Presented by NEORSD Richard J. Switalski, P.E. Presented by NEORSD Richard J. Switalski, P.E.

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

Primary Goals Alleviate separate sanitary sewer overflows Reduce flows to the combined sewer Reduce basement and street flooding events Alleviate separate sanitary sewer overflows Reduce flows to the combined sewer Reduce basement and street flooding events

Sewer Overflow

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

SOUTHWEST INTERCEPTOR CUYAHOGA VALLEY INTERCEPTOR SERVICE AREA MAP HEIGHTS/HILLTOP INTERCEPTOR MILL CREEK TUNNEL NORTHWEST INTERCEPTOR SYSTEMCAPITAL COST $25 MILLION $75 MILLION $210 MILLION $260 MILLIO N $150 MILLION

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 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 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 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

Large Tunnel Construction

TBM 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 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 Tunnel Boring Machine

Blasting Work Hours Spoil Handling & Disposal Blasting Work Hours Spoil Handling & Disposal Key Construction Issues

Blasting 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 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

Perception Placement of Charges Results at Surface Key Construction Issue Blasting

Reality Key Construction Issue

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 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 Work Hours Key Construction Issue

Spoil Handling & Disposal 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 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 Key Construction Issue

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

Spoil Handling & Disposal Key Construction Issue

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 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

CSO Reduction to Present

Recommended Control Plans

CSO Reduction by 2019

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

Easterly CSO Storage Tunnel

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 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 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 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

a gift of clean water