OBG and the City of Ithaca PRESENTS:

Ithaca Commissions New Membrane Filtration Plant

Matthew Sledjeski, P.E. & Richard Gell, P.E.

AGENDAWhy Rebuild?

Procurement Strategy

Construction Phasing Considerations

The Constructed Facilities

Performance Benefits Achieved

Anticipate Change

Lessons Learned

Acknowledgements

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Why Rebuild the Existing Water Treatment Plant?

Rebuild Benefits

Preserves the reliability of

three sources

Avoided energy use of over 1,300,000

KwH/yr.

Avoided risky pipeline

construction along NYS Highway

Preserves control of water

supply

Why rebuild on the same site?

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Community perception that the natural area created as a result of the water supply was sacred ground

100 years of development left no other practical option

Overall Plant Procurement Strategy

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City retains OBG as program manager

Side by side piloting of membrane vendors

Plant designed based on piloted vendors

Pall Corp awarded bid for membranes

Adaptive changes made to design and Construction contracts issued

1. Complete system reliability upgrades

2. Construct pretreatment processes

3. Construct Upper membrane room

4. Construct balance of plant

Overall Construction Phasing

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Step 1

Step 2Step 3

Step 4

System Reliability Upgrades

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Construct residuals handling facility

Restore 1.5 MG of operational storage Interconnection with Bolton Point system

Project Elements That Minimized Reliance on Plant Production

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Water quality benefits

Reliability benefits

Restored use of an idle asset

New pump station increased usable storage by 1.5 MG

Repair of identified leaks reduced demand by 1.5 MGD

Mechanical sludge dewatering facility eliminated scheduling constraints for settling basin cleaning

Existing Tank

New Pump Station

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New Residuals Handing Facility

New residual handling with volute press eliminated manual lagoon cleaning.

Plant Construction Phasing

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After the off-site facilities was constructed, the plant was completed in three basic phases:

Phase 1 included demo of the original settling basin and constructing new pre-treatment facilities and electrical room

Phase 2 included construction of the Upper membrane filtration system and temporary CIP system

Phase 3 included the balance of plant demolition and re-construction

Buried Sed. Basins Replaced With Plate Settlers and Automated Sludge Collection

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City Selected Rebuild Option Over Renovation

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“A rebuild will be like trying to fix dinner while you’re remodeling the kitchen.”

William Gray, retired Superintendent of Public Works,

Media Filters Replaced With Pall Membrane Microfilters

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Circular charts replaced with master control system

Operators can monitor and control the plant, distribution system, and building systems from one central location

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New Chemical Storage and Feed Systems

▪ Sodium permanganate at intake

▪ Chlorine dioxide at plant raw water

▪ Polyaluminum chloride

▪ Phosphate corrosion inhibitor

▪ Sodium hypochlorite

▪ Sodium hydroxide for pH control

▪ Membrane CIP

Separation of chemicals and flow pacing enhance operations and safety

ELAP certified lab with dedicated space for process control testing

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Wet chemistry, ELAP certified microbiological testing, USGS watershed monitoring

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Other Plant Features

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Operational Benefits achieved

System automation provides tools for improved process control

Automated sludge collection eliminated manual cleaning

Membrane filters eliminated manual filter backwashes

Eliminated vulnerability from antiquated facility

Performance Benefits Achieved

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2011 2017

Settled water turbidity

<5 <1

Filtered water turbidity

0.1 0.02

Raw water flow

4.0 2.4

Finishedwater flow

2.5 2.2

Project was completed within budget!

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Original Contract Final

Water System Improvements $1,950,000 $1,929,207

Residuals Handling $4,482,000 $4,462,917

Membrane Equipment $3,122,969 $3,122,969

Water Treatment Plant $17,577,209 $17,853,647

Clearwell Replacement Not Included $1,100,458

Control System Integration $500,000 $685,000

Engineering $4,250,000 $4,785,000

Other Project Costs Not Included $1,060,202

Contingency $4,487,822 Not Included

Total Project Cost $36,370,000 $34,999,400

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Self graded LEED score of 45 points

Existing materials crushed and used on site

High Efficiency Building Envelope & Energy Management

Provisions for P.V. and Hydro-electric

Compliance with Design and Construction Principles LEED Building

Anticipate Construction Challenges and Unforeseen Conditions

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Temporary cross-ties in sed. basin

Variable soil conditions

Inoperable valves

Wood piling left in place

Pretreatment key to membrane performance

Expect Project delays

Beware of manganese interference with DPD tests

Lessons Learned

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“I feel like we now have the tools to make great water.”

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Nate Carman, Operator

AcknowledgementsCity of Ithaca Staff

Watek Engineering

Pall Corporation

Welliver McGuire, Inc.

Schuler- Haas Electric Corp.

Kimble, Inc.

Ackerman Plumbing, Inc.

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QUESTIONS

OBG and the City of Ithaca PRESENTS:OBG | THERE’S A WAY

Thank you!Rick.Gell@obg.com