September 25, 2026
This week’s photo is courtesy of- K.P. Ventures Drilling and Pump - Camp Verde, AZ, USA.
Health Focus
Part 1 of 2: Your Brain
Most of your body can operate on decreased oxygen. Your brain cannot, and it fails in a cruel order. A Department of Energy bulletin lays out the progression. At 19 percent oxygen there are adverse effects you will not notice. At 16 percent, thinking and attention are impaired and coordination drops. At 14 percent, judgment is poor. Loss of consciousness does not come until below 10 percent. Long before you go down, you have stopped being the person who should decide anything.
That is the mechanism behind the number we opened the week with. Between a fifth and a third of confined space deaths are people attempting a rescue, and much of the reason is that the second man is not thinking clearly either. He is breathing the same air the moment he leans over the opening.
OSHA calls an atmosphere oxygen deficient below 19.5 percent. Normal air is about 21 percent. Thin margin, and the early symptoms are ones a worker pushes through: headache, feeling off, moving slow, getting clumsy with your hands. Some people feel good, which is the cruelest part of it.
Then there is hydrogen sulfide, the gas behind more confined space inhalation deaths than any other.
H2S smells like rotten eggs at very low concentrations. OSHA's exposure table notes that above 30 parts per million the odor stops smelling foul and is described as sweet. Then it quits altogether: at 100 ppm, loss of smell sets in within 2 to 15 minutes, and 100 ppm is what NIOSH calls immediately dangerous to life or health. A sweet smell in a vault is worse news than a foul one. No smell at all is worse still.
At 700 to 1,000 parts per million, NIOSH documents rapid unconsciousness, breathing stopping, and death. OSHA notes that this knockdown effect frequently causes falls, which is how a gas call becomes a trauma call.
Carbon monoxide gives even less. Colorless, odorless, no warning.
What to watch for, in yourself and the person next to you: headache, dizziness, nausea, confusion, thick speech, stumbling, fumbling with tools, an unexplained good mood. Under 1926.1209 the attendant must stay aware of those effects and order evacuation the moment they show.
Tomorrow: what to do about it.
Key Takeaways
• Judgment fails before consciousness does. That is why rescuers become victims.
• Oxygen below 19.5 percent is deficient, and normal air is about 21 percent, so the margin is thin.
• Hydrogen sulfide causes olfactory fatigue around 100 ppm, the same level NIOSH calls immediately dangerous to life or health. Losing the smell means it got worse, not better.
• Carbon monoxide has no odor and gives no warning of any kind.
Sources:
• OSHA: Hydrogen Sulfide, Hazards
• U.S. Bureau of Labor Statistics: Fatal Occupational Injuries Involving Confined Spaces
• U.S. Department of Energy: Oxygen Deficient Atmosphere Hazards at DOE Facilities (Operating Experience Level 3)
The Week in Review
Five lines from the Safety Focus and five from the Knowledge Share. Each one is a single sentence you could write in a notebook and say out loud to a helper without looking. That is the test: if you cannot explain it in a sentence, you do not have it yet.
Safety Focus: Confined Space Entry
• A confined space is any space big enough to get into, hard to get in and out of, and not built for anyone to stay in.
• If it has or could have a bad atmosphere, could engulf you, could trap you, or holds any other recognized serious hazard, it is a permit-required space.
• Test for oxygen first, then combustible gas, then toxic gas, because the combustible sensor needs oxygen to read true.
• Forced air ventilation controls a hazard, it does not eliminate it, and PPE is never a control.
• Non-entry rescue is the default, which is why the harness and the retrieval line go on before the man goes down.
Knowledge Share: Pump Test Interpretation, Part 1
• A pumping test is a controlled experiment: a known rate in, a measured response out.
• A step test tells you about the well. A constant-rate test tells you about the aquifer.
• You cannot get a defensible storativity without an observation well at a known distance.
• Measure water levels before the test so you know what the aquifer was doing without you.
• Aquifer properties from a test describe the volume of aquifer the cone of depression actually reached, and no more.
Keep a running notebook. Writing it down on paper helps you hold onto it.
Sources:
• Frontiers in Behavioral Neuroscience: Paper Notebooks vs. Mobile Devices: Brain Activation Differences During Memory Retrieval (Umejima et al., 2021)
New Vendor Highlights
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Work Hard. Work Smart. Stay Safe!
