| 1 | 1 | United Cleanup Oak Ridge LLC (UCOR)
701 Scarboro Road
Oak Ridge, TN 37830
| 865-576-8321
ucor.com
2,122 / 2,122
| Y
| Y
| Y
| Y
| Y
| Environmental cleanup; radioactive waste management, environmental monitoring and restoration, asset management
| Amentum
Jacobs
Falls Church, VA
Dallas, TX
| Ken Rueter
President, CEO
2011
|
| 2 | 2 | Atkins Nuclear Secured
545 Oak Ridge Turnpike
Oak Ridge, TN 37830-7187
| 865-483-8247
atkinsglobal.com/nuclear
248 / 534
| | Y
| Y
| Y
| Y
| Nuclear safety, project management, business support services, quality assurance, staff augmentation, radioactive waste management
| SNC-Lavalin
Montreal, QC Canada
| Tom Jouvanis
President
2001
|
| 3 | 4 | GEM Technologies
2033 Castaic Lane
Knoxville, TN 37932
| 865-560-9434
gemtechnologiesinc.com
238 / NA
| | Y
| Y
| | Y
| Radiological and hazardous decontamination and demolition, waste management, infrastructure support
| NA
NA
| Michael Evans
President, CEO
1994
|
| 3 | 3 | Strata-G, LLC
2027 Castaic Lane
Knoxville, TN 37932
| 865-934-3400
stratag.org
238 / 258
| Y
| Y
| Y
| Y
| Y
| Utilities, infrastructure, ES&H, nuclear operations, waste management
| NA
NA
| Elliott Barnett
John Patterson
CEO
President
2002
|
| 5 | 5 | North Wind Group
2800 Solway Road
Knoxville, TN 37931
| 865-556-8014
northwindgrp.com
196 / 2,097
| Y
| Y
| Y
| Y
| Y
| NA
| Cook Inlet Region Inc.
Anchorage, AK
| Christopher Leichtweis
CEO, president
1997
|
| 6 | 6 | Spectra Tech, Inc.
132 Jefferson Court
Oak Ridge, TN 37830
| 865-483-7210
spectratechinc.com
137 / NA
| Y
| Y
| Y
| Y
| Y
| NA
| NA
NA
| Dr. Loong Yong
President
1995
|
| 7 | 7 | Perma-Fix Environmental Services
1093 Commerce Park Drive, Ste. 300
Oak Ridge, TN 37830
| 865-690-0501
perma-fix.com
111 / 374
| | Y
| Y
| | Y
| Nuclear/radioactive waste management
| Perma-Fix Environmental Services
Atlanta, GA
| Mark Duff
President, CEO
1990
|
| 8 | 9 | Boston Government Services (BGS)
105 Mitchell Road, Ste. 101
Oak Ridge, TN 37830
| 866-730-7353
bgs-llc.com
103 / 260
| | Y
| Y
| | Y
| Engineering design, nuclear safety analysis, nuclear criticality safety, nuclear operations support, capital project management, waste planning
| NA
NA
| Harry Boston
President, CEO
2007
|
| 9 | 8 | SES Group of Companies
1006 Floyd Culler Court
Oak Ridge, TN 37830
| 865-481-7837
specproenv.com
100 / 535
| | | Y
| Y
| Y
| Design-build and design-bid-build construction, heavy and civil construction, DoD fuel systems construction
| Bristol Bay Native Corp.
Anchorage, AK
| Basil Skelton
President, CEO
1992
|
| 10 | 10 | S&ME Inc.
1413 Topside Road
Louisville, TN 37777
| 865-970-0003
smeinc.com
76 / 1,128
| Y
| | Y
| Y
| Y
| Geotechnical and civil engineering, environmental, construction services, land development, planning, geomatics
| S&ME Inc.
Louisville, TN
| Elizabeth Porter
Randal Martin
Leira Douthat
Ken Barry
Michael Stomer
Eric Solt
Rob Sanders
Brad Salsbury
VP
VP
VP
VP
VP
Environmental senior project manager
Geomatics group leader
Senior project manager
1988
|
| 11 | 13 | Barge Design Solutions, Inc.
520 W. Summit Hill Drive, Ste. 1202
Knoxville, TN 37902
| 865-637-2810
bargedesign.com
64 / 461
| | | Y
| Y
| Y
| Multidisciplinary engineering (civil, transportation, mechanical, electrical, structural, hydrologic/hydraulic, and environmental), architectural, landscape architectural, interior design, geomatics, management consulting, and information management services
| Barge Design Solutions, Inc.
Nashville, TN
| Casey Tyree
VP
1972
|
| 12 | 15 | Navarro Research and Engineering Inc.
1020 Commerce Park Drive
Oak Ridge, TN 37830
| 865-220-9650
navarro-inc.com
60 / 600
| Y
| Y
| Y
| Y
| Y
| Waste management
| NA
TN
| Susana Navarro
President
1993
|
| 13 | 16 | Civil & Environmental Consultants Inc.
2704 Cherokee Farm Way, Ste. 101
Knoxville, TN 37920
| 865-977-9997
cecinc.com
58 / 1,304
| | | Y
| Y
| Y
| Phase I/due diligence, site investigation, remediation hydrogeology, groundwater modeling, permitting, compliance
| Civil & Environmental Consultants Inc.
Pittsburgh, PA
| Aaron Henry
P.E. principal, office lead
2014
|
| 13 | 11 | Wood Environment & Infrastructure Solutions, Inc.
2030 Falling Waters Road, Ste. 300
Knoxville, TN 37922
| 865-671-6774
woodplc.com
58 / 40,000
| Y
| Y
| Y
| Y
| Y
| Environmental investigation, remedial design and implementation, water, permitting, mitigation
| Wood PLC
Aberdeen, Scotland
| Edwin Watkins
Operations manager
1972
|
| 13 | 11 | GEOServices
2561 Willow Point Way
Knoxville, TN 37931
| 865-539-8242
geoservicesllc.com
58 / 136
| Y
| Y
| Y
| Y
| Y
| Construction services, laboratory services
| GEOServices
Knoxville, TN
| Dennis Huckaba
Professional engineer, president
2006
|
| 16 | 14 | Alliant Corporation
320 N. Cedar Bluff Road, Ste. 200
Knoxville, TN 37923
| 865-934-2222
alliantcorp.com
56 / NA
| | | Y
| Y
| Y
| Energy management, engineering, project control and management, estimating, geoenvironmental, field operations support
| NA
NA
| Terence Douglas
Greg Galaher
President
Executive VP
2000
|
| 17 | 18 | XCEL Engineering Inc.
1066 Commerce Park Drive
Oak Ridge, TN 37830
| 865-481-3200
xceleng.com
47 / NA
| | | Y
| Y
| Y
| NA
| NA
NA
| Joe Zimmerman
Dr. Iqbal Ahmed
President
VP
2003
|
| 18 | 17 | Amentum
105 Mitchell Road, Ste. 200
Oak Ridge, TN 37830
| 865-425-7000
amentum.com
44 / NA
| | | | | | NA
| Amentum
Germantown, MD
| Cheryl Cabbil
Robert Sledzik
Richard Giannelli
Paul Gubanc
VP
VP
PE, senior project manager, office manager
PE chief nuclear safety officer
1999
|
| 19 | 19 | Strata Environmental Services
110 Perimeter Park Road, Ste. E
Knoxville, TN 37922
| 865-539-2077
strataenv.com
30 / 30
| Y
| | Y
| Y
| Y
| Environmental due diligence; environmental outsourcing (air, water, waste, fueling); and environmental management software
| NA
NA
| Kevin Parr
President
1992
|
