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Cleveland Public Library Photograph Collection. NEORSD. 62 Member Communities 1 Million People 370 Square Miles Ave. Daily Flow – 310 Million Gallons Combined Sewers - 35% Separate Sanitary Sewers - 65%. Sewer Overflow. Five Major Interceptor Systems. Northwest Interceptor

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Neorsd l.jpg
NEORSD

  • 62 Member Communities

  • 1 Million People

  • 370 Square Miles

  • Ave. Daily Flow – 310 Million Gallons

  • Combined Sewers - 35%

  • Separate Sanitary Sewers - 65%



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Five Major Interceptor Systems

  • Northwest Interceptor

  • Cuyahoga Valley Interceptor

  • Southwest Interceptor

  • Heights/Hilltop Interceptor

  • Mill Creek Tunnel


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SYSTEM

CAPITAL COST

NORTHWEST

INTERCEPTOR

$25 MILLION

SERVICE AREA MAP

CUYAHOGA

VALLEY

INTERCEPTOR

$75 MILLION

SOUTHWEST

INTERCEPTOR

$210 MILLION

$260 MILLION

HEIGHTS/HILLTOP

INTERCEPTOR

MILL CREEK TUNNEL

$150 MILLION


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Mill Creek Tunnel Overview

  • Recommended in 1997 Facilities Plan

  • To be built under three contracts, MCT-1, 2, and 3

  • 43,000 feet; 20 ft. Diameter; Depths up to 300 ft.

  • Estimated Construction Cost = $150 Million


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Impacts of the Mill Creek Watershed Program

  • Provide over 70 million gallons of storage in new tunnel

  • Eliminate 13 overflows entirely (27 now exist)

  • Reduce annual overflow from over 500 million gallons to 14 million gallons

  • No remaining overflows should activate more than an average of 5 times per year



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TBM

Tunnel Boring Machine

  • Diameter – 23’ 8”

  • Length – 60’ / 200’ with trailing Gear

  • Weight – 700 tons

  • Production – 55’ / day / 8’ per hour

  • Spoils – 17 cubic ft. per linear foot

  • Cost - $10-15 million


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Key Construction Issues

  • Blasting

  • Work Hours

  • Spoil Handling & Disposal


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Key Construction Issue

  • Peak particle velocity held to less than 0.5 in/sec at nearest structures

  • Air-overburden Pressure Shall not Exceed 133 Decibels

  • Pre-Blast Survey

Blasting


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Key Construction Issue

Blasting

Placement of Charges

Results at Surface

Perception


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Key Construction Issue

Blasting

Reality


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Key Construction Issue

Work Hours

  • Key concern to prospective bidders

  • Affects ability to construct shafts, mine tunnel, and remove spoils

  • One shift operation will add 1+ years and $5 million to the project


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Key Construction Issue

  • Who owns the tunnel spoils?

  • 24’ diameter TBM produces 1400 cu.ft. of spoil material during 2/8 hour shifts.

    • 140 trucks per day

    • 12 trucks per hour

    • 1 truck every 5 minutes

Spoil Handling & Disposal


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Key Construction Issue

Spoil Handling & Disposal

  • Volume of excavated material from MCT-2 70 feet high.


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Key Construction Issue

Spoil Handling & Disposal


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Public Participation

  • Inform local officials of the project during the design process

  • Keep local officials informed during design & discuss issues that impact the local community

  • Convene public meetings prior to the commencement of construction





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Easterly Facilities Plan

  • 88,300 of 18’-24’ tunnels

  • 27 shafts

  • 160 MGD pump station

  • Total estimated projected cost - $1.3 billion



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Impacts of Proposed Easterly Projects

  • Provide 152 million gallons of storage in new tunnel

  • Eliminate 78 high-maintenance regulators reducing the potential for dry weather discharges

  • Reduce annual overflow from 2,560 million gallons to about 450 million gallons

  • No remaining overflows should activate more than an average of 4 times per year


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Funding

  • Water Pollution Control Loan Fund (WPCLF)

  • Administered by Ohio EPA

  • Low Interest Loan Program

  • Standard Construction Loan – 20 year based on 1.25% discount below the current GO bond – currently 3.78%

  • NEORSD has received 33 loans representing $387 million

  • WPCLF has financed 53% of District jobs since 1991



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