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

▶

Jan 11, 2024 22 likes •333 views

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,

SLIDE 1

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

SLIDE 2

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

SLIDE 3

Background Information

Study Area

SLIDE 4

Study Area Overview

N. Commonwealth

& Murray Reference Point

SLIDE 5

Study Area Overview

SLIDE 6

Study Area Overview

SLIDE 7

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

SLIDE 8

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

SLIDE 9

Study Initiation

SLIDE 10

Study Initiation

SLIDE 11

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)

SLIDE 12

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)

SLIDE 13

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

SLIDE 14

SSES Fieldwork

Boring Locations

Estimated Drummer Soil Limits

SLIDE 15

SSES Fieldwork

Boring Logs

SLIDE 16

SSES Fieldwork

SLIDE 17

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

SLIDE 18

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

SLIDE 19

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

SLIDE 20

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

SLIDE 21

Rehabilitation Analysis

Storm Sewer Outfall Alignment

SLIDE 22

Rehabilitation Analysis

Sanitary Sewer Capacity Analysis – Existing Conditions

1 Yr Storm Event 2 Yr Storm Event 10 Yr Storm Event 25 Yr Storm Event

SLIDE 23

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

SLIDE 24

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

SLIDE 25

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

SLIDE 26

Rehabilitation Analysis

Existing Conditions

SLIDE 27

Rehabilitation Analysis

With Lateral Lining & Manhole Rehab.

SLIDE 28

Rehabilitation Analysis

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

SLIDE 29

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 +

SLIDE 30

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

SLIDE 31