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#30 The Duplicate
Manage episode 484368989 series 3553693
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Gunnar claims almost all duplicates we take serve close to no purpose. If you want to know why, have a listen and be entertained and informed at the same time.
The OGs are back together in this episode, and quite an unusual one it is. This times it is James who goes on a few rants, quite to Gunnar's amusement. Of course, Gunnar has a few things to say as well and he will definitively ruffle some feathers with this episode.
We start off with playing Wikileaks by talking about a letter the EPA sent to all auditors regarding the staged introduction of V3 of the PFAS National Environmental Management Plan (NEMP) and also a clarification regarding PFAS and the Duty to Report. (Plug to our previous Episode #25 The Duty to Report).
Then Gunnar and James hash out some ideas on duplicates, high RPDs, re-running of samples, basic statistics, experimental setups in science and why being 'conservative' might not be delivering the results you think it is.
Episodes we talk about:
#29 The OCSE Odyssey with Linda Apthorpe
#25 The Duty to Report with Elizabeth Wild.
#11 The Sampling Evolution with Ross McFarland
Links:
This episode was recorded on 17 May 2025
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The necessary disclaimer: The views, thoughts, and opinions expressed in this Podcast are the speakers’ own. They do not necessarily represent the views, thoughts, and opinions of 4Pillars Environmental Consulting Pty Ltd or any Client, Supplier or other party related to 4Pillars or the speakers.
(c) Gunnar Haid and James Hammond
Chapters
1. Intro (00:00:00)
2. NEMP V3 Rollout and Duty to Report PFAS (00:05:53)
3. EPA please update everybody (00:08:56)
4. Preparation for this episode (00:12:09)
5. Introduction into duplicates (00:13:20)
6. Duplicates: What and Why? (00:15:12)
7. Counting marbles (00:17:49)
8. The usual contaminants in soils (00:22:00)
9. Identical jars using AS 4482? (00:24:29)
10. Sample Transport issues (00:28:57)
11. Relative Percentage Differences (RPD) (00:30:35)
12. Quality Theatre (00:31:32)
13. We really researched that subject (00:34:35)
14. Large differences between duplicate samples. Now what? (00:37:04)
15. Gunnar's quest (bugged everybody for answers) (00:44:46)
16. Side step into sample re-runs (00:46:21)
17. Intra sample variability (00:55:44)
18. Deana Crumbling to the rescue (00:58:08)
19. Being 'conservative' is dangerous (01:04:53)
20. What can be done? (01:10:06)
21. Water samples? (01:13:56)
22. Bye (01:18:24)
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