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Cleveland Public Library Photograph Collection

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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
NEORSD
  • 62 Member Communities
  • 1 Million People
  • 370 Square Miles
  • Ave. Daily Flow – 310 Million Gallons
  • Combined Sewers - 35%
  • Separate Sanitary Sewers - 65%
five major interceptor systems
Five Major Interceptor Systems
  • Northwest Interceptor
  • Cuyahoga Valley Interceptor
  • Southwest Interceptor
  • Heights/Hilltop Interceptor
  • Mill Creek Tunnel
service area map
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

mill creek tunnel overview
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
impacts of the mill creek watershed program
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
slide11
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
slide12
Key Construction Issues
  • Blasting
  • Work Hours
  • Spoil Handling & Disposal
slide13
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

slide14
Key Construction Issue

Blasting

Placement of Charges

Results at Surface

Perception

slide15
Key Construction Issue

Blasting

Reality

slide16
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
slide17
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

slide18
Key Construction Issue

Spoil Handling & Disposal

  • Volume of excavated material from MCT-2 70 feet high.
slide19
Key Construction Issue

Spoil Handling & Disposal

public participation
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
easterly facilities plan
Easterly Facilities Plan
  • 88,300 of 18’-24’ tunnels
  • 27 shafts
  • 160 MGD pump station
  • Total estimated projected cost - $1.3 billion
impacts of proposed easterly projects
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
funding
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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