REDUCTION OF SANITARY SEWER INFIL TRATION AND INFLOW IN A PUBLIC - - PowerPoint PPT Presentation

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REDUCTION OF SANITARY SEWER INFIL TRATION AND INFLOW IN A PUBLIC - - PowerPoint PPT Presentation

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REDUCTION OF SANITARY SEWER INFIL TRATION AND INFLOW IN A PUBLIC SEWER SYSTEM A CASE STUDY OF THE VILLAGE OF OAK LAWN'S REHABILITATION PROGRAM June 26, 2014 2:15 pm to 3:00 pm Jared Wendorf, PE, CDM Smith Repaired Fracture and Holes C S

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REDUCTION OF SANITARY SEWER INFIL TRATION AND INFLOW IN A PUBLIC SEWER SYSTEM A CASE STUDY OF THE VILLAGE OF OAK LAWN'S REHABILITATION PROGRAM

June 26, 2014 2:15 pm to 3:00 pm Jared Wendorf, PE, CDM Smith

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Repaired Fracture and Holes

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Acknowledgements

  • Larry Deetjen

Oak Lawn Village Manager

  • Jack Gallagher

Oak Lawn Village Engineer

  • Steve Barrett

Oak Lawn Public Works Director

  • Bill Meyer

Oak Lawn Sewers Crew Chief

  • Mandeera Wagle

CDM Smith Project Manager

  • Doug Youngblood CDM Smith Technical Lead

C S W E A -2 0 1 4 C o lle ctio n S y ste m s C o n fe re n ce

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Project Timeline

CSWEA-2014 Collection Systems Conference

2011 2012 2013 2014 2010 2015

Project Kickoff Begin Hydraulic Modeling Clean + Inspect Develop 2013 Rehab Approach Complete 2014 Rehab. Clean + Inspect Develop 2015 Rehab Approach Complete Master Plan Complete 2013 Rehab. Clean + Inspect Develop 2014 Rehab Approach Complete 2015 Rehab. Clean + Inspect Develop 2016 Rehab Approach

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Introduction to the Village of Oak Lawn Sewer S ystem

  • Oak Lawn incorporated in 1909
  • Approx 55,000 Residents
  • 8.5 Sq M iles
  • Sanitary Sewers installed M id-

Century

  • Separate Sewer Systems
  • Pipes are mostly clay

CSWEA-2014 Collection Systems Conference

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Hydraulic M odeling and Flow M onitoring

  • Objective –

Create a Sanitary Sewer M aster Plan—A Roadmap

– Comprehensive model of the entire system – Rainfall and flow data measured and integrated – Three Hydrograph Method

CSWEA-2014 Collection Systems Conference

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Hydraulic M odeling and Flow M onitoring

  • Identify potential problem areas
  • Prioritize use of limited funds

CSWEA-2014 Collection Systems Conference

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Cleaning and T elevised Inspections

  • Development of 2012 Program
  • Use M aster Plan to identify two areas at most risk

– Clean and Inspect approximately 16,600 lf of pipe in projected

future problem areas

– Inspect approx 100 manholes – Time of Project –

8 working days

– Average 2,075 ft / day

  • Next Steps

– Analyze inspections and develop rehabilitation plan

CSWEA-2014 Collection Systems Conference

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Cleaning of Sanitary Sewers and T elevised Inspections—Prioritization of Rehab

  • High Priority

– Risk of collapse / sinkholes – M ajor structural damage – M ajor infiltration potential

  • M edium Priority

– Some infiltration potential – Structural damage likely to degrade to major

damage

  • Low Priority

– M ineral deposits – Fine roots – Hairline cracks, small sags

CSWEA-2014 Collection Systems Conference

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Pipe fractures In 10962

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Pipe fractures In 10961

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Offset joints and Intruding taps at 7288

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Fractures at 7374

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Hammer Tap – Infiltration Around Edges

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Intruding break-in tap at 7249

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Develop Plan for 2013 Rehabilitation

  • Select rehabilitation methods to repair approx 10,000 ft of

pipe

– Options for pipe repair:

  • pipe replacement
  • slip lining
  • CIPP
  • Spot repairs
  • Short liners
  • Break in tap repairs (LCR)
  • Lateral Grouting

CSWEA-2014 Collection Systems Conference

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Develop Plan for 2013 Rehabilitation

  • Select rehabilitation methods to rehab approx 50 manholes

– Options for manhole repair:

  • Raising M anhole Lids
  • Chimney Seals
  • Chemical Grouting
  • Cementitious Resurfacing
  • Concrete Surfacing at M anhole/ Liner Interface
  • Pipe Seals

CSWEA-2014 Collection Systems Conference

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Refrigerated Truck Water Source or Steam Source

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CIPP rehabilitation

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CIPP rehabilitation

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CIPP rehabilitation

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Execute 2013 Rehabilitation

  • Repair approx 10,000 ft of pipe and Rehab approx 50

manholes based on 2012 inspections results

  • Clean and Inspect 10,000 additional ft of pipe and inspect

approx 100 additional manholes (two additional sewersheds)

  • Provide unit cost rates that the Owner can use to authorize

rehab of newly inspected pipes and manholes

  • Repair newly inspected pipes and manholes

CSWEA-2014 Collection Systems Conference

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2013 Rehabilitation Summary

CSWEA-2014 Collection Systems Conference

Area Manholes Rehabilitated CIPP Lining in 2013 Additional Rehab Area #1

29 of 32 (91%) 5,389 of 6,022 lf (89%) two spot repairs

Area #2

37 of 60 (62%) 4,488 of 10,255 lf (44%) 1 short liner, 1 LCR

Area #3

42 of 71 (59%) 5,182 of 12,303 lf (42%) 1 short liner, 1 LCR

Area #4

18 of 40 (45%) 2,985 of 6,258 lf (48%)

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Fractures and Hole in Pipe

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Repaired Fracture and Holes

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Fractures – Imminent Risk of Collapse

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Repaired Fractures

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Hole in Pipe Active Infiltration

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Location of Repaired Hole in Pipe Location of Infiltration Defect

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Fractures – Pipe Approaching Collapse

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Repaired Fractures

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Cast in Place Pipe Structural Integrity

CSWEA-2014 Collection Systems Conference

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Analysis of 2013 Rehabilitation

  • Identify common sources of problems

CSWEA-2014 Collection Systems Conference

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2014 Rehabilitation Work

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Creating a Sustainable Funding Source

  • 2012-2013 work was funded by Build America Bonds
  • The Village recognized the need for a sustainable funding

source

  • Benchmarking against similar communities showed that a

reasonable sewer rate increase was warranted

  • The funds from this increase are accounted for separately

in a fund allowing 1-2% of the system to be rehabilitated annually.

  • Spend approx $1M per year

CSWEA-2014 Collection Systems Conference

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Summary

  • The Village of Oak Lawn has successfully initiated a

comprehensive annual sanitary sewer rehabilitation program that is effective and sustainable.

  • The efficiency of the program increases with each year by

building upon specifications and improvements of prior years.

  • T
  • date, Oak Lawn has rehabilitated more than 20,000 linear

feet of pipe and 150 manholes, and is currently preparing for the next phase of rehab starting in Summer 2014.

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Lessons Learned

  • Emphasize the importance of the contractor walking the site
  • Hold a mandatory Pre-bid.
  • Communicate early and often with homeowners
  • Use LCR in combination with short liners
  • Have a protocol set up for resident issues
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Contact Information

Jared Wendorf, PE CDM Smith Chicago wendorfjw@cdmsmith.com