1 / 28

Cleveland Public Library Photograph Collection

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

dorit
Download Presentation

Cleveland Public Library Photograph Collection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Cleveland Public Library Photograph Collection

  2. NEORSD • 62 Member Communities • 1 Million People • 370 Square Miles • Ave. Daily Flow – 310 Million Gallons • Combined Sewers - 35% • Separate Sanitary Sewers - 65%

  3. Sewer Overflow

  4. Five Major Interceptor Systems • Northwest Interceptor • Cuyahoga Valley Interceptor • Southwest Interceptor • Heights/Hilltop Interceptor • Mill Creek Tunnel

  5. 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

  6. 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

  7. 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

  8. Large Tunnel Construction

  9. 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

  10. Key Construction Issues • Blasting • Work Hours • Spoil Handling & Disposal

  11. 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

  12. Key Construction Issue Blasting Placement of Charges Results at Surface Perception

  13. Key Construction Issue Blasting Reality

  14. 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

  15. 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

  16. Key Construction Issue Spoil Handling & Disposal • Volume of excavated material from MCT-2 70 feet high.

  17. Key Construction Issue Spoil Handling & Disposal

  18. 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

  19. CSO Reduction to Present

  20. Recommended Control Plans

  21. CSO Reduction by 2019

  22. Easterly Facilities Plan • 88,300 of 18’-24’ tunnels • 27 shafts • 160 MGD pump station • Total estimated projected cost - $1.3 billion

  23. Easterly CSO Storage Tunnel

  24. 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

  25. 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

  26. a gift of clean water

More Related