for Amendment No. 2
• Summary
• Discussion
Background: Indianapolis Wastewater
System • Two Advanced Wastewater
(AWT) Plants
• Combined Sewer Area
with ~ 55 square miles,
130 outfalls
• ~ 3000 miles of sewers
• ~ 300 lift stations
• Service area population of
~ 800,000
• 20-year Combined Sewer
Overflow Long-Term
Control Plan (CSO LTCP)
approved January 2007
• Amended April 2009
• Amended December
2010
Background: 2007 Consent Decree (CD)
2007 Projects
• Central Deep
Tunnel
• Shallow Interplant
Connector (tunnel
flow pumped again)
• Rest of System
conveys to Deep
Tunnel
• Both Plants to 300
MGD
Background: Amendment No. 1
• CD Amendment No. 1
– Interplant Connector 90% Design One of
three projects representing $300 M over budget
– Original CD required NTP by 12/31/2008
– Presented to EPA Region 5 in May 2008
– Approved April 2009
– Set the stage for Amendment No .2
Southport
AWT
Deep Tunnel
Pump Station
Upper Pogues Run
Storage and Interceptor
Belmont
AWT
Upper Pogues Run
2021 Fall Creek
2025
White River
2021 Pleasant Run
2025
DTPS
2021
CSO 117
2012
DTPS
2016
CSO 117
2016
Eagle Creek
2018
CSO 008
2019
PE 007
2012 Temp Pump
Station
CD Amendment No. 1
CSO 008
2016
• 54 MG storage
• CSO 117 (4 years later)
• CSO 008 (3 years early)
• Eliminates three pump
stations
• 1 BG of additional
sewage captured
Technical Basis
• Hydraulic Modeling & System Data
• Benefits of Amendment No. 1
• Benefits of non-CD Projects
• Reliability & Sustainability
• Sewage Out Sooner
Control Measure Affected
(scope/method/size/schedule)
SWMM
Model
DRTC
Benefit
Non-CD
Project
Benefits
Plant &
System
Data
Sequencing
and
Reliability
15- FC Tunnel (size) ● ● ● ●
16- DRT (Pump station size) ● ● ● ●
18- Lower Pogues Run Box Conversion
(scope/size/schedule)
● ●
20- White River Tunnel PS (size) ● ● ● ●
22- Southport ANS Expansion (size/schedule) ● ● ● ●
23- Southport Disinfection (scope/size) ● ● ●
24- Southport Primary Clarifiers (scope/size) ● ● ● ●
25- Belmont Headworks (scope/size) ● ● ● ● ●
26- Southport Headworks (size/schedule) ● ● ●
27- Southport CSO Pump Station (scope already
addressed with DRTC pump station)
●
28- Southport EHRC (scope) ● ●
29- Pleasant Run Interceptor (method/schedule) ● ● ●
30- Eagle Creek: Belmont West Cutoff (scope) ● ● ●
31- Upper Pogues Run (size) ●
Technical Basis
2002 2009
> 100 Miles Sanitary
Interceptor Expansions
Hydraulic Modeling & System Data
> 240 Meters
(previous calibration was 23) > 1,300 MH Survey
Hydraulic Modeling & System Data
• 2007 CD is based on 2004 Analysis (2002 model)
• Need to be consistent with CD Post-Construction
Monitoring approved in 2007:
– Apply detailed SWMM model for 1996-2000
representative precipitation period
– Post-process 5-year simulation results to determine
compliance with performance criteria (Frequency and
Percent Capture)
• Total model simulation time = ~ 70 days
– Beware of weekend network reboots
– Alternate approach: < 24 hours via
supercomputer
Hydraulic Modeling & System Data
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
Original CD Current SWMM Model
Ave
rage
An
nu
al D
isch
arge
Vo
lum
e (M
G/y
ear
)
Comparison of Systemwide Average Annual CSO Volume: 2004 LTCP v. 2009 SWMM
Belmont PE Bypass
CSO Volume
7.7 BG/year - 2004 LTCP
5.4 BG/year - 2009 SWMM
• ~ 30% Lower CSO Volume than previously
modeled
• Planning-Level to
Detailed Modeling
• Constructed Early
Action Projects
(2004-2009)
• CSO Area Model
Recalibrations
Hydraulic Modeling & System Data
• Spreadsheet post-processing tools developed
based on future AWT process flowcharts
• Utilized model results from CSOs and AWTs
• Utilized historical AWT recycle data
Headworks300 MGD
WWPS30 MGD
WWSB No. 130 MG
Primary320 MGD
Secondary320 MGD
PEPS35 MGD
Recycle 20-30 MGD
008 to Tunnel
PDPS20 MGD
0-10 MGD
WWSB No.24 MG
Hydraulic Modeling & System Data
• Incorporate Tunnel
System
• Incorporate findings
of hydraulic profile
analysis
y = -0.047x2 + 2.871x + 22.99R² = 0.997
0
10
20
30
40
50
60
70
0 5 10 15 20 25 30
Vol (MG) Flow (MGD)
25 65
12 50
4 35
1 25
White River Tunnel
CSO 008, Pleasant Run, Lower Pogues Run, White River CSOs
No overflowcriteria
Deep PS60 MGD
Headworks180 MGD
PEPS
Primary225 MGD
Secondary225 MGD
EQ25 MG
Recy
cle
10 M
GD
WWPS75 MGD
WW
PS
to O
NS/
AN
S
Fall Creek Tunnel
White River Tunnel
CSO 008, Pleasant Run, Lower Pogues Run, White River CSOs
Fall Creek CSOs
2 OF/yr
4 OF/yr
Deep PS90 MGD
Headworks180 MGD
PEPS
Primary120+ MGD
Secondary250 MGD
EQ25 MG
Recy
cle
10 M
GD
WWPS75 MGD
WW
PS
to O
NS/
AN
S
Hydraulic Modeling & System Data
Belmont PEPS
Belmont Headworks, Primary,
Secondary
PEPS to Southport Step 1:
Belmont CSO 008 to Tunnel
Step 2:
Southport
& Tunnels
Tunnel Volume & Dewatering
Confirm Sizes
Southport Headworks, Primary,
Secondary
Step 3:
Compliance
Achieve Performance Criteria?
(CSO frequency / % Capture) Analysis Complete
Yes
No
Confirm Sizes
Confirm Sizes
Hydraulic Modeling & System Data
• Opportunity for Southport Secondary Expansion
300 300
277
252 251 258243
250 250 250233 236 238 238
0
50
100
150
200
250
300
350
0 1 2 3 4 5 6 7 8
Seco
nd
ary
Flo
w R
ate
(MG
D)
Days at Treatment Rate
Figure 1-4: 1996-2000 SWMM Post ProcessingMaximum Secondary Treatment Rate at Southport
300 MGD Secondary Treatment -120 MGD Dewatering
250 MGD Secondary Treatment -90 MGD Dewatering
Hydraulic Modeling & System Data
• Updated LTCP Configuration can
achieve the same performance criteria
with significant facility reductions
• Deep Tunnel: 224 MG 180 MG
• Deep Tunnel PS: 150 MGD 90 MGD
• Belmont AWT: 300 MGD 300 MGD
• Southport AWT: 300 MGD 250 MGD
• Final Configuration of CD Amendment
250 MG
Hydraulic Modeling & System Data
Hydraulic Modeling & System Data
ONS
Aeration
Primary
Clarifiers
ONS
Clarifiers
Bio-Roughing
120 MGD
350 MGD
60 MGD
200 MGD
60 MGD
150 MGD
120 MGD
150 MGD
WW Disinfection
& Discharge
Outfall 007
TF/SC
Aeration
8.3 MG
TF/SC
Clarifiers
135,000
sqft
Return Activated Sludge
Final Effluent
Outfall 006
0 MGD
200 MGD
60 MGD
0 MGD
120 MGD
150 MGD
Exist
New
Modify
• Original Trickling Filter/Solids Contact (TF/SC)
Process – Parallel to Oxygen Nitrification System
Return Activated Sludge
• Step Feed / Contact Stab Process - Final
ONS
Aeration
Primary
Clarifiers
ONS
Clarifiers
120 MGD
330 MGD
120 MGD
0 MGD
0 MGD
330 MGD
120 MGD
330 MGD
0 MGD
0 MGD
PE Bypass
Outfall 007
Final Effluent
Outfall 006
ANS
Step Feed
Contact Stab.
Aeration
17 MG
120 MGD
330 MGD
Exist
New
Modify
Hydraulic Modeling & System Data
Return Activated Sludge
Hydraulic Modeling & System Data
X
Hydraulic Modeling & System Data
Southport
AWT
Deep Tunnel
Pump Station
Belmont
AWT
Fall Creek
2025
White River
2021 Pleasant Run
2025
DTPS
2021
CSO 117
2012
DTPS
2017
CSO 117 & 118
2017
Eagle Creek
2018
CSO 008
2019
CSO 008
2017
PE 007
2012
Temp Pump
Station
• Better sequencing of
projects
• Utilized non-CD projects
• Early capture CSOs 008
and 118
• 6.2 BG of additional
sewage captured
Upper Pogues Run
Storage and Interceptor
Upper Pogues Run
2021
Reliability & Sustainability
Reliability & Sustainability
• Improved Reliability
– Extension of Deep Tunnel System: 7 Miles to
25 Miles
– Replaces in-line storage in Pogues Run Box
and eliminates 3 pump stations
• Sustainability
– No raingardens, etc. formally added to CD
– Reductions in pumping and treatment
expansions estimated to reduce carbon
footprint by ~ 6,000 – 20,000 tons CO2/year
414 MG/year
• EPA Review of proposed amendment weighed
project acceleration v. long term benefit
•
– Storage Tunnel Size: 224 MG
– Tunnel Dewatering: 150 MGD
– Southport Secondary: 300 MGD
– DRTC Completion: N/A
– Pleasant Run Completion: 2025
– Residual CSO Volume: 445 MG/year
– Sewage Captured Sooner:
2025
Sewage Out Sooner
642 MG/year
6.2 BG
Original 2007 CD First Proposal
180 MG
90 MGD
250 MGD
2021
2016
Accepted Proposal
250 MG
2017
3.5 BG
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
Cu
mu
lati
ve O
verf
low
Vo
lum
e R
em
ove
d (
MG
) Original LTCP
Amendment No. 2Original LTCP: 11 BG captured 2008-2025
Amendment No. 2: 14.5BG captured 2008-2025
Sewage Out Sooner
• No
improvement
in attainment
of
recreational
use from
95% to 99%
capture
•Better
attainment at
95% capture
than for total
sewer
separation
• Performance Criteria were maintained
Sewage Out Sooner
Summary
• Amendment No. 1 Approved April 2009
• Amendment No. 2 Proposed May 2009
• Amendment No. 2 Approved December
2010
• CD Performance criteria were maintained
• CD End date of 2025 was maintained
Summary • More detailed modeling was necessary
• Importance of working with EPA and
understanding what they value
• EPA required increased CSO capture for
acceptance
– Long-term residual CSO volume most important
– Acceleration was important, but less important
– Water quality & carbon footprint not important
Control Measure Project Original Cost Current Cost Savings How
Interplant Connector (DRTC) $161 $290 -$129 Increased size allowed other facility reductions
White River Tunnel and Pump Station $327 $173 $154 Reduced size of facility due to modeling/DRTC
Fall Creek Tunnel $316 $149 $167 Reduced size of facility due to modeling/DRTC
Lower Pogues Run $33 $88 -$55 More reliable tunnel solution due to modeling
Pleasant Run Interceptor $152 $182 -$30 More reliable tunnel solution due to modeling
Eagle Creek Interceptor $63 $33 $30 Belmont West Cutoff eliminated with alternative route
Upper Pogues Run $65 $26 $39 Reduced size of facility due to modeling
Pogues Run-Forest Manor $37 $4 $33 Smaller drainage area due to modeling
Riviera Club Storage Tank $27 $4 $23 Reduced size of facility due to modeling
Belmont Headworks $67 $0 $67 Eliminated facility due to DRTC/Modeling
Belmont Wet Weather Secondary Treatment $158 $67 $91 Alternative treatment method
Belmont Wet Weather Disinfection $12 $13 -$1 Facility size due to DRTC/Modeling
Southport CSO Pump Station $16 $0 $16 Eliminated need due to DRTC/Modeling
Southport Enhanced Hi-Rate Clarification $29 $0 $29 Eliminated need due to DRTC/Modeling
Southport Headworks $68 $24 $44 Reduced facility size due to DRTC/Modeling
Southport Wet Weather Primary Treatment $49 $8 $41 Reduced facility size due to DRTC/Modeling
Southport Wet Weather Secondary $65 $24 $41 Reduced facility size due to DRTC/Modeling
Southport Wet Weather Disinfection $30 $15 $15 Reduced facility size due to DRTC/Modeling
Belmont North Interceptor $125 $35 $90 Alternative route and force main solution/modeling
Fifth Incinerator $25 $0 $25 Eliminated need due to Modeling
Various STEP VE & Non CD Projects VE $150 $100 $50 Value engineering on non CD projects
TOTALS $1,975 $1,235 $740
Summary
Belmont Headworks $67 $0 $67
Belmont Wet Weather Secondary Treatment $158 $67 $91
Belmont Wet Weather Disinfection $12 $13 -$1
Southport CSO Pump Station $16 $0 $16
Southport Enhanced Hi-Rate Clarification $29 $0 $29
Southport Headworks $68 $24 $44
Southport Wet Weather Primary Treatment $49 $8 $41
Southport Wet Weather Secondary $65 $24 $41
Southport Wet Weather Disinfection $30 $15 $15
Control Measure Project Original Cost Current Cost Savings
TOTALS $1,975 $1,235 $740
Control Measure Project Original Cost Current Cost Savings
Interplant Connector (DRTC) $161 $290 -$129
White River Tunnel and Pump Station $327 $173 $154
Fall Creek Tunnel $316 $149 $167
Lower Pogues Run $33 $88 -$55
Pleasant Run Interceptor $152 $182 -$30
Acknowledgments
• Indianapolis DPW Director
– David Sherman (now MWH)
• Citizens Water
– Mark Jacob (prev DLZ), Steve Nielsen (prev
DPW)
• Barnes & Thornburg
– Fred Andes, Erika Powers, Susan Bodine
• RebuildIndy Program Team:
– Mike Musgrave (MWH), Doug Reichlin,
Chris Ranck
Discussion
• Questions?