Building Johnson County Government’s Largest Project – Tomahawk Creek Wastewater Treatment Facility
Why Wastewater Treatment 2
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
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
Blue River Basin Kansas Missouri
Drivers for Upgrade • Age of equipment • New regulations for water quality • Increasing operational costs
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
Missouri River Load Reductions Relative to Existing Condition Baseline 9
Financial Evaluation of Options No Flow Some Flow All flow
Operating Cost Comparison Reduced Costs: $453 Million
Goals for Long-Term Investment • Preserve high quality of life • Improve water quality • Provide the most cost- effective long-term solutions for customers
Existing Tomahawk Creek WWTF
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
Dual Purpose Compressible Media Filters
Tomahawk Creek Proposed Delivery Methods
Why CMAR for this Project • Collaboration between All parties • Signiant Pre-design already completed • High risk, complicated project • Earlier cost certainty • Optimize design
Tomahawk Creek Proposed CMAR Schedule
Value Engineering led to Design Evolution
Evolution of the Site April 2017 July 2017
Facility Protection Without Flood Rise
Bedrock is at Different Elevations at Site Rock Fill Only Piers Only Piers with Rock Fill
Power Limitations were Addressed
BIM / VR Tools were Utilized for Project
Bluebeam was Used to Review Documents
VE Analysis Continues during Construction
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)
Plant Flow Diagram
Startup Process Overview
BNR Basin & Basin Blower Building
Filter Disinfection Complex
Solids Processing Building
Administration Building
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
Project Successes MOPO: Collection System Diversion Evergy Substation Energized
Facility Startup Coordination Meetings w/ Key • Personnel Energization & LOTO Plan • System Startup Plans • • Key Construction Milestones
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
For Updates: www.jcwtomahawk.com
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