Sanitary Sewer #200 Area Flow Equalization Review of Project Design - - PowerPoint PPT Presentation

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Sanitary Sewer #200 Area Flow Equalization Review of Project Design - - PowerPoint PPT Presentation

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Sanitary Sewer #200 Area Flow Equalization Review of Project Design Criteria and Storage Options City of Northwood Planning Commission Preliminary Site Plan Review Meeting December 8, 2014 1 Project History City of Oregon

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Sanitary Sewer #200 Area Flow Equalization

Review of Project Design Criteria and Storage Options City of Northwood Planning Commission – Preliminary Site Plan Review Meeting – December 8, 2014

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Project History

City of Oregon Agreement with Ohio EPA

Requires Various Improvements to Oregon System

District Flows limited to 5 mgd

District / City of Oregon Agreement

Renewed April 2014

Flow Rate Limitation Maintained at 5 mgd

New Requirements

Flow Control Equipment

Permanent Flow Metering

2 Million Gallons of Storage

18 months to Complete Improvements (October 2015)

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Facility Planning Report (J&H)

Existing Conditions

5 mgd rate exceeded 60+ times in 18 months*

Recommendations

I/I Removal & Reduction

Flow Equalization Storage

*Study Period from 1/2011 to 6/2012

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Inflow and Infiltration (I/I) Reduction

Repairs to the existing sewer system.

District is committed to reducing I/I in the long term.

I/I Reduction is not feasible in the short term.

Costly – Estimated at over $20 million dollars.

Time Consuming – I/I reduction schedule in years, not months.

Results Uncertain – sealing leaks in one area often moves leak to another.

Definitions:

Inflow - Surface runoff directly entering Sanitary Sewer through illegally connected piping.

Infiltration – Groundwater water entering pipe and manhole defects.

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Why is Flow Equalization Storage Needed?

To reduce wastewater pollution draining into Lake Erie.

Wastewater from SS-200 Area goes to City of Oregon for Treatment.

Average daily flow of 1 mgd.

District is contract limited to 5 mgd into City of Oregon.

Wet weather flow often exceeds 5 mgd.

SS-200 contributes to Oregon’s overflows.

City of Oregon has direct overflows into Lake Erie during extended wet weather.

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How was Flow Equalization Site Selected?

Near 48-inch Trunk Sewer

Reduce Piping Costs

Reduce Pumping Costs

At downstream location on Trunk Sewer

Optimize Operation – Basin requires sewer to surcharge to fill.

Upstream of City of Oregon

Existing Flow Control Structure

  • n Curtice Road

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SS-200 Sanitary Sewer Service Area City of Oregon Treatment

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How was Flow Equalization Site Selected?

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Enlarged Vicinity Map

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How was Flow Equalization Site Selected?

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Profile of 48” Trunk Sewer

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Flow Equalization Storage Options

Above Grade Storage Basin

Below Grade Storage

Buried Pipeline

Buried Structure

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2.5 MG Basin – Terra Haute, IN

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Below Grade Storage Pipeline

Passive Operation – Fill / Drain by Gravity.

Buried – No Above Grade Structure.

Selected Alternative from Facility Planning Report.

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Below Grade Storage Pipeline Preliminary Design

Route Selected

Considerations

High Tension Electric

Wetlands

Construction Methods

Preliminary Costs for the Storage Pipeline

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Above Grade Storage

2.0 MG Prestressed Concrete Tank

Pump Station for Filling

Gravity Drain to 48” SS-200 Trunk Sewer

Architectural Finish

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2.1 MG Basin Butler County, OH

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Above Grade Storage Basin

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Economic / Financial Comparison

Option 2 MG Storage Pipeline 2 MG Above Grade Basin Cost Savings Estimated Initial Project Cost $7,800,000 $5,100,000 $2,700,000 Estimated Annual O&M Cost* $37,400 $92,100 $(54,700) Estimated Annual Debt Service on Initial Project Cost (20 yrs at 3.1% APR – Ohio EPA DEFA Loan) $530,000 $340,000 $190,000 Estimated Total Annual Cost $567,400 $432,100 $135,300

*Includes Equipment Replacement Costs.

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Operation & Maintenance Comparison

Option / Criteria 2 MG Storage Pipeline 2 MG Above Grade Basin Land / Site Permanent Utility Easement Lands Purchased by District Operation Fill & Draw by Gravity Pumping to Fill Access Below Grade Above Grade Cleaning Outside Contractor Flushing Equipment & District Equipment Hydraulic Level and Flow Control Devices Pump Station & Telemetry (10MGD Capacity) Electric Power Minimal New 3 Phase Power for Pumps Backup Power None Required Required for Pumps Risk from Equipment Failure Basement Flooding Due to Reduction in Sewer Freeboard Minimal, excess flows to Oregon District Pays Flow Surcharge Site Maintenance Minimal Mowing / Landscaping Building Maint. Semi-annual Internal Inspection Annual Inspection Outside Utilities Coordination Toledo Edison & Sunoco Pipelines City of Northwood, Toledo Edison & Sunoco Pipelines Insurance Buried Pipe Above Grade Structure

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Construction Schedule Comparison

Task 2 MG Storage Pipeline* 2 MG Above Grade Basin NWSD / City Contract Effective Date April 2014 Final Design Complete October 2014 December 2014 Bidding May 2014 March 2014 Construction Commencement July 2015 June 2015 Construction Complete August 2016 January 2016 Contract Deadline for District Construction of Storage Improvements October 2015

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All dates estimated as normal construction projects. Accelerated design and construction schedules may be possible at a cost premium. *The presented construction schedule based upon favorable pipe procurement.

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Proposed View of Basin from Wise Street

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Enlarged View of Proposed Basin from Wise Street

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