| Engineers/Structural | | McPherson Design Group, p.c. | Member Since: Oct 2000 | | | Member(s): Michael R. McPherson, Roland E. McPherson, Diana L. Warren |
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| | Stroud, Pence & Associates, Ltd. | Member Since: Feb 2000 | | Comprehensive structural engineering services for buildings and other structures throughout the mid-Atlantic region | | | Member(s): David W. Mykins, Roger G. Stroud, Karen M. Tasch |
| | Engineers/Traffic | | Kimley-Horn and Associates, Inc. | Member Since: Jan 1998 | | | Member(s): Miriam Brodie, G. Eric Doering, W. David France, Edward A. Marscheider, J. Randall Royal, Thomas J. Sauro |
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| | LandMark Design Group, Inc. | Member Since: Jan 1993 |
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| | Renaissance Planning Group | Member Since: Dec 2004 | | Specializes in integrating transportation, land use, urban design, technology to develop quality environments/livable communities. |
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| | Timmons Group | Member Since: Feb 2007 | | | Member(s): Christopher N. Parker, Robert G. Roop |
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| | Vanasse Hangen Brustlin, Inc. | Member Since: Jul 2001 | | | Member(s): David W. Andrea, Larry S. Barry, Scott Chewning, Daniel Davies, Myrina Gaglione, K. Kelly Holloman, Evelyne A. McCamley, R. Neville Reynolds, Vaughn B. Rinner, Kimberly D. Rivers, Kenneth E. Rodman, Jr., P.E., Stephen A. Romeo, Alvin D. Sledd, John M. Stronach |
| | Environmental | | Advanced Restoration Services, Inc. | Member Since: May 2009 | | | Member(s): Ruthi Lee |
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| | Apex Companies, LLC | Member Since: Mar 2010 | | Full Service Environmental/Remediation Services; Property Assessments, Wetlands, Stormwater, LEED, Asbestos/Lead, USTs removal/cleanup. | | | Member(s): Richard D. Lutz |
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| | ATC Associates Inc. | Member Since: Jun 2003 | | Full-service Environmental & Geotechnical consultant, property assessments, mold, asbestos, lead, expert witness, hazardous materials | | | Member(s): Eric Shertzer |
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