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Chemical Grouting of Sanitary Sewers

Chemical Grouting of Sanitary Sewers. Illinois Section CSWEA Collection System Seminar June 11, 2009 Derek J. Wold, P.E. Baxter & Woodman, Inc. Chemical Grouting of Sanitary Sewers Introduction. Rehabilitation Alternatives Why use Chemical Grout Chemical Grout Overview Specifications

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Chemical Grouting of Sanitary Sewers

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  1. Chemical Grouting of Sanitary Sewers Illinois Section CSWEA Collection System Seminar June 11, 2009 Derek J. Wold, P.E. Baxter & Woodman, Inc.

  2. Chemical Grouting of Sanitary Sewers Introduction • Rehabilitation Alternatives • Why use Chemical Grout • Chemical Grout Overview • Specifications • Costs • Case Studies

  3. Chemical Grouting of Sanitary Sewers Introduction • Purpose of Rehabilitation • Structural Repair • Infiltration / Inflow (I/I) Removal • Extend Service Life

  4. Chemical Grouting of Sanitary Sewers Introduction • Rehabilitation Alternatives • Lining (CIPP, Slip Lining) • Pipe Bursting • Open Cut Replacement • Chemical Grouting

  5. Chemical Grouting of Sanitary Sewers Overview • Why utilize chemical grout • Less expensive than other rehabilitation methods • Extends service life • Remove I/I • When to use chemical grout • No structural defects • Joint leaks or root intrusion • No sags

  6. Chemical Grouting of Sanitary Sewers Mainline Sewer Grouting • Equipment • Packer • TV Camera • Gauges • Winch • Types of grout

  7. Chemical Grouting of Sanitary Sewers Service Connection and Lateral Grouting • Equipment used • Access

  8. Chemical Grouting of Sanitary Sewers Specifications • Standards • Rehabilitation of Sewers ASTM 2304. • Sealing Sewer Manholes ASTM 2414. • Specifications • Preparatory Cleaning and Televising • Grout Material • Joint Testing • 3 psi greater than groundwater pressure, or • ½ psi per foot • Maximum of 10 psi • Maximum pressure loss = 1 psi per 15 sec.

  9. Chemical Grouting of Sanitary Sewers Specifications • Joint Sealing • ½ gallon per inch diameter • Pump to “refusal” • Documentation • Joint Sealing Verification • Repeat Joint Testing • Warranty • Retest after 3 year

  10. Chemical Grouting of Sanitary Sewers Specifications • Service Connection Grouting • Test and Seal Specifications • 3 gal per connection • Lateral grouting

  11. Chemical Grouting of Sanitary Sewers Costs • Mainline • Service Tee • Lateral • Manholes

  12. Chemical Grouting of Sanitary Sewers Case Studies • Downers Grove Sanitary District • E1-014 Flow Basin • IM-12A Flow Basin • Village of Lisle

  13. Downers Grove Sanitary District Background • Special unit of local government • Responsible for wastewater collection and treatment • Operates 237 miles of public sewers • Operates 9 pumping stations • Operates one WWTF rated at 11 MGD • 20 square mile service area • Western suburbs of Chicago, Illinois • 21,062 building connections • Serves approximately 62,000 people

  14. Downers Grove Sanitary District35 miles west of Chicago map

  15. Downers Grove Sanitary DistrictSewer Rehab Policy – I/I Reduction • Select Target Rehabilitation Basin • Develop Criteria / Scoring System based on: • Frequency of SSOs • Frequency of Basement Backups • Flow Monitoring Data • System Age

  16. Downers Grove Sanitary DistrictTarget I/I Rehabilitation Basin • Select I-H-9 Flow Basin as first target basin • 188 Building connections • Approx. 8,300 LF of sewer and 32 manholes • Flow Data • 60 gpm ADF to 1,200 gpm peak flow • Preliminary SSES work and results • Flood testing • Smoke testing • Small amount of I/I identified • Inadequate storm drainage

  17. Downers Grove Sanitary DistrictIH-9 Flow Basin • Total Cost – Approx $1,500,000 • Line 100% of mains - $418,000 • Grout or Replace 100% Manholes - $47,000 • Line or replace 96% Services - $1,013,000 • Results • I/I reduced by 60-80 percent • No overflows in I-H-9 flow basin • Unable to produce air tight system • Impact of I/I Removal on inadequate storm drainage

  18. Downers Grove Sanitary DistrictE-1-014 Flow Basin • Basin Characteristics • 8,021 LF of 8-inch VCP sewer • 165 services • 28 manholes • Flow data • ADF = 25 gpm • Peak Flow = 750 gpm • Wetlands

  19. Downers Grove Sanitary DistrictE-1-014 Flow Basin • Grout 100% of mains and manholes • Results • Peak flow reduction of 45% • Costs • $300,000

  20. Downers Grove Sanitary DistrictI-M-012A Flow Basin • Basin Characteristics • 9,442 LF of sewer • 211 services • 34 manholes • Flow data • 50 gpm to 1200 gpm • Compliance Commitment Agreement with IEPA

  21. Village of LisleBeau Bien Area • Project Area • 6,314 LF of 8-inch sewer • 97 services • Rehabilitation • 3,314 LF of grouting • 3,080 LF of CIPP • 88 services grouted • 9 laterals lined • Costs

  22. Questions? • Derek J. Wold, P.E. • Baxter & Woodman, Inc. • 708-478-2090 • dwold@baxterwoodman.com

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