I/I Reduction Planning In a Well Established Elgin Neighborhood - PowerPoint PPT Presentation

I/I Reduction Planning In a Well Established Elgin Neighborhood Presented By: Colby J. Basham Public Works Utility Superintendent City of Elgin Jeffrey W. Freeman, P.E., CFM, LEED AP Vice President Engineering Enterprises, Inc. March 19, 2013

Presentation Overview Background Information Study Area Overview Study Initiation Flow Monitoring Sewer System Evaluation Survey Fieldwork Storm & Sanitary Sewer Models Setup Rehabilitation Alternatives Analysis Financial Review & Summary Q&A

Background Information Study Area

Study Area Overview N. Commonwealth & Murray Reference Point

Study Area Overview

Study Area Overview

Study Area Overview City Has Invested Time & Money In The Storm & Sanitary Sewer Infrastructure Within This Area In the Past  City Lined Sanitary Sewer Mainlines Within Area Several Years Ago  City Conducted A Similar Study In 1998 Within This Area; Recommendations:  Line Storm Sewers To Prevent Exfiltration  Repair Identified Inflow Sources  Sanitary Sewer Hydraulic Improvements  July 24, 2010 Storm Event & McClure & Wilder Storm Manhole Failure  August 2010 Neighborhood Meeting

Study Initiation Information Gathering Work Items:  Neighborhood Kick-Off Meeting On 1/19/11  Land Surveying & Manhole Assessments Within Basins 1 – 4  Resident Survey Distribution & Collation

Study Initiation

Study Initiation

Flow Monitoring Flow Monitoring Overview:  Flow & Rainfall Monitoring From April 5, 2011 – May 17, 2011  Total of 6.56 Inches of Rain During Monitoring Period; Two Storms In Excess of 0.75 inches  April 19: 1.10 Inches In 13 Hours (2-Month Recurrence Interval Storm)  May 11: 1.49 Inches In 2 Hours (1-Year Recurrence Interval Storm)

Flow Monitoring Basin I&I Summary:  Basins With Excessive Continuous Infiltration: 2  Basins With Excessive Inflow & Rain-Induced Infiltration (RII): 2, 1, 3; 4 & 5 (Marginal)

SSES Fieldwork SSES Field Work Items:  Smoke Testing Summary Within Basins 1, 2 & 3  Sanitary Sewer Televising Within Basins No. 2 & 3  Dye Water Flooding At Five Intersections

SSES Fieldwork Boring Locations Estimated Drummer Soil Limits

SSES Fieldwork Boring Logs

SSES Fieldwork

Storm & Sanitary Sewer Models Storm Sewer Model Setup  Computer Modeled Storm Sewer Network Within StormCAD  Evaluated Existing Conveyance Capacity Under 2-Year, 5-Year & 10-Year Recurrence Interval Storms

Storm & Sanitary Sewer Models Sanitary Sewer Model Setup  Computer Modeled Sanitary Sewer Network Within SewerCAD  Evaluated Existing Baseline Domestic Waste Conveyance Capacity  All Sewers @ Less Than Or Equal To 22% Capacity  Verified Model Replicates Field Measured Dry Weather Flow Conditions  Verified Model Replicates Field Measured Wet Weather Flow Conditions  Utilized Model to Analyze Existing Conditions & Rehabilitation Alternatives Under 1-Year, 2-Year, 10-Year & 25-Year Recurrence Interval Storms

Rehabilitation Analysis Rehabilitation That Should Proceed No Matter What:  Reroute Water Main Around Manhole 1130  Remove Private Defects  Roof Leaders/Faulty Clean- Outs & Sump Pumps  Manhole Lining Within Basins No. 2 & 3  Properly Abandon Extra Service Connections On Oakley  Line Last Remaining Sewer Within Basin No. 2  Along Hamilton  Fix Storm Sewer Direct & Indirect Cross Connections

Rehabilitation Analysis Additional Rehabilitation Options Evaluated:  Sanitary Service Connection Lining (T-Liner)  Construct Outlet Storm Sewer To Convey 10-Year Storm Event  Install Overhead Sewers In High Risk Homes  Construct Relief Sanitary Sewer Along Murray To Clair To Crystal To Wilder To Interceptor  Fix Sanitary Sewer Bottleneck @ McClure & Wing Street  Upsize Sanitary Sewer Along Wing Street To Interceptor At State

Rehabilitation Analysis Storm Sewer Outfall Alignment

Rehabilitation Analysis Sanitary Sewer Capacity Analysis – Existing Conditions 1 Yr Storm Event 2 Yr Storm Event 10 Yr Storm Event 25 Yr Storm Event

Rehabilitation Analysis Sanitary Sewer Capacity Analysis – Lateral Lining In Basin No. 2 Only 1 Yr Storm Event 2 Yr Storm Event 10 Yr Storm Event 25 Yr Storm Event

Rehabilitation Analysis Sanitary Sewer Capacity Analysis – Lateral Lining In Basins No. 2 & 3 1 Yr Storm Event 2 Yr Storm Event 10 Yr Storm Event 25 Yr Storm Event

Rehabilitation Analysis Sanitary Sewer Capacity Analysis – Lateral Lining & Storm Sewer Outfall 1 Yr Storm Event 2 Yr Storm Event 10 Yr Storm Event 25 Yr Storm Event

Rehabilitation Analysis Existing Conditions

Rehabilitation Analysis With Lateral Lining & Manhole Rehab.

Rehabilitation Analysis With Lateral Lining, Manhole Rehab. & Add. Storm Sewer Outlet

Financial Review & Summary Recommended I&I Reduction Investment Needed In Study Area:  Private Defect Remediation Resident  Storm Sewer Cross Conn. Remed. City Crews  Overhead Sewer Installation (W/N 3 Feet) $416,000  Manhole Lining Within Basins No. 2 & 3 $53,000  Hamilton Sanitary Sewer Lining $15,000  Basin No. 2 Service T-Liners $640,000  Basin No. 3 Service T-Liners $565,000  North Storm Sewer Additional Outlet $1,466,000 Total: $3,155,000 +

Financial Review & Summary Funding Review:  Sanitary Sewer Mainline & Manhole Rehabilitation Is Cost Of Maintaining System  Per City Code, Residents Own Sanitary Sewer Service To Mainline; Therefore T-Liner Should Be Resident’s Cost  City of Elgin Overhead Sewer Reimbursement Program  Storm Sewer Installation Funding To Be Evaluated

Q&A