Carollo Engineers is an environmental engineering firm specializing in the planning, design, and construction of water and wastewater facilities. Our reputation is based upon client service and a continual commitment to quality. Carollo has undertaken a strategic sustainability initiative in order to:

Establish a vision to guide us toward a more sustainable future, and•

Align and engage our employees to work toward achieving that •vision.

Sustainability is about meeting human needs within the limits of nature. It is about employing technologies that ‘fit’ into nature’s ecosystems, which provide the services and resources upon which all life depends.

The Bad News - Currently, a great deal of human activity is unintentionally jeopardizing the health and stability of ecosystems, people, and societies. The scale of our economy has surpassed nature’s limits to both provide resources and absorb wastes. Resource depletion, toxicity, climate change, pollution, poverty - all these issues are evidence that we must change the way we use energy, water, and materials if we want a planet that supports future generations.

The Good News - Organizations everywhere are creating value by putting more sustainable solutions into practice... and they are saving money, improving environmental performance, sparking innovation, and cultivating loyalty by unleashing passionate, creative energy in their employees.

“Sustainable human communities meet their current needs without compromising

other species and future generations.”

- International Council for Local Environmental Initiatives

HUMANITY’S ECOLOGICAL FOOTPRINT, 1961-2005

World biocapacity

19600

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

1970

Num

ber o

f pla

net E

arth

s

1980 1990 2000 05

Carollo SUSTAINABILITY PLAN 2009 Annual Report

I am proud to share our first annual Sustainability Report. We have chosen the spiral - the shape of growth in nature - to symbolize our efforts. As we listen to and work with our clients, our determination and goals continue to grow and evolve, but our vision - to improve the world’s water - remains the same. Water is the unifying fluid of life. Clean water supports healthy

people, ecosystems, and economies. The water sector, in which we all work, directly supports a sustainable future.

We devoted a significant amount of research and creative, collaborative energy to develop and implement our sustain-ability plan. We began by mapping Carollo’s impacts and areas of influence. Cross-linking this information with the science-based Natural Step Framework1, teams of employees then developed a unified vision for our company as expressed in our 2025 Sustainability Objectives. We then set shorter-term goals and identified ‘quick wins’ to start us on the path. Summarized herein, this concentrated planning effort provides the framework for the many actions that will realize this vision in the coming years.

Aggressive pursuit of sustainability goals will make Carollo a stronger company by better meeting the needs of our clients; strengthening our ability to attract and retain smart, talented employees; improving the bottom line through more efficient use of resources; and by enhancing

the services we offer clients. Moreover, it is the right thing to do.

I invite you to join us in building the future we all want to live in.

Gary C. Deis Chief Executive Officer

The Ecological Footprint is a sustainability metric that

measures how much nature we use compared to how much

nature there is.

Ecological overshoot describes a problem where resources

are used faster than they can regenerate, and wastes,

such as CO2 emissions, are created faster than they can be

absorbed. In 2005, humanity used 31% more resources than

nature could regenerate; the rate of overshoot is expected

to increase over time.

– The World Wildlife Fund “Living Planet Report

2008” and www.footprintnetwork.org

Carollo has embarked on a journey toward sustainability because:

Our clients expect it. •

Our employees want it.•

It improves our bottom •line.

It’s the right thing to do.•

The path to sustainability begins with how we make decisions. Carollo is expanding its decision-making framework to consider a more comprehensive range of social, environmental, and economic impacts over longer timeframes.

LIFEWATER

PR

OS

PE

RIT

Y

CREATES

IMPACTS IMPACTS

FUELS

Fresh water is the substance

of life and the world’s most

vital resource. Perhaps more

than anything else, water

connects us with the world

around us.

1The Natural Step Framework is used by thousands of organizations around the world to guide sustainability efforts. Visit www.naturalstep.org for more info.

The journey begins . . .

1 2

Appraise

Engage

Align

Evolve

SUSTAINABILITY is not new to Carollo1990s – Several offices began recycling.•

1993 – 1st Waste Reduction Award received from the California •Integrated Waste Management Board; we have earned this award for fifteen years.

2001 – Sustainability Coordinator position created.•

2001 – Facilities staff began specifying more sustainable flooring, •paint, furniture, and appliances for office remodels.

2003 – First LEED Accredited professional in the firm.•

2003 – Administrative Committee passed an Environmental Policy •that pledged to reduce our ecological footprint by reducing solid waste and energy use, and promoting environmentally friendly practices among our employees, suppliers, and clients.

2004 – Walnut Creek, CA office certified as a Green Business.•

2005 – Validated biomimicry-inspired PAX Water Mixer. •

2006 – Developed greenhouse gas emissions model for use on •client projects.

2007 – Gave several presentations on sustainability at •professional conferences in the U.S. and chaired the Program Committee for the Pacific Northwest Clean Water Association’s first ever Sustainability Conference.

2008 – Carollo Board of Directors passed a companywide •Sustainability Policy.

Carollo’s SuStainability PolicyCarollo Engineers is committed

to demonstrating leadership in:

Protecting and restoring a •

healthy environment.

Promoting fair and equitable •

quality of life for current and

future generations.

Increasing value for our •

clients, shareholders, and

employees.

We will strive to incorporate

environmental, social, and

economic considerations into

decision-making processes for

both client projects and internal

business operations.

We will monitor, measure, and

report on our performance.

Carollo’s Board of Directors adopted

a triple bottom line Sustainability

Policy in January 2008.

Policy 2025 Objectives

Planet - Protect and Restore a Healthy Planet

Be climate neutral

Send zero waste to landfill

Honor local hydrology cycles

Purchase environmentally preferable products

People - Secure Quality of Life for Current and Future Generations

Attract and retain smart, talented professionals

Contribute to long-term workforce sustainability in our industry

Make a positive contribution to the sustainability of communities in which we work

Prosperity - Increase Value for Our Clients, Shareholders and Employees

Deliver sustainable services

Be profitable

Carollo used Interface carpet tiles

in the 2001 remodel of the Walnut

Creek, CA office. Carpet tiles reduce

material use by producing less

waste during installation and

providing the ability to replace

small sections of worn carpet in

future years. The pattern mimics

the flow of a stream.

Photo credit: Lisa Onizuka, cleanwebdesign.com

Our approach is simple:

Align. Align our employees around a shared vision and goals. We seek to tap the power of our employees’ creativity and passion to achieve our goals, rather than focusing on checklists and rules.

Engage. Engage employees as partners in achieving our vision, so it becomes part of the daily lens through which they approach their work. We engage our staff through communications, training, opportunities to get involved, and incentives to apply their ingenuity and expertise in their own areas of influence. We also engage by celebrating and sharing successes and best practices across our offices.

Appraise. We will measure our progress through a comprehensive set of sustainability performance metrics. Some metrics are described in the following pages and others will be developed in the coming year. Accountability for progress resides within our regular management channels - office managers and department heads.

Evolve. Adapt our goals and programs based on appraisal of our progress and other new information. On an annual basis, we will present a formal review of our progress and recommendations for change to our Board of Directors.

The SUSTAINABILITY PlanWe have developed a Sustainability Plan to guide our efforts in becoming a sustainable organization. Our success depends on participation by all of our employees… it is a shift in our culture that we are aiming for, one mind at a time. Our strategic sustainability framework includes a triple bottom line Company Policy and nine 2025 Sustainability Objectives. The Objectives are the vision toward which we are working. Near-term targets developed to help achieve the long-term objectives are described in following pages.

Carollo Strategic SUSTAINABILITY Framework

Our long-term

vision is to weave

sustainability into

the very fabric of

Carollo… so that it

becomes a regular

part of everyone’s

job description

3

Read on to learn more about our first steps toward

meeting our 2025 Sustainability Objectives.

4

PLANETCarollo’s approach to becoming climate neutral is to first reduce our greenhouse gas (GHG) emissions, then evaluate opportunities to purchase renewable energy, and finally, invest in carbon offset projects to balance remaining GHG emissions. We performed a GHG baseline emissions inventory based on EPA’s Climate Leaders GHG Inventory Protocol to measure the impact of our operations. Carollo operations, including business travel and employee commuting, emitted 8,100 metric tons of carbon dioxide equivalents (CO2e) in 2006.

O�ce Energy36%

Employee Commute22%

Business Travel - Air

26%

Business Travel - Car

8%

Waste2% Fleet

6%

Recent AchievementsCarollo offers a commuter tax benefit to encourage the use of mass transit. Several •offices offer additional incentives to use alternative modes of transportation (AMT):

Several offices coordinate participation in Bike to Work Day. –

Phoenix pays trip home for bus/light rail when used to get to work, holds a –monthly prize drawing for AMT employees who enter, and gives $100 gift card to employees who use AMT 26 or more times in a calendar year.

Walnut Creek makes fleet cars available for carpooling between the office –and a mass transit station.

Several offices have on-site shower and bicycle parking facilities. –

Carollo signed its first “green lease” for new office space in Phoenix, AZ. In •2010 employees will move to a location on the new light rail system. In addition to choosing a location that will facilitate employee commutes via mass transit, the new Phoenix lease contains provisions requiring the landlord to employ sustainable practices, including applying for Green Globes certification, implementation of a comprehensive recycling and waste reduction program for the building, and use of green janitorial products.

Carollo has developed green leasing criteria and is •testing it on our Portland, OR office search.

Corporate Real Estate has evaluated current office •space utilization and made a recommendation to the Board to reduce the square foot/seat as offices renew or enter into new lease agreements.

Video-conferencing equipment installed in most offices •is frequently used, reducing business travel and related GHG emissions.

2025 Objective: Be climate neutral

Near-Term Targets By When? Metric1Status

2006/20082

Goal: Reduce greenhouse gas emissions from Carollo operations by 10% over 2006 baseline

Reduce greenhouse gas emissions from Carollo operations by 10% over 2006 baseline

2010 Total CO2e emissions (metric tons/year)

8,100

Commute CO2e emissions/employee (metric tons/year)

2.72

Average roundtrip commute/ employee (miles/day)

292

% single occupancy vehicle/total miles commuted

91.4%2

Reduce office energy use 5% over 2006 baseline

2010 Office energy use/employee (kWh/year)

7,800

Reduce business travel 10% over 2006 baseline

2010 Air travel/employee (miles/year) 18,000

Business car travel3/employee (miles/year)

3,000

Increase ‘green’ office features

Over time, as leases

renew

Number of ENERGY STAR certified offices

3 of 22 offices

Reduce shipping 20% over 2008 baseline

2010 Shipping $/million annual revenue

$2,3002

1. GHG emissions are expressed in metric tons of CO2e emitted. Per employee metrics based on number of full-time equivalent employees. CO2e is the unit of measurement used to compare the relative climate impact of the different greenhouse gases. The CO2e quantity of any greenhouse gas is the amount of carbon dioxide that would produce the equivalent global warming potential.

2. Carollo completed a GHG emissions inventory of operations using 2006 as a baseline; however, an employee commute survey was done in May 2008. Footnoted data is 2008 data; all other data is for 2006.

3. Includes travel by fleet vehicles, rental cars, and personal cars for business use.

2006 Baseline GHG Inventory

Be climate neutral

Strategize and put into place reduction measures for •office energy use, business travel, and shipping

Prepare GHG emissions inventory for 2009•

Define green office metrics and baseline data•

Pass sustainable office leasing policy•

Next Steps

Some employees commute

to the office using their

own “people power” - one

Portlander even kayaks to

work on occasion!

In May 2008, 70% of Carollo

employees responded to an

electronic survey on commute

habits that helped us calculate

our company carbon footprint.

Results were reported to employees

via this flyer that was distributed

electronically.

Carollo added its first hybrid car

to its fleet in 2002. We currently

own 8 hybrids, as well as several

other ultra low emissions vehicles.

The scientific community

has observed an increase

in the concentration

of greenhouse gases,

which is contributing

to increases in average

atmospheric and oceanic

temperatures. Among

a wide range of climate

responses are changes

in habitat, precipitation

patterns, and sea level rise.

Reducing greenhouse gas

emissions from Carollo’s

operations, travel, and the

facilities we plan and design

can help the environment and

mitigate future climate change.

5 6

There is no waste in nature;

all nutrients are continuously

recycled. Achieving zero waste

will help reduce our ecological

footprint by reducing the

quantity of raw materials extracted

from nature and eliminating waste.

It will also reduce costs.

Environmentally preferable

purchasing means buying

items that have lower lifecycle

impacts on human health and

the environment as compared

to competing goods and

services serving the same

purpose. Environmentally

preferable products are long

lasting, high-quality, less toxic,

reusable, easy to recycle, and

use less materials, water and

energy, minimizing harmful

environmental and health

impacts.

Recent AchievementsCarollo recently received its 15th California Waste Reduction Award. This award •recognizes achievements in waste reduction and recycling.

Our Accounting Department is going paperless! We have been steadily making •progress toward going paperless for timekeeping and payroll, accounts payable, client invoicing, monthly reporting, and document storage. Annual savings estimated in 2007 were $97,000, consisting of avoided labor, paper, envelopes, and toner costs... and they now need a mere 4 filing cabinets where they used to need 25.

The Phoenix, AZ office switched from single serving packaged coffee containers •to thermos coffee brewers, reducing the amount of plastic waste generated and saving approximately $19,000 annually.

Revised our procedures to modify specifications to facilitate paperless editing. •Estimated annual paper savings of 945 reams are dwarfed by the estimated

savings in labor.

Walnut Creek, CA (WCO) office has dedicated one printer to reuse •paper (i.e., paper already printed on one side).

Perform waste audit to develop baseline data for metrics•

Increase the use of paperless construction document •review processes

Modify Carollo standard document templates to optimize •paper use

Configure all computers to default to duplex printing•

Offer Carollo publications electronically as well as via paper•

Next Steps

Recent AchievementsCarollo has practiced EPP in select areas for years, purchasing •Energy Star compliant equipment, fuel-efficient vehicles, recycled paper, and ‘green’ materials for office buildouts.

Carollo’s office improvement projects incorporate •sustainable materials, including low/no VOC paints and adhesives; recycled-content carpet; naturally-based products such as rubber wall base, straw/wheatboard panels and linoleum flooring; Energy Star appliances; and Steelcase Leap chairs, a Cradle-to-Cradle certified product.

In 2009 Carollo standardized on a minimum of 30 percent •post-consumer recycled content for copier paper.

We are transitioning to more sustainable conference •giveaways (e.g., notebooks made from recycled paper, reusable water bottles, music downloads).

Print all publications and proposals on 100% •recycled, 50% post-consumer waste paper

Conduct a companywide purchasing audit to •identify additional opportunities

Next Steps

2025 Objective: Purchase environmentally preferable productsNear-Term Targets By When? Metric Status 2008

Use a minimum of 30% post consumer recycled content paper in all copiers

2009 % of 30% recycled content paper purchases/total paper purchases

60%

Use a minimum of 50% post consumer recycled content paper in all copiers

2011 % of 50% recycled content paper purchases/total paper purchases

0%

Improve mpg of fleet As vehicles are

replaced

Average mpg of Carollo fleet 21.3

% of (S)ULEVs1/total number of vehicles in fleet

8.3% (2006)

Use green janitorial products 2011 Number of offices using green janitorial products

1 of 28 offices

1. Ultra Low Emission and Super Ultra Low Emission Vehicle.

2025 Objective: Zero waste to landfillNear-Term Targets By When? Metric Status 2008

Reduce waste to landfill by 10% and increase recycling rate by 25% over 2008 baseline

2010 Materials to landfill (tons/year) N/A1

Materials recycled (tons/year) 59,000

Number of offices that recycle 18 of 28 offices

Reduce paper use per person by 25% over 2008 baseline

2010 Annual number of sheets of copy paper used per employee

12,700 (2007)

1. Not Available.

Zero waste to landfill Purchase environmentally preferable products

Carollo’s approach to achieving the goal of zero waste to landfill focuses on the three Rs: Reduce, Reuse, Recycle… and adds a fourth - Rethink!

Carollo’s approach to environmentally preferable purchasing (EPP) is to first focus on paper and then develop a strategy based on a purchasing audit.

Steve Kessler loads paper in a printer

that WCO has converted to print on

one-side-used paper.

In 2009 Carollo

began printing

Research Solutions

Newsletter on

100% recycled,

50% post-consumer

recycled content,

FSC-certified paper.

Carollo uses

Steelcase Leap

chairs, a Cradle to

Cradle Certified

Silver product.

REDUCE

RECYCLE REUSE

7 8

PEOPLE

Identify employee recruitment and retention metrics and •baseline data

Include sustainability information in new-hire orientation •materials

Offer employee training through Northwest Earth •Institute (NWEI) discussion course

Next Steps

Carollo will continue companywide support of Water for People and other local non-profit organizations. We will also continue to support and foster employee engagement in outreach activities, both to improve the lives of others and to help ensure long-term workforce sustainability in our industry.

Our approach to attract and retain talented staff is two-fold. We will continue to offer competitive benefits as well as work to engage employees in sustainability activities and improve communications about our successes.

Recent AchievementsEstablished Green Teams (GTs) in four offices. Initial •GT activities include: measuring and reducing paper use, reducing waste and increasing recycling rates, reducing office energy use, and encouraging eco-friendly employee commute strategies.

Set up a sustainability blog in December 2008 •to create an in-house forum for sustainability discussions.

Launched a quarterly sustainability e-newsletter, • The Ripple, on Earth Day 2009 to share information on sustainable activities at Carollo.

Incorporated sustainability language into key documents.•

Recent AchievementsConducted a survey and featured employee outreach •and service efforts in the October 2009 edition of Carollo’s employee newsletter.

Employee Lyn Gomes published an article in the •August 2009 AWWA Journal entitled “Bridging the Industry Workforce Gap through Community Outreach,” which outlined strategies for encouraging today’s youth to consider careers in the water and wastewater fields.

Develop outreach plan targeting primary/•secondary school levels

Contribute to long-term workforce sustainability in our industry

Attract and retain smart, talented professionals

Next Step

2025 Objective: Attract and retain smart, talented professionalsNear-Term Targets By When? Metric Status 2009

Goal: Engage employees in sustainability efforts

Establish four green teams

2009 Number of GTs/number of GT participants

4/67

Implement sustainable actions

Annual Number of sustainability ideas generated/number implemented per year

73/34

Annual savings from sustainable actions

$480,000

Number of projects completed by green teams

9

Annual savings from projects implemented by green teams

$20,000

Establish a sustainability blog

2009 Average distinct users per month 20

Minimum 20% of staff participate in NWEI “Sustainable Systems at Work” discussion course

2010 Number of employees completing discussion course

0

2025 Objective: Contribute to long-term workforce sustainability in our industry

Near-Term Targets By When? Metric Status: 2008

Goal: Encourage young people to enter technical fields

Increase number of students contacted through outreach efforts by 5% per year

Annual Number of students contacted through Carollo outreach

1,100

Minimum of two employees per office participating in local outreach programs

2015 Number of employees per office engaged in outreach efforts

1.4 (40 people in

28 offices)

Our people are our most important

asset. We know that many of our

employees value sustainability, and

Carollo aims to provide opportuni-

ties for the ‘best and brightest’ to

apply their creativity to solving

the sustainability challenges we

face in meeting our mission of

providing clean water.

The social aspect of sustain-

ability is about meeting

human needs worldwide.

Carollo provides meaning-

ful employment and good

wages and benefits, as

well as a long history of

community service.

Our industry is anticipating a

future shortage of qualified

water industry professionals.

Carollo is committed to engaging

students and sustaining their

interest in engineering and water

quality related fields to help

improve future prospects.

Encouraging and supporting

employee involvement in

such outreach activities also

offers opportunities for our

employees to contribute in

meaningful ways.

For the last four years, Carollo’s Walnut

Creek, CA office has hosted girls from local

junior and high schools for ‘Introduce a Girl

to Engineering Day.’ In this photo, Lyn Gomes

leads an activity in water filter design.Keli Callahan and Lisa Freestone from

Carollo’s Las Vegas, NV office assist the FIRST

(For Inspiration and Recognition of Science

and Technology) program. FIRST engages

primary through high school students

with competitions that challenge them to

generate creative solutions to specific real

world problems.

34: Number of

sustainable ideas

implemented

across the

company in 2009

9 10

Carollo has been engaged in delivering sustainable services for a number of years. Clients are increasingly including sustainability in their requests for proposals (RFPs) and our objective for the future is that all projects will incorporate sustainability... that it will just be the way we do business.

Sustainability40%

Energy Conservationand Renewables

28%

WaterConservation

17%

ClimateChange

9%

LEED5%

LID1%

Sustainability begins with how we make decisions. Carollo has integrated sustainability into alternative analyses for several projects, using life cycle thinking and criteria based on the Triple Bottom Line, the Ecological Footprint, and the Natural Step.

City of Petaluma, California, Water Recycling Facility

Carollo first incorporated sustainability into decision-making for the City of Petaluma, California. In 2000 we undertook a wastewater treatment plant study for the City. Carollo pioneered the use of the Ecological Footprint as an evaluation criterion for project alternatives, developed a technical memorandum of sustainable elements to consider, and designed polishing wetlands and many green building features into the project.

Greenhouse Gas Emissions Modeling

Using a model developed in-house, Carollo estimated greenhouse gas (GHG) emissions for alternatives on several projects to improve alternatives selection.

Develop metrics and •baseline data to track project sustainability implementation progress

Develop comprehensive •sustainability evaluation criteria, guidance and tools

Promote use of sustainability •checklists on projects

Roll out goals and process to •“green” specifications

Assess client needs, business •opportunities, and risks associated with potential new practice areas

Next Steps

cccsd808g1.ai

Met

ric T

ons

CO

2e

Existing Baseline Alt 1 Alt 2 Alt 3 Alt 4

5.0E+04

4.0E+04

3.0E+04

2.0E+04

1.0E+04

0.0E+00

-1.0E+04

Natural Gas Production EmissionsChemical Production Emissions

Electricity Emissions including T&D Loss

Solar Power*Transportation Emissions

*The offset is small relative to the other emission sources.

Carollo calculated and evaluated the carbon dioxide equivalent

(CO2e) emissions related to treatment operations and collection

system pumping for each project alternative developed for the

San Francisco Public Utility Commission’s 30-year Wastewater

Master Plan.

2025 Objective: Deliver sustainable servicesNear-Term Targets By When? Metric Status 2008

Goal: Build capacity and expertise to deliver sustainable services

100% of projects include sustainability (sustainable services is standard practice)

2025 % of projects that implement sustainable elements (based on annual revenues)

N/A1

Develop comprehensive sustainability evaluation criteria, guidance, and tools

2010

Green specifications 2012 Number of existing sections edited to be more sustainable

0

Number of sustainable sections added

1

Train professionals in sustainable design

Ongoing Number of LEED Accredited professionals on staff

15

Goal: Be a recognized leader in sustainability

Help lead the industry by sharing what we learn

Ongoing Number of technical papers published/presented on sustainable topics

9

1. Not Available.

Carollo’s largest impacts are from the

facilities we plan and design. What if

our water systems:

Maintained the hydrological •and biological functions of the watersheds in which they are embedded?

Used 100 percent renewable •energy?

Used only safe materials?•

Eliminated unwanted •byproducts?

Returned nutrients back to •the soil?

Created habitat? •

These are the questions we

are asking. From expanding

decision criteria that consider

a more comprehensive range

of impacts, to creating ‘closed

loop’ systems that eliminate

the concept of ‘waste’ — we

are growing our portfolio of

sustainable solutions.

PROSPERITY Deliver sustainable services

Sustainability-related

RFP’s received 2003-08,

categorized by topic.

Recent AchievementsDelivered sustainable services on many projects; some are •described on the following pages.

Developed and maintains a Greenhouse Gas Emissions Model used •for regulatory compliance and decision-making purposes.

Developed sustainability checklists for project management, •planning, design, and construction management through a comprehensive effort by many offices.

Developed a plan to ‘green’ standard specifications.•

Petaluma polishing

wetlands provide

wildlife habitat

and hiking trails.

The green roof on Petaluma’s

Operations, Lab, Maintenance and

Administration Building conserves

energy by increasing the roof’s

insulation value.

Carollo’s GHG emissions

model produces GHG

emission inventories for

all stages of a facility’s

life cycle and is kept up

to date with the latest

information.

11 12

ENERGY Efficiency and Renewables

In addition to sustainability evaluation tools and green building techniques, Carollo plans and designs facilities and processes to enhance energy efficiency and produce clean energy. As we develop energy programs, we evaluate ways to conserve energy, more effectively utilize/enhance digester gas, and utilize other power generation technologies, such as solar, wind, fuel cells, and hydroelectric power. Carollo strives to apply

the most cost-effective

and ecologically restorative

methodologies to improve the

world’s water. Not only have

we completed many projects

using a variety of sustainable

technologies; we have also

invented or validated new, more

sustainable technologies.

Carollo worked with PAX Scientific to validate

the bio-inspired PAX Water Mixer for use in

maintaining water quality through low-energy

mixing in drinking water tanks and reservoirs.

The mixer is a very small, efficient impeller that

emulates nature’s spiral flow geometry and can

move the entire volume of a 7 million gallon

tank using only 300 watts of power.

Carollo assisted the City of Tulare, California, with

the procurement of a 900-kW fuel cell facility.

By implementing

system optimization

recommendations for

pump operations, the City

of Olathe, Kansas, realized

significant power savings.

INNOVATION toward more sustainable technologies

Limits drive innovation. Recognizing and working within nature’s limits is what sustainability is all about. Carollo develops more sustainable water treatment technologies that do more using fewer resources. We also help others validate new technologies to meet sustainability objectives.

Inventing more sustainable processes

BIOBROx

Carollo invented one such process called BIOBROx (U.S. Patent No. 7,318,895) that treats challenging waste streams from drinking water treatment plants. Using minimal energy, a small footprint, and no chemicals, BIOBROx converts multiple contaminants in these waste streams to harmless by-products, consequently producing water that can be used for reuse applications.

IMANS®

IMANS® (integrated membrane anaerobic stabilization) is a simple and innovative approach to treating wastewater that eliminates aerobic treatment. Instead, an anaerobic process is used that significantly reduces energy use and biosolids production, while increasing methane production… all in a small footprint.

Validating more sustainable technologies

Carollo validates new technologies for use in the water industry. Recently, we certified pasteurization to disinfect reclaimed water. Pasteurization is a chemical free, low energy method of disinfection. Key advantages include: no chemicals, no moving parts, no DBPs, robust pathogen disinfection… and a small footprint.

PAX Water

Biomimicry is an old practice and an emerging discipline that emulates nature’s best ideas to solve human challenges; it is gaining momentum and driving sustainable innovation in a variety of sectors. Our exploration of how to apply biomimicry in our industry led us to collaborate with PAX Water to help them bring their first biomimicry-inspired product to market in our industry.

Carollo recently completed

design, construction, and start-up

of a 3.8-mgd biological facility

in Magna, Utah, that removes

perchlorate and nitrate from

membrane concentrate; this is

the first facility of its type in the

world.

The IMANS® approach has

a lower cost and smaller

footprint.

Carollo is a leader in energy recovery in wastewater treatment plants through co-generation and fuel cell systems. In fact, Carollo has planned or designed 11 of the 17 U.S. fuel cell projects currently operating or being planned, designed, or

constructed at wastewater treatment facilities.

Carollo is also leading the industry in enhancing anaerobic digestion with high-strength organic materials to increase and improve the production of digester gas. We are currently working with over a dozen utilities to identify, coordinate, and incorporate these materials into the digestion process. The result is increased production of a clean, renewable energy source (methane) for heating or electricity production.

Carollo designed facilities for the City of Waco,

Texas, to accept high-strength organic wastes

from local industries directly into their digesters

to increase gas production. The City is also

encouraging residents to recycle their used

cooking oil!

Photo credit: PAX Scientific, Inc. with all rights reserved.

Slud

ge P

rodu

ctio

n an

d Tr

eatm

ent C

ost

Foot Print

IMANS System®

Conventional Treatment Approach

0Jan

Flow = 317 MG Flow = 293 MG Flow = 314 MG Flow = 316 MG Flow = 367 MG Flow = 462 MG Flow = 517 MG Flow = 569 MG

Feb Mar Apr May Jun Jul Aug

50

100

150

200

250

300

Act

ual C

ost p

er M

G (

$)

Month

Olathe Power Cost Use

Implemented High Service PumpStation Functionality (1/2 month in April)

No pump optimizationPump optimization

13 14

carollo.com