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

All flow

Some Flow

No Flow

Financial Evaluation of Options

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

Expectations