ChallengeThe aging infrastructure at the Lakota Wastewater Treatment

Plant was in critical need of upgrade. Due to the inefficient,

outdated systems, the plant required twice the horsepower in

aeration equipment and was reliant upon chemical-aided

treatment in order to comply with National Pollutant

Discharge Elimination System permit limits. Lakehaven Utility

District sought to upgrade its Lakota plant to improve

efficiency, reduce energy consumption and mitigate the risk

of a potential plant failure.

SolutionFinancing and managing critical upgrades

Trane proposed that Lakehaven Utility District consider using

the State of Washington Design/Build Energy Savings

Performance Contracting Program (ESPC), authorized under

state law and managed by the Washington State Department

of Enterprise Services, as an option to help finance its needed

upgrades. The district reviewed the proposal and, based on

Trane’s leading performance in the wastewater treatment

plant industry and positive references, selected Trane as its

ESPC partner to manage the entire upgrade process.

Lakota Wastewater Treatment PlantPerformance contracting upgrades result in $850,000 energy andoperational savings • Federal Way, Washington

The Lakota Wastewater Treatment Plant, located on twenty-three acres, is Lakehaven Utility District’s largesttreatment plant. The district encompasses an area of approximately thirty-five square miles with a service populationof approximately 112,000 people. Seventy-five percent of the service is currently to single-family residential dwellings,but in the past it has been up to 50 percent from commercial businesses and restaurants. The Lakota plant is fed byabout 150 miles of collection system piping and thirteen lift stations.

Performance contracting is a funding option that provides

measurable organizational results to support strategic

objectives. It allowed Lakota Wastewater Treatment Plant to

use future energy and operational savings to finance

infrastructure improvements upfront. Working with Trane, the

performance contract enabled the Lakehaven Utility District

to secure a third party muni-loan at an attractive rate,

allowing them to allocate their limited capital to other areas.

The Lakota Wastewater Treatment Plant used the State of Washington

Design/Build Energy Savings Performance Contracting Program to

secure financing for needed upgrades.

October 2014Case study

Optimizing resources, maintaining project ownership

By using Trane, one of a small group of firms prequalified by

the State of Washington as a preferred energy services

company (ESCO), Lakehaven Utility District saved the time

and resources required to bid out the project. The partnership

with Trane allowed the Lakehaven Utility District to make the

best use of its limited staff, while utilizing Trane’s expertise.

The partnership also enabled the district to maintain

ownership of the project, selecting the equipment that they

preferred and choosing the contractors and consultants that

best fit their needs, with a Trane performance contract

guaranteeing the cost and performance.

Reducing costs, mitigating risks

Upgrades at the Lakota Wastewater Treatment Plant included

a complete replacement and optimization of its secondary

treatment aeration system. The treatment process

evaluation/optimization maximizes energy and operational

savings, while ensuring Department of Ecology code

compliance and risk mitigation. The upgrades improve current

process instability issues, lower operational and maintenance

costs, reduce power consumption, and offset capital repairs.

The improvements also allow for future biological nutrient

removal air demand to be met for future nitrogen control.

ResultsOriginally seeking to upgrade the outdated equipment and

infrastructure at the Lakota Wastewater Treatment over

several years, through the Energy Savings Performance

Contracting Program, the Lakehaven Utility District was able

to fund the complete replacement and optimization of its

secondary treatment system aeration at one time with the

guidance of Trane and assistance through the ESPC. The

upgrades have greatly reduced the treatment plant’s risk of

failure and compliance violations.

The plant upgrade has achieved $850,000 in energy and

operational savings for the Lakehaven Utility District. The

project, which included a 30 percent reduction in chemical

costs, along with a one-time revenue grant of $602,000,

delivered a positive cash flow return to the district in less than

one year.

“We’re pleased that we were able to fund critical

improvements through energy and operational savings," said

Chris McCalib, wastewater operational manager for

Lakehaven Utility District. “We’re also pleased that we could

complete the project in less than a year, and delighted that

we can realize a return on our investment early on.”

Upgrades at the Lakota Wastewater Treatment Plant, which included the

replacement and optimization of its secondary treatment aeration

system, delivered a positive cash flow return in less than a year.

Ingersoll Rand (NYSE:IR) advances the quality of life by creating comfortable, sustainable and efficient environments. Our people and our family of brands—including Club Car®, Ingersoll Rand®, Thermo King® and Trane®—work together to enhance the quality and comfort of air in homes and buildings; transport and protect food and perishables; and increase industrial productivity and efficiency. We are a global business committed to a world of sustainable progress and enduring results.

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We are committed to using environmentally conscious print practices. ©2014 Ingersoll Rand CASE-SLX384-EN October 01, 2014