1. Building lifetime relationships with our clients and employees. Cornerstone Presentation Title Slide A Sub Title Goes Here February 20, 2014

2. Building lifetime relationships with our clients and employees. Cornerstone Presentation Title Slide B Sub Title Goes Here February 20, 2014

3. Building lifetime relationships with our clients and employees. Cornerstone Presentation Title Slide C Sub Title Goes Here February 20, 2014

4. Sample Interior Slide Level 1 with Bullet, Arial, 26pt Level 2 with Bullet, Arial, 23pt Level 3 with Bullet, Arial, 20pt Level 4 with Bullet, Arial, 17pt Level 5 with Bullet, Arial, 14pt © 2014 Cornerstone. All rights reserved. | Confidential 4

5. Mission Statement Provide the highest quality of services, from project concept through completion. Focus on responsiveness and superior client service that exceeds our clients’ expectations on every project. Provide a rewarding and challenging work environment that invites innovation and a strong passion for our work. © 2014 Cornerstone. All rights reserved. | Confidential 5

6. Operational Locations © 2014 Cornerstone. All rights reserved. | Confidential 6 Bolingbrook, IL Cincinnati, OH  Colbert, WA Exton, PA East Brunswick, NJ Farmington Hills, MI  Ft. Lauderdale, FL  Grand Rapids, MI Greenwich, NY Jacksonville, FL  Kansas City, KS Logan, OH Madison, WI Middletown, NY  Oceanside, CA Pittsburgh, PA Plymouth, WI  Reading, MA Rochester, NY  Springfield, IL  St. Louis, MO Tucson, AZ  Middletown, NY Office Locations Satellite Offices Headquarters

7. Management Team B © 2014 Cornerstone. All rights reserved. | Confidential 7 Richard A. Peluso, P.E. President Dennis G. Fenn, P.E. Senior Vice President Matthew E. Davies Vice President, Business Development Kenneth J. Karl Vice President, Operations West Paul Stout, P.E. Area Manager, Dublin, CA Garth Bowers, P.E. Area Manager, Tucson, AZ Colbert, WA Central Mark Torresani, P.E. Area Manager, Madison, WI Plymouth, WI Adam Larky, P.E. Area Manager, Farmigton Hills, MI Grand Rapids, MI Bolingbrook, IL St. Louis, MO Overland Park, KS Bruce Schmucker, P.E. Area Manager, Cincinnati, OH Logan, OH Springfield, IL East Gary DiPippo, P.E. Area Manager, Middletown, NY Rochester, NY Greenwich, NY Exton, PA Pittsburgh, PA Reading, MA East Brunswick, NJ Michael S. Michels, P.E. Vice President, Technical Dave Damon, CFO James Bradley, Legal Cathie Swyka, CAO

8. Service Capabilities From Conception to Completion Environmental and remediation services Hydrogeology services Operations and maintenance Air quality services Site and civil design services Biogas services Landfill engineering and design Transfer, recycling, and processing facilities © 2014 Cornerstone. All rights reserved. | Confidential 8