Detroit Water and Sewerage Department Department Sewer Collection System Sewer Collection System Maintenance and Rehabilitation Update Update Samuel A Smalley PE Samuel A. Smalley, PE Assistant Director Asset Maintenance Group
Sewer Collection System Maintenance and R h bili Rehabilitation Update i U d • DWSD sewer collection system overview overview • Sewer maintenance improvements • Rehabilitation program for sewer collection system collection system • CIPP Process
Asset Maintenance Group Asset Maintenance Group • Mechanical Maintenance Division (236 FTE) Mechanical Maintenance Division (236 FTE) • Maintenance and Repair Division (326 FTE) • Engineering – Major Pipeline, Urban Pipeline, i i j i li b i li 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 System Detroit Sewer Collection System • 3 400 miles of sewer system piping 3,400 miles of sewer system piping • 2,300 miles of lateral sewers • 13 sewer lift stations in Detroit 3 lif i i i • 78 outfalls to Detroit River and Rouge River • 9 drainage districts in Detroit • 4 maintenance yards 4 maintenance yards
DWSD SEWER SERVICE AREA
Detroit Sewer Pipe Class and Length Detroit Sewer Pipe Class and Length Type of Sewer yp Typical Sizes yp Length g Total 3,383 miles Lateral 6 to 24 inches 2,258 miles Connector 24 to 48 inches 559 miles Trunk Trunk 48 to 60 inches 48 to 60 inches 483 miles 483 miles Interceptor Large diameter 83 miles
DWSD Large Diameter Sewers DWSD Large Diameter Sewers
9 DETROIT SEWER DISTRICTS
Detroit Section Maps – Water and Sewer
DWSD Maintenance DWSD Maintenance Districts
Sewer System Maintenance Improvements
Sewer System Maintenance Sewer 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 video metal detectors, pole camera, rebuilt sewer video truck • Engaging employees at all levels of the g g g p y organization – increased training and seek out input and bright ideas
Sewer System Maintenance Sewer System Maintenance • Eliminate roadblocks to production Eliminate roadblocks to production • Moved many employees back to day shift • QA/QC – random sample inspections of Q /QC d l i i f rodding with pole camera and video truck • Management by walking around • Carrot and stick for overtime work • Establish useful metrics and measure performance performance
Rotating Jet Nozzle Rotating Jet Nozzle
AMG Performance Scorecard Maintenance & Repair Division 2009 ‐ 10 Catch Basins Cleaned / Repaired Combined Yards (Approx. 90,000 in System Goal Rep.>1% or .006) 1,400 Catch Basin Work Orders (New) Catch Basin Work Orders (Completed) 1,200 Catch Basins Goal ers mber of Work Orde Backlog of Catch Basin WOs, measured in total number of open Wos 1,000 907 889 816 801 764 800 756 698 Nu 790 600 581 600 515 513 501 573 491 424 371 382 353 495 349 371 371 400 400 331 331 487 487 544 445 359 186 459 328 390 115 200 267 90 269 163 51 240 0 Jul 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 91 NOTE: Total Work Orders = Previous Month's Backlog of Work Orders + This Month's New Work Orders
Lateral Sewer Rodding/Cleaning Lateral Sewer Rodding/Cleaning • 2007 – 40 miles • 2008 • 2008 – 75 miles 75 miles • 2009 – 105 miles • 2010 – on pace to hit 400+ miles • Goal is to clean 700 miles annually
AMG Performance Scorecard Maintenance & Repair Division 2009 ‐ 10 60 Sewer Rodding/Combined Yards L 50 e n g t h 40 c l e a n 30 e d i n 20 m m i l e 10 s 0 Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul 2010
MAINTENANCE & REPAIR CENTRAL YARD PERFORMANCE SCORE CARD Sewer Rodding Maintenance & Repair Central Yard- 2009-10 Catch Basins Cleaned or Repaired Maintenance & Repair: Central Yard-2009-10 3 180 160 2 n miles 140 Length cleaned in number of jobs completed d 2 120 100 1 80 60 1 40 20 0 Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul 0 2009 2010 Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul 2009 2010 Number of Mains Repaired by DWSD Personnel Number of Services Repaired or Installed Maintenance Maintenance & Repair: Central Yard-2009-10 & Repair: Central Yard-2009-10 300 30 250 25 mpleted 200 leted 20 number of jobs com number fo jobs comp 150 15 100 10 50 5 0 Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul 0 2009 2010 Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul 2010 2009 YARD TO YARD COMPARISON Sewer Rodding Maintenance & Repair Yard to Yard Catch Basins Cleaned or Repaired Maintenance & Number of Mains Repaired by DWSD Personnel comparison - July 2010 Number of Services Repaired or Installed Maintenance Repair Yard to Yard Comparison - July 2010 Maintenance & Repair - Yard to Yard Comparison & Repair Yard to Yard Comparison - July 2010 July 2010 160 25 900 45.0 EAST YARD EAST YARD CENTRAL YARD 140 EAST YARD 800 40.0 NORTH YARD 20 120 700 35.0 WEST YARD WEST YARD 30.0 600 es 100 100 Length cleaned in mile number of jobs completed d 15 number of jobs completed number of jobs completed 500 25.0 80 20.0 NORTH YARD 400 WEST YARD 10 60 NORTH YARD 15.0 300 WEST YARD 40 10.0 5 200 CENTRAL YARD 20 5.0 100 NORTH YARD CENTRAL YARD CENTRAL YARD ,0 EAST YARD 0 0.0 0 0
Geographical Information Systems
DWSD Sewer Rehabilitation DWSD Sewer Rehabilitation Program Program
Sewer Rehabilitation Update Sewer Rehabilitation Update • Contractor based CIP program p 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’s • Intent to reduce inflow and infiltration, improve I t t t d i fl d i filt ti i customer service, reduce maintenance issues, increase system capacity without expansion y p y p • Current Contract – 3 years $80 million contract with Inland Waters Pollution Control
SEWER CLEANED SEWER LINED CONTRACT # Linear Foot Miles Linear Foot Miles CS-963 8,990 1.7 8,990 1.7 CS 1164 CS-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 Sewer CIPP 4 6 Brick Sewer
CIPP – 4’6” Brick Sewer CIPP 4 6 Brick Sewer
CIPP – 4’6” Brick Sewer CIPP 4 6 Brick Sewer
CIPP – 4’6” Brick Sewer CIPP 4 6 Brick Sewer Before 9 Days Later
Outfall CIPP Rehabilitation
CIPP – Technical Envelope CIPP Technical Envelope Diameters Diameters 8” to 108” 8” to 108” Effluent Temperature Effluent Temperature Up to 130 Up to 130° ° F F pH Range pH Range 1.0 to 10.0 1.0 to 10.0 Pipe Condition Pipe Condition Fully / Partially Fully / Partially Deteriorated Deteriorated Bends and Turns Bends and Turns Up to 90 Up to 90° ° Offset Joints Offset Joints Yes Yes Diameter Changes Diameter Changes Yes Yes Install Length* Install Length* g Up to 1200’ Up to 1200’ p Host Pipe Material Host Pipe Material All Materials All Materials * Depends on Diameter
CIPP CIPP – Material Makeup Material Makeup • Liner Liner – 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 CIPP – Design Calculations Design Calculations • Design Parameters Based on ASTM F1216 Design Parameters Based on ASTM F1216 – Pipe Condition – Pipe Diameter p – Pipe Ovality – Ground Cover – Water Table – Live Loads – Flexural Modulus
CIPP Process CIPP ‐ Process • Clean and Inspect via CCTV prior to lining Clean and Inspect via CCTV prior to lining • Manufacture custom sized liner (i.e. wet ‐ out) • Install Liner by Inversion ll i b i • Cure Liner (Steam or Hot Water) • Cut Ends and Reinstate Laterals • Final Inspection and Report completed by Final Inspection and Report completed by CCTV
Wet ‐ out Wet ‐ out Impregnated Pinch Point Liner Resin Slug g Roller Bed
Liner Installation Liner Installation Impregnated Liner Preparing Liner Fasten Liner to Column
Liner Installation Liner Installation Impregnated Liner Air Inversion Water Inversion Tower Impregnated Liner
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