Sustainability Report Card

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Tetra Tech's sustainability metrics are used to report, evaluate, and track our performance. By evaluating our contributions to sustainability, we have the opportunity to improve management, make our operations more efficient, and provide better long-term solutions for our clients – solutions that respond to critical global issues, environmental challenges, and the values important to our stakeholders.

In compiling our Sustainability Report Card, we measure our sustainability progress in core areas of company operations. Each metric corresponds with one or more performance indicator from the Global Reporting Initiative (GRI), the internationally predominant sustainability reporting protocol for corporate sustainability plans. The indicators reported apply to our business in a meaningful way and represent ongoing activities related to Tetra Tech's 3Ps: projects, procurement, and processes. These metrics were chosen as repeatable and effective measures of our performance and progress.

In order to track our progress and improvements, we have established a current score or progress estimate for each target. Certain metrics are tracked by fiscal year while others are tracked by calendar year, as specifically noted below. The scores are updated annually to reflect our sustainability progress and achievements.

Visit our Sustainability Performance Indicators page to learn more about how these metrics correspond to economic, environmental, and social responsibility.

Tetra Tech's Sustainability Report Card provides an overview of our sustainability performance, but cannot be inclusive of the full range of our employees' sustainability activities around the world. To see selected examples of sustainability initiatives across Tetra Tech, please visit our Sustainability Highlights page.

Overarching Corporate Metrics
Reportable Metric	Related GRI Performance Indicator	Metric Target	Fiscal Year 2011 Status	% Change from FY `10
Revenue Growth	Economic > Economic Performance – EC1	15% average annual growth rate through 2015	$2.6 billion	17% improvement
Headcount Growth	Labor Practices > Employment – LA1	15% average annual growth rate through 2015	13,000	24% improvement
Carbon Emission Annual Reporting	Environmental > Emissions, Effluents and Waste – EN 16, EN 17 & EN 18	Reduce GHG emissions by 20% per associate by 2015	3.45 metric tons CO2e per associate in CY'10	16% reduction*

Real Estate
Reportable Metric	Related GRI Performance Indicator	Metric Target	Fiscal Year 2011 Status	%
Footprint	Environmental > Energy – EN5	Maximize space efficiency and reduce footprint	Since FY'08, reduced space by 367,000 square feet In CY'11 had 246 square feet per FTE	11% reduction 6% reduction

Information Technology
Reportable Metric	Related GRI Performance Indicator	Metric Target	Fiscal Year 2011 Status	%
Percent of Computers Less than 5 Years Old	Environmental and Economic	Maximize use of new energy efficient computers	89%	1% improvement
Percent of Tetra Tech on Tetra Linx	Environmental and Economic	100% of Tetra Tech operating units on our web-based administrative system	87% by revenue	3% improvement
Number of Associates per IT System Servers	Environmental > Energy – EN 6	Increase	9.6	9% improvement*

Health and Safety
Reportable Metric	Related GRI Performance Indicator	Metric Target	Fiscal Year 2011 Status	%
Lost Workday Incidents	Labor Practices > Occupational Health and Safety – LA7	To achieve and maintain zero lost workday incidents on an annual basis	32 Tetra Tech operating units worked all of 2011 with zero lost workday incidents for over 18 million hours worked Since 2005, Tetra Tech has reduced its Lost Workday Incident Rate by more than 73%	50% improvement . . . 6% reduction
Recordable Incident Rates	Labor Practices > Occupational Health and Safety – LA7	Focus on continual improvement and achieve a Total Recordable Incident Rate better than the industry average	18 Tetra Tech operating units worked all of 2011 with zero recordable injuries or incidents for over 8 million hours worked Since 2005, Tetra Tech has reduced its Total Recordable Incident Rate by more than 63% Tetra Tech performs 43% better than the US Bureau of Labor Statistics 2010 national averages for Recordable Incident Rate for our industry	167% improvement . . 5% reduction . n/a
Occupational Health and Safety Awards and Recognition	Labor Practices	To recognize health and safety efforts and raise company awareness of health and safety achievements company wide	Tetra Tech received multiple national and client recognitions for our safety performance in 2011	n/a

Human Resources
Reportable Metric	Related GRI Performance Indicator	Metric Target	Fiscal Year 2011 Status	%
Promotions from Within	Labor Practices > Employment – LA 2	Increase year over year	484	38% improvement
Training Expenditures per Associate	Labor Practices > Training and Education – LA10	Increase year over year	$683	5% improvement
Certifications per Associate	Labor Practices > Training and Education – LA11	Increase year over year	0.31	15% improvement

Shared Services
Reportable Metric	Related GRI Performance Indicator	Metric Target	Fiscal Year 2011 Status	%
Office Supply Costs per Associate	Environmental > Energy – EN6	Reduce use of consumable office supplies	$482 per FTE	2% reduction*
Overnight Courier Shipments	Environmental > Transport – EN29	Reduce	45% reduction in courier shipments since 2007	3% reduction*

Business Development Support/Communications
Reportable Metric	Related GRI Performance Indicator	Metric Target	Fiscal Year 2011 Status	%
Use of Electronic Marketing Instead of Print Media	Environmental > Materials – EN2	Reduce number of paper materials	Electronic invitations to Tetra Tech conference events: 3,945 Electronic holiday cards sent: 4,200	n/a
		Number of visitors to the marketing Intranet website	285 visits/month	n/a
		Improve the sustainability of paper materials that are used	FSC-Certified paper material: 5,003 pounds (100% of paper) Recycled paper material: 4,080 pounds (82% of paper) Non-recycled paper material: 0 pounds (0% of paper)	n/a

* Items with an asterisk denote changes to baseline measurement resulting from additional information or improved measurement techniques. Details are available upon request.