August 31, 2026
This week’s photo is courtesy of Roscoe Moss Company- Los Angeles, CA
Safety Focus
Part 1 of 4: Housekeeping, Slips, Trips, and Falls: Why It Matters
In 2024, falls, slips, and trips in private construction put workers on the sidelines at a rate of 30.0 cases with at least one day away from work for every 10,000 full-time workers. That is well above the all-private-industry rate of 22.6. Across private industry, these same events caused 479,480 days-away cases, with a median of 13 days away from work per case.
Now the part that shapes this week. The falls that kill are almost always falls from height. In construction, 95.9 percent of fatal falls, slips, and trips in 2024 were falls to a lower level. That is why fall protection gets the attention it does, and it should. But the ground-level events, the slips, the trips, the same-level falls, are a different story. They rarely show up in the fatality reports, and they still pile up days away from work. In construction, same-level slips, trips, and falls ran 11.0 cases per 10,000 workers in 2024. Those are the injuries housekeeping is built to prevent.
Picture how it happens. A coiled hose, an electrical lead, a slick of mud or spilled fluid, loose material underfoot. None of it looks like a hazard until a boot catches or footing goes, and then it is a sprain, a wrenched shoulder, or an injured back. All of which could lead to weeks of light duty or lost time.
That is why housekeeping is a safety control, not just cleanup. Keeping walking and working surfaces clear, organized, and lit are the first steps in avoiding the incidents.
Here is our safety plan for the week. Tuesday, we spot the trip and slip hazards that blend into a busy site. Wednesday, we set a housekeeping standard for walking and working surfaces. Thursday, we make it stick, so a clean site is how the crew operates, not something you do when an inspector is coming.
Key Takeaways
• In 2024, private construction saw falls, slips, and trips at 30.0 days-away cases per 10,000 full-time workers, above the 22.6 all-private-industry rate.
• Across private industry, these events caused 479,480 days-away cases, a median of 13 days each.
• Fatal falls in construction are overwhelmingly falls from height (95.9 percent); the same-level slips and trips that rarely kill still drive lost time, and housekeeping is the control for them.
Sources:
Knowledge Share
Part 1 of 4: Aquifer Hydraulics and Math, Part 2: Why It Matters
Last week we introduced Darcy's Law and hydraulic conductivity, or K, the property that describes how readily water moves through the material. This week we build on it with four numbers that tell you how an aquifer responds and how a well performs: transmissivity, storativity, specific yield, and specific capacity. Three of them describe the aquifer. The fourth, specific capacity, describes one particular well on one particular test.
Here is why these numbers matter on the job. Pump sizing, the drawdown you expect, whether a new well will interfere with an old one, and the yield a well can hold under test all trace back to these numbers. Lean on good values and the design holds up. Lean on bad ones and you oversize a pump, set a yield the well cannot sustain, or draw down a neighbor.
A quick preview. Tuesday we define each term and put the two working formulas on the table, transmissivity and specific capacity, in a Formula Spotlight. Wednesday we estimate transmissivity and calculate specific capacity from a pumping test. Thursday we cover the traps: why specific capacity is not a fixed property of a well, and how well loss and partial penetration can make you read it wrong.
One framing to carry all week: K describes how well the material itself transmits water. Transmissivity takes that and adds how much saturated thickness you have to work with, so it describes the aquifer, not just one slice of it. A thin streak of excellent sand and a thick bed of ordinary sand can come out with about the same transmissivity, moving water about equally well. What the aquifer can transmit, and what it can give up from storage, is what these numbers pin down. The formation does not care which combination you have. It will tell you what it can do when you test it.
What this means for your next design: before you size anything, know which of these four numbers you actually have, and which you are only assuming.
Sources:
Recommended Print References:
• Handbook of Ground Water Development- Roscoe Moss Company
• Groundwater & Wells, Third Edition- Edited by Robert J. Sterrett, Johnson Screens
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