CHESTER LabNet (CLN) is a small laboratory that specializes in inorganic air quality analysis. Our staff is dedicated to the satisfaction of our clients, and responsive to the unique needs of the air quality industry. CLN has a great depth of knowledge of inorganic air quality methods and their nuances.
CLN was originally founded in 1977 as NEA, Inc. In 1991, the laboratory was sold to Chester Environmental and became part of the Chester LabNet laboratory network. CLN was later purchased by private investors and had been independent since 1994 until being acquired by Alliance Technical Group in 2023.
Key Personnel
Paul Duda – Laboratory Director, Client Services Technical Director, Lead Project Manager
Email: paul.duda@alliancetg.com
Hire Date: December 1989
Education: B.S. Engineering Management, University of Portland
Background: Gravimetric lab technician, XRF analyst, project manager, and LIMS administrator; promoted to President in 2001. Currently a member of the Air and Waste Management Association (A&WMA) and Source Evaluation Society (SES). Received PNWIS-A&WMA Lab Coat Award in 2012
Jillian Lamb – Project Manager, Sample Custodian
Email: jillian.lamb@alliancetg.com
Hire Date: August 2023
Education: B.S. Bioinformatics, Pacific University
Mike May – QA Officer, Conventional Chemistry Technical Director, Lead Analyst
Email: mike.may@alliancetg.com
Hire Date: August 2008 – November 2011, November 2017 – Present
Education: B.S., Biology, Portland State University
Background: Analysis of environmental and production samples. Quality Control/Quality Assurance including EPA CLP and NELAP. Currently a member of The NELAC Institute (TNI).
Richard Sarver – XRF Technical Director
Email: richard.sarver@alliancetg.com
Hire Date: November 1986
Education: A.A.S. Chemical Technology, Chemeketa Community College
Background: Source Sampling, XRF analyst.
Ted Perry – Gravimetric Laboratory Technical Director, XRF Analyst
Email: ted.perry@alliancetg.com
Hire Date: September 2015
B.S., Chemistry (Environmental Chemistry option), Oregon State University
Background: Environmental analyses of air, soil and water samples; Gravimetric Laboratory Technical Director.
Employee Hall of Fame
Sheri Heldstab – retired QA Officer and Conventional Chemistry Technical Director
Email: SheriLHeldstab@gmail.com
Retired: April 2022
Education: B.S. Biology, University of Oregon
Career Highlights: Sheri worked for CLN for 28 years where she ran the conventional chemistry lab and served as QA Officer. One of her biggest accomplishments was co-authoring the ASTM method (D7614-20) for hexavalent chromium in ambient air. Towards the end of her tenure at CLN, she was the Chair of the TNI SSAS Expert Committee and was the Editor of The Platform, the Source Evaluation Society’s quarterly newsletter. Sheri may not be working with us anymore but her legacy will will be felt for years to come.
Publications and Presentations:
PowerPoint for Cr VI presentation
PowerPoint for Source Emission Uncertainty presentation
The Laboratory: A Peek Inside the Black Box presentation
CARB 436: A Cautionary Tale of Methods, Math and Miscalculations
Photography: Human Nature Art
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