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Detroit Water and Sewerage DepartmentDepartment

Sewer Collection SystemSewer Collection System Maintenance and Rehabilitation 

UpdateUpdate

Samuel A Smalley PESamuel A. Smalley, PE

Assistant Director Asset Maintenance Group

Sewer Collection System Maintenance and R h bili i U dRehabilitation Update

• DWSD sewer collection system overviewoverview

• Sewer maintenance improvements• Rehabilitation program for sewer collection systemcollection system

• CIPP Process

Asset Maintenance GroupAsset Maintenance Group

• Mechanical Maintenance Division (236 FTE)Mechanical Maintenance Division (236 FTE)

• Maintenance and Repair Division (326 FTE)

i i j i li b i li• Engineering – Major Pipeline, Urban Pipeline, and Planning (9 FTE)

• Responsible for all water mains, sewer mains, water booster stations, sewer lift stations, DWSD owned buildings, and 900+ vehicle and construction equipment fleet

Detroit Sewer Collection SystemDetroit Sewer Collection System

• 3 400 miles of sewer system piping3,400 miles of sewer system piping

• 2,300 miles of lateral sewers

3 lif i i i• 13 sewer lift stations in Detroit

• 78 outfalls to Detroit River and Rouge River

• 9 drainage districts in Detroit

• 4 maintenance yards4 maintenance yards

DWSD SEWER SERVICE AREA

Detroit Sewer Pipe Class and LengthDetroit Sewer Pipe Class and Length

Type of Sewer Typical Sizes Lengthyp yp g

Total 3,383 miles

Lateral 6 to 24 inches 2,258 miles

Connector 24 to 48 inches 559 miles

Trunk 48 to 60 inches 483 milesTrunk 48 to 60 inches 483 miles

Interceptor Large diameter 83 miles

DWSD Large Diameter SewersDWSD Large Diameter Sewers

9 DETROIT SEWER DISTRICTS

Detroit Section Maps – Water and Sewer

DWSD MaintenanceDWSD MaintenanceDistricts

Sewer System Maintenance Improvements

Sewer System MaintenanceSewer System Maintenance

• Refurbished (11) and replaced (3) vactors( ) p ( )• Factory training for fleet mechanics• Current fleet – 26 vactors and 1 Super Sucker• Purchase and deployment of better equipment , tools, and nozzles – rotating jet nozzles, root kits, metal detectors pole camera rebuilt sewer videometal detectors, pole camera, rebuilt sewer video truck

• Engaging employees at all levels of the g g g p yorganization – increased training and seek out input and bright ideas

Sewer System MaintenanceSewer System Maintenance

• Eliminate roadblocks to productionEliminate roadblocks to production

• Moved many employees back to day shift

Q /QC d l i i f• QA/QC – random sample inspections of rodding with pole camera and video truck

• Management by walking around

• Carrot and stick for overtime work

• Establish useful metrics and measure performanceperformance

Rotating Jet NozzleRotating Jet Nozzle

AMG Performance ScorecardMaintenance & Repair Division 2009‐10

Catch Basins Cleaned / RepairedCombined Yards

1,200

1,400

ers

Catch Basin Work Orders (New)

Catch Basin Work Orders (Completed)

Catch Basins Goal

(Approx. 90,000 in System Goal Rep.>1% or .006)

907

816

698756

801

889

764800

1,000

mbe

r of W

ork

Ord

e

Backlog of Catch Basin WOs, measured in total number of open Wos

331

790

487

573

600

491382

349

501

371

515

371

513

353

581

424

495

400

600

Nu

544445

331

269163

51

487

240

459 390328 186115

90 267

371359

200

400

91

0Jul 09 Aug 09 Sep 09 Oct 09 Nov 09 Dec 09 Jan 10 10-Feb Mar 10 Apr 10 May 10 Jun 10 Jul 10

NOTE: Total Work Orders = Previous Month's Backlog of Work Orders + This Month's New Work Orders

Lateral Sewer Rodding/CleaningLateral Sewer Rodding/Cleaning

• 2007 – 40 miles 

• 2008 75 miles• 2008 – 75 miles

• 2009 – 105 miles

• 2010 – on pace to hit 400+ miles

• Goal is to clean 700 miles annually

AMG Performance ScorecardMaintenance & Repair Division 2009‐10

60Sewer Rodding/Combined Yards

50Leng

t

h

30

40

cle

a

n

20

e

d

in

m

10

mil

e

s

0

Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul2010

MAINTENANCE & REPAIR CENTRAL YARDPERFORMANCE SCORE CARD

140

160

180

d

Catch Basins Cleaned or Repaired Maintenance & Repair: Central Yard-2009-10

2

3n

mil

es

Sewer Rodding Maintenance & Repair Central Yard-2009-10

0

20

40

60

80

100

120

Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul

nu

mb

er o

f jo

bs

com

ple

ted

2009 2010

0

1

1

2

Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul

Len

gth

cle

aned

in

2009 2010

20

25

30

lete

d

Number of Mains Repaired by DWSD Personnel Maintenance & Repair: Central Yard-2009-10

200

250

300

mp

lete

d

Number of Services Repaired or Installed Maintenance & Repair: Central Yard-2009-10

0

5

10

15

Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul

nu

mb

er f

o j

ob

s co

mp

2009 2010

0

50

100

150

Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul

nu

mb

er o

f jo

bs

com

2009 2010

YARD TO YARD COMPARISON

EAST YARD

100

120

140

160

d

Catch Basins Cleaned or Repaired Maintenance & Repair Yard to Yard Comparison - July 2010

NORTH YARD

WEST YARD600

700

800

900

Number of Services Repaired or Installed Maintenance & Repair Yard to Yard Comparison - July 2010

CENTRAL YARD EAST YARD

WEST YARD

20

25

Number of Mains Repaired by DWSD Personnel Maintenance & Repair - Yard to Yard Comparison

July 2010

EAST YARD

30.0

35.0

40.0

45.0

es

Sewer Rodding Maintenance & Repair Yard to Yard comparison - July 2010

CENTRAL YARD ,0

NORTH YARDWEST YARD

0

20

40

60

80

100

num

ber

of jo

bs c

ompl

eted

CENTRAL YARD

EAST YARD

0

100

200

300

400

500

num

ber

of jo

bs c

ompl

eted

NORTH YARD

0

5

10

15

num

ber

of jo

bs c

ompl

eted

CENTRAL YARD NORTH YARD

WEST YARD

0.0

5.0

10.0

15.0

20.0

25.0

Len

gth

cle

aned

in

mile

Geographical Information Systems

DWSD Sewer RehabilitationDWSD Sewer Rehabilitation ProgramProgram

Sewer Rehabilitation UpdateSewer Rehabilitation Update

• Contractor based CIP programp g• Lining, pipe bursting, open cut replacement, and slip lining options – CIPP primary option

• Current rehabilitation program started 1996• 264 miles of sewer lined since early 1980’sI t t t d i fl d i filt ti i• Intent to reduce inflow and infiltration, improve customer service, reduce maintenance issues, increase system capacity without expansiony p y p

• Current Contract – 3 years $80 million contract with Inland Waters Pollution Control

CONTRACT # SEWER CLEANED SEWER LINED

Linear Foot Miles Linear Foot Miles

CS-963 8,990 1.7 8,990 1.7

CS 1164CS-1164 20,100 3.8 20,100 3.8

CS-1215 22,190 4.2 22,190 4.2

CS-1256 46,230 8.8 46,230 8.8

CS-1325 157,885 29.9 130,956 24.9

CS-1368 825,490 156.4 797,558 151.1

DWS-864 241,474 45.8 200,500 38.0

DWS-865 222,244 42.1 165,575 31.4

DWS-876 63,003 12.0 Ongoing Ongoing

DWS-877 81,905 15.6 Ongoing Ongoing

TOTALS 1,689,511 320.3 1,392,099 263.9

CIPP – 4’6” Brick SewerCIPP  4 6  Brick Sewer

CIPP – 4’6” Brick SewerCIPP  4 6  Brick Sewer

CIPP – 4’6” Brick SewerCIPP  4 6  Brick Sewer

CIPP – 4’6” Brick SewerCIPP  4 6  Brick Sewer

Before 9 Days Later

Outfall CIPP Rehabilitation

CIPP – Technical EnvelopeCIPP  Technical EnvelopeDiametersDiameters 8” to 108”8” to 108”Effluent TemperatureEffluent Temperature Up to 130Up to 130°° FFpH RangepH Range 1.0 to 10.01.0 to 10.0Pipe ConditionPipe Condition Fully / Partially Fully / Partially

DeterioratedDeterioratedBends and TurnsBends and Turns Up to 90Up to 90°°Offset JointsOffset Joints YesYesDiameter ChangesDiameter Changes YesYesInstall Length*Install Length* Up to 1200’ Up to 1200’ gg ppHost Pipe MaterialHost Pipe Material All MaterialsAll Materials

* Depends on Diameter

CIPP Material MakeupCIPP – Material Makeup• LinerLiner

– Polyester Needle Felt Tube w/ Polyurethane Coating

– Thickness Designed to Structural Requirements– Container for Resin

• Resin System– Polyester, Vinyl Ester, or Epoxy Resin– Catalyst used to accelerate curing– Colored Dye added to assure resin saturation

CIPP Design CalculationsCIPP – Design Calculations• Design Parameters Based on ASTM F1216Design Parameters Based on ASTM F1216

– Pipe Condition– Pipe Diameterp– Pipe Ovality– Ground Cover– Water Table– Live Loads– Flexural Modulus

CIPP ProcessCIPP ‐ Process

• Clean and Inspect via CCTV prior to liningClean and Inspect via CCTV prior to lining

• Manufacture custom sized liner (i.e. wet‐out) 

ll i b i• Install Liner by Inversion

• Cure Liner (Steam or Hot Water)

• Cut Ends and Reinstate Laterals

• Final Inspection and Report completed byFinal Inspection and Report completed by CCTV

Wet‐outImpregnated LinerPinch Point

Wet‐out

Resin Slug Roller Bedg

Liner InstallationLiner InstallationPreparing Liner Fasten Liner to ColumnImpregnated Liner

Liner InstallationLiner InstallationAir Inversion Water InversionImpregnated Liner

Impregnated LinerTower

Curing g

Water Cure

Steam Cure

Cut Liner EndsCut Liner EndsCutting Liner End at

ManholeCut Liner End

Manhole

Lateral ReinstatementLateral Reinstatement

Final TVFinal TV

Existing Pipe

Relined Pipe

Quality ControlQuality Control

– Progress Meetings

Wet Out– Wet Out

– Inspection• Inspector Training• Inspector Training

• Testing

• Cook LogsCook Logs

• Liner Samples

• Post Inspection

CIPP T hl O C tCIPP – Trenchless vs. Open‐Cut

• JointlessJointless– eliminates infiltration, exfiltration, root intrusion

• Less ‐intrusive construction– Minimal ground repair, relieves environmental concerns

• Minimal Public Disruptionp– Reduced traffic congestion and social costs

• Installation productivity gains– Reduced Construction Time

CIPP P f Th h P fCIPP – Proof Through Performance

• Millions of LF installed World‐WideMillions of LF installed World Wide

• Inert material with indefinite life

S l i i h i d fl i• Structural pipe with increased flow capacity

• Applicable to a variety of pipe conditions, diameters, and locations

• Custom designed to meet conditions specifiedg p

Q i ?Questions?

Samuel A. Smalley, PEAssistant Director – Asset Maintenance GroupDetroit Water and Sewerage Department