Programs that work for you

"They are rigorous, they’re about making sure our labs, personnel, and test methods conform, that they’re in compliance. They’re independent, not driven by a vendor or a construction company.”

California Department of Transportation

Philip Stolarski, Former Deputy Division Chief, DES-METS & GS 

55+ years of experience
PSP participants
samples shipped per year
laboratory assessments per year
accredited labs

Contact Us

Phone: 240-436-4900
Fax: 240-436-4899
Mailing Address:
AASHTO re:source
4441 Buckeystown Pike
Suite A
Frederick, MD 21704
All visitors must have
an appointment.

Have a Question?

General Information
Normal Business Hours: Monday - Friday 7 a.m. - 4 p.m. Eastern Time
AASHTO re:source observes all U.S. Federal holidays.  

Cement and Concrete Reference Laboratory (CCRL) Information:
Website: www.ccrl.usEmail: | Phone: 240-436-4800 | Fax: 610-834-7066

To Send Email: use email names listed below followed by


Steven Lenker, P.E. Director - Construction Materials Reference Laboratories (AASHTO re:source/CCRL) slenker 240-436-4770
Robert Lutz AASHTO re:source Manager rlutz 240-436-4801
Tracy Barnhart Quality Manager tbarnhart 240-436-4802
Troy Benedict IT Manager tbenedict 240-436-4803
Kate Humphries  Training Manager  khumphries 240-436-4839
Kim Swanson Communications Manager kswanson 240-436-4807
Greg Uherek Program Manager of Business Development & Technical Services guherek 240-436-4840


Sara Holsinger Office Manager sholsinger 240-436-4809
Stephen Amaya Administrative Assistant  samaya 240-436-4806
Mark Ambrosini Administrative Assistant  mambrosini  240-436-4808

AASHTO Accreditation Program (AAP)

Email for general AASHTO Accreditation help and questions. 
Find Your Quality Analyst by State or Province

Brian Johnson Program Manager bjohnson 240-436-4820
Amy Reed Associate Program Manager areed 240-436-4860
Trudy Eckstine Senior Quality Analyst teckstine 240-436-4824
Pete Holter Senior Quality Analyst pholter 240-436-4822
Jon McCabe  Senior Quality Analyst jmccabe 240-436-4864
Joe Williams Senior Quality Analyst jwilliams 240-436-4876
Bernadette Cummings Quality Analyst bcummings 240-436-4861
Quinn Gelestino Quality Analyst qgelestino 240-436-4821
Rachel (Graybill) Gonzalez Quality Analyst rgonzalez 240-436-4847
Megan Karr Quality Analyst mkarr 240-436-4737
Dolora Kirakou Quality Analyst dkiriakou 240-436-4819 
Bryce Sigler Quality Analyst bsigler 240-436-4804
Ashley Taylor Quality Analyst ataylor 240-436-4863


Proficiency Sample Program (PSP)

Email for general proficiency sample help and questions. 

John Malusky Program Manager jmalusky 240-436-4825
Ryan LaQuay Laboratory & Testing Manager rlaquay 
John Ardinger Production Manager jardinger 240-436-4832
Andrew Jones  Engineering Technician  ajones 240-436-4834
Lynn Mills Engineering Technician 2 lmills 240-436-4833

Laboratory Assessment Program (LAP)

Email for general assessment help and questions. 
Email Michele Bronk for questions regarding scheduling your assessment.

Sonya Puterbaugh  Program Manager  sputerbaugh 240-436-4865
Michele Bronk   Associate Program Manager  mbronk  240-436-4846
Mike Wagner   Associate Program Manager 
mwagner 240-436-4854
Russell Dabbs  Senior Laboratory Assessor 2 rdabbs 240-436-4835
Amanda Moser Senior Laboratory Assessor 2 amoser 240-436-4843
John (Jack) Quinlan
Senior Laboratory Assessor jquinlan 240-436-4828
Nancy Byrd Laboratory Assessor 2 nbyrd 240-346-4867
Jacob Nance Laboratory Assessor 2 jnance 240-436-4848
Mary Kaye Sumner Laboratory Assessor 2
msumner 240-436-4829
James Wesselhoff Laboratory Assessor 2 jwesselhoff 240-436-4853
Tori Ahn Laboratory Assessor vahn 240-436-4849
Mariah Bowie  Laboratory Assessor mbowie 240-436-4831
Kiana Carr  Laboratory Assessor kcarr  240-436-4858
Jasmine Iler Laboratory Assessor jiler 240-436-4827
Vlad Kravchenko  Laboratory Assessor  vkravchenko 240-436-4817
Heather Price  Laboratory Assessor   hprice  240-436-4823 
Alyssa Roff Laboratory Assessor  aroff 240-436-4810 
Maiya Spell Laboratory Assessor  mspell  240-436-4813
Frankie Stevens Laboratory Assessor fstevens 240-436-4830

Independent Contractors

Email Phone
Melissa Angeles (858) 621-3583
Enrico B. Bado (240) 507-0152 
Chris Breth  (814) 215-7057 
Evan Price    
Dan Stegmaier (301) 760-8007

To reach an Independent Contractor whose contact information is not listed, please use our main contact information. 

Question/Topic  Person to Contact 
AASHTO re:source Website Troy Benedict, IT Manager or
Kim Swanson, Communications Manager
Newsletter Articles and Podcast Kim Swanson, Communications Manager
Customer Feedback Tracy Barnhart, Quality Manager or
applicable Program Manager
AASHTO Accreditation Program Your Quality Analyst or
Laboratory Assessment Program
Cost Estimate for Assessment and/or Accreditation Michele Bronk, Senior Laboratory Assessor
Scheduling Your Assessment  Michele Bronk, Senior Laboratory Assessor
Proficiency Sample Program 
On-site Inspections or Proficiency Samples
Cement and Concrete Reference Laboratory
FWD Program Russell Dabbs, Senior Laboratory Assessor
ISO/IEC 17025 Accreditation Tracy Barnhart, Quality Manager or
 Brian Johnson, AAP Manager
Laboratory Assessor