About Us

CHESTER LabNet (CLN) is a NELAP accredited 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 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 has been independent since 1994. In 2016, the company became 100% employee-owned. As both owners and employees, we are highly committed to great customer service.

Key Personnel

Paul DudaPaul Duda – President, Laboratory Manager and Lead Project Manager

Email: pduda@chesterlab.net

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). Received PNWIS-A&WMA Lab Coat Award in 2012


Lisa BallLisa Ball – Project Manager, Sample Custodian

Email: lball@chesterlab.net

Hire Date: October 1997

Education: B.S. Integrated Science, Portland State University

Background: Environmental analyses of air, soil and water samples; project manager and sample custodian.


Richard SarverRichard Sarver – XRF Technical Director

Email: rsarver@chesterlab.net

Hire Date: November 1986

Education: A.A.S. Chemical Technology, Chemeketa, Community College

Background: Source Sampling, XRF analyst.


Sheri HeldstabSheri Heldstab – Conventional Chemistry Technical Director and QA/QC Officer

Email: sheldstab@chesterlab.net

Hire Date: July 1992

Education: B.S. Biology, University of Oregon

Background:  Environmental analyses of air, soil and water samples; technical writing; health and safety oversight; Quality Control/Quality Assurance including EPA CLP and NELAP. Currently a member of the American Chemical Society (ACS) and The NELAC Institute (TNI).


Jennifer SchleisJennifer Schleis – Gravimetric Lab Technical Director and Chemist

Email: jschleis@chesterlab.net

Hire Date: February 2007

Education: B.S.E.S. Environmental Economics and Management, University of Georgia

Background: Environmental analyses of air, soil and water samples; Gravimetric Lab technical director.


Photography: Human Nature Art