government’s largest project · •project definition phase 2014-2015 •design and gmp...
TRANSCRIPT
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Building Johnson County
Government’s Largest Project –
Tomahawk Creek Wastewater
Treatment Facility
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Why Wastewater Treatment
2
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About JCW
• Located in northeast Kansas
• Established in 1945
• Enterprise funded
• 220 employees
• 6 WWTFs
• 32 pump stations
• 2,200 miles of sewer
• 500,000+ residents served
• 60 million gallons treated each day
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About Tomahawk Creek WWTF
• Leawood. Mission Rd and Lee Blvd
• Established in 1955
• Trickling Filter Facility
• 1980s Linking Interceptor
• 7 mgd onsite/10 mgd to KCMO
• 150,000 – 190,000 residents
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Blue River Basin
Kansas Missouri
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Drivers for Upgrade
• Age of equipment
• New regulations for
water quality
• Increasing operational costs
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Planning Process
• Previous Studies 2006 and 2013
– Evaluated 8 Alternatives
– Evaluated 0 MGD, 10 MGD, and 19 MGD
– Recommend 19 MGD Option
• Project Definition Phase 2014-2015
• Design and GMP Development 2017 – 2018
• Construction 2018 - current
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Missouri River Load Reductions Relative to
Existing Condition Baseline
9
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All flow
Some Flow
No Flow
Financial Evaluation of Options
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Operating Cost Comparison
Reduced Costs:
$453 Million
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Goals for Long-Term Investment
• Preserve high quality of life
• Improve water quality
• Provide the most cost-
effective long-term
solutions for customers
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Existing Tomahawk Creek WWTF
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Preliminary Design Concept• Reuse Influent Pumping
Station and Digester Complex
• IFAS BNR Basins & Blower Building
• Separate Sludge Processing
• Dual Purpose Compressible Media Filters
• Disinfection and Reaeration Facilities
• Concrete Lined Excess Flow Holding Lagoon
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Dual Purpose Compressible Media Filters
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Tomahawk Creek Proposed Delivery Methods
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Why CMAR for this Project
• Collaboration between All
parties
• Signiant Pre-design already
completed
• High risk, complicated project
• Earlier cost certainty
• Optimize design
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Tomahawk Creek Proposed CMAR Schedule
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Value Engineering led to Design Evolution
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Evolution of the Site
April 2017 July 2017
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Facility Protection Without Flood Rise
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Bedrock is at Different Elevations at Site
Rock Fill Only
Piers Only
Piers with Rock Fill
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Power Limitations were Addressed
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BIM / VR Tools were Utilized for Project
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Bluebeam was Used to Review Documents
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VE Analysis Continues during Construction
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Construction Statistics
• 250,000 CY of Earth to Move
• 53,000 CY of Structural Concrete
• 3 Miles of Electrical Ductbank
• 110,000 LF of Pipe (Above & Below Grade)
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Plant Flow Diagram
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Startup Process Overview
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BNR Basin & Basin Blower Building
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Filter Disinfection Complex
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Solids Processing Building
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Administration Building
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Construction Challenges
• 2018 & 2019 - Wettest Water Calendar Year in Kansas (57.88 inches)
• Adjusting to COVID-19 Procedures
• Tight Construction Footprint
• Unforeseen Rubbish During Excavations
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Project Successes
MOPO: Collection System Diversion Evergy Substation Energized
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Facility Startup
• Coordination Meetings w/ Key
Personnel
• Energization & LOTO Plan
• System Startup Plans
• Key Construction Milestones
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Lessons Learned
• Know your site and existing facilities
• Exploratory digging
• SCADA Screen Development
– Big project – a lot to take on at once
• Engage CMAR early
• Communication, Trust, Teamwork
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For Updates: www.jcwtomahawk.com
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Expectations