Business Editors

PASADENA, Calif.

Any statements made in this release that are not based on
historical fact are forward-looking statements.

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W.S.pbsj. and abroad.

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Hutchison +
Associates, LLC (AWH), international leaders in providing construction
dispute resolution and project risk management services, announced
today the addition of William R. The employee-owned
firm is ranked by Engineering News-Record as 21st among the nation's top
consulting firms.

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McNeel, AIA, and M. In addition to owning
and operating his own highly successful mechanical contracting firm,
Mr. Brian functioned as area manager in two major markets and
successfully established new branch offices in each. He has extensive
experience in all aspects of the automotive, petrochemical, power, and
steel industries with specialized skills in the areas of piping, sheet
metal, pipe pre-fabrication, millwright and rigging, and civil
construction .

Land + Water Consulting Inc. Joins PBS+J

This year, PBS+J ( http://www.

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,
Heery Program Management, Inc., a 43-person engineering and natural resource
consulting firm headquartered in Missoula , Montana.com/cgi-bin/prnh/20021010/FLTH007LOGO )
Land + Water specializes in the assessment and restoration of natural
resources throughout the Northwest and northern Rockies, and it joins PBS +J as
a division of the firm's Environmental Services.E.

Consultants are not linked with products or methods but respond to each project based upon the clients vision and budget.

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Prior to joining AWH , Mr. Brian has successfully bid, managed and been
directly responsible for many significant industrial , private, and
commercial projects.S.

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Based in Atlanta, Georgia, William R. McNeel has authored professional practices
manuals for construction program management services delivery and
taught these management principals at seminars and universities
throughout the U. Richard Brian, Project Manager, has been engaged in the
construction industry, construction management, and operations
management for over thirty years."
"PBS+J is a national firm with a growing presence in the West.

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The contract is worth up to $100 million over three
years, and involves installation of integrated nuclear material
detection systems outside of the United States to minimize the risk of
nuclear proliferation and terrorism.com

Tetra Tech is a leading provider of consulting, engineering and
technical services . With nearly 8,000 associates located in the United
States and internationally, the Company supports commercial and
government clients in the areas of resource management, infrastructure
and communications . For a description of Future
Factors that could cause actual results to differ materially from such
forward-looking statements, see the discussion under the section "Risk
Factors" included in the Company's Form 10-K and 10-Q filings with the
Securities and Exchange Commission.

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He is a member of the American Institute of
Architects and the Construction Management Association of America, and
he is certified with the National Council of Architectural Boards. Richard Brian is an Honorary Life Member of both
the Mechanical Contractors Association of Windsor, Ontario and the
Windsor Sheet Metal Contractors Association.W.
Tetra Tech has performed similar work for NNSA over the past two
years including the fast-track design and installation of a nuclear
detection system across Greece , which was successfully completed in
time for the 2004 Olympic Games in Athens.tetratech.

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Richard Brian to
their firm of construction management professionals.

About Tetra Tech (www.

Consultants provide design services from concept development, through models and visulisations to final realisation and production oversight.

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"The addition of Bill and Richard to our team of Construction
Management Professionals further expands and strengthens our firm's
expertise in the areas of construction program management, project
delivery consulting, expert design evaluation, scheduling, and
operations management," said Steven A.

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Mr. "We look forward to the thorough knowledge and energy they
will extend to our Owner, Contractor, and Construction Attorney
clients on major capital construction projects worldwide.

However, Tetra Tech's actual
outcome and results are not guaranteed and are subject to certain
risks, uncertainties and assumptions ("Future Factors"), and may
differ materially from what is expressed.

linked consulting

"Bill" McNeel, Senior
Project Consultant, brings over 30 years of experience in construction
management, program management, project delivery, and architectural
design expertise to AWH. We expect both companies' clients to benefit," said PBS+J
President Todd J.

Tetra Tech Awarded $100 Million to Support DOE Nuclear Security Program

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Business Editors

DETROIT + ATLANTA ----A. McNeel held key
management and executive positions at Rosser International, Inc. Department of
Energy (DOE) with the National Nuclear Security Administration's
(NNSA) Second Line of Defense Program by Ahtna Government Services
Corporation.

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His professional services include design, project
delivery management, and construction program management, and he has
developed program management procedures, methodologies and project
controls systems currently in use by several construction and program
management firms.
"The merger offers both companies the opportunity to expand geographically
and technically.

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The firm's commitment to a
high standard of excellence complements PBS+J's own .----Tetra Tech, Inc. Tetra Tech's services include research and
development, applied science and technology, engineering design,
program management, construction management, and operations and
maintenance .

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William R. McNeel AIA and M. Richard Brian Join A.W. Hutchison + Associates LLC Construction Dispute Resolution and Risk Management Professionals

Mr. Any forward-looking
statements made in this release represent management's best judgment
as to what may occur in the future.

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Working primarily in the mechanical
and electrical fields, he has developed highly specialized skills in
estimating , scheduling, and project management.S. The construction services consist of providing oversight for
local contractors.

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, Powell Management Associates, and
Construction Control Corporation, in addition to three businesses
which he founded. Hutchison +
Associates.
(Logo: http://www. PBS+J has 70 offices that span the nation, with a focus
on growth in the West. Over the past decades, PBS +J has expanded
from a small Southeast-based engineering firm to a nationwide leader in civil,
construction , environmental, and transportation markets. PBS+J posted revenues of $451 million in 2004.

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newscom.com ) celebrates its 45th year of
continuous growth and success in meeting the challenging planning,
environmental, engineering, architecture, construction management, and program
management needs of its clients.

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Merger Expands Both Firms' Geographic Coverage and Technical Resources

MISSOULA, Mont. This
partnership will enable Land + Water to continue our efforts to offer
excellent service to our clients in Montana and throughout the Rocky Mountain
West," said Paul Callahan, president of Land + Water, who now holds the title
of vice president and division manager .

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"For PBS+J's clients, Land + Water brings
considerable expertise in several key disciplines: stream and wetland
restoration, water resources, environmental assessment and restoration, water
rights, and regulatory permitting and compliance.

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M." Since 1980,
A. Land + Water has offices in
the Montana cities of Missoula, Bozeman, Kalispell, and Helena, and in
Spokane, Washington .
(NASDAQ:TTEK) announced today that it has been awarded a Design,
Construct and Integration contract to support the U.

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W., PBS+J announces its merger with
Land + Water Consulting, Inc.
The contract scope of work includes network planning, engineering
design, integration of multiple contractors , and logistical and
construction services for various electrical, civil and communications
systems .

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Huyghe, CEO of A. Hutchison + Associates, LLC (AWH) has grown to become one of the
most sought after construction management consultancies in the world. Kenner, P. PBS+J has 3,600 employees and 70 offices located throughout
the U.