Combined Interpretations of the 2003, 2009, and 2016 Standards that apply to Volume 1 of the 2016 TNI Standard
Question: We needed samples of drinking water to be tested for lead. I was disturbed to see a lab did not have a chain of custody form. I was concerned that there was an unsigned gap in the chain of custody when samples were delivered by FedEx courier to a lab nearby. The question is: isn't a complete continuous, signed Chain of Custody form required so the sample could be accounted for specifically by a signed individual? TNI Response: A complete, continuous Chain of Custody form is not required for samples, unless otherwise specified by the client. Note that 5.8 differentiates between sample handling and tracking and legal chain of custody protocols. 5.8 requires that a record keeping system allow historical reconstruction of all laboratory activities. A laboratory that does not record the receipt of samples by a specified individual is not compliant with this aspect of the standard.
MODULE 2: QUALITY SYSTEM GENERAL REQUIREMENTS
Section: 5.8.8

develop consensus standards for use by TNI's programs. This group has a support role in assisting other programs with activities such as guidance and standards interpretation.
fosters the generation of data of known and documented quality is through the National Environmental Laboratory Accreditation Program, or NELAP. The purpose of this program is to establish and implement a program for the accreditation of environmental laboratories.
is to establish and maintain a national PT program to support TNI’s National Environmental Laboratory Accreditation Program, and other activities.
Field Activities Program (NEFAP) Executive Committee is to establish and implement an accreditation program for field sampling and measurement organizations (FSMOs).
Audit Sample Program is to develop consensus standards for the manufacture and analysis of audit samples for source emission testing.
on a variety of topics of interest to the environmental measurement community. TNI also hosts two regularly scheduled meetings per year, typically in January and August. Both are a week long and involve open meetings of TNI committees as well as training courses and other special sessions.