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Bob Libra
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A couple oldies. One cell of a three-stage sewage lagoon planned to serve a small NE Iowa town. The cell was cut to with 5 feet of the Ordovician Galena Limestone, a quite karst-prone rock strata. A fair amount of overlying glacial till and loess were stripped to bring it to grade. The unconsolidated cover masked any obvious karst like sinkholes in the immediate area.
As the system was close to completion the area had big rain and the town directed storm water to one of the cells to check 'er out. That was on a Friday; by Monday they saw the lagoon had drained into a small sink with rock visible. Ponding water even on compacted glacial soils still may cause sloughing of the sediment into underlying voids. A huge amount of $$ went down that drain.
That's me in the middle of the lagoon 35 yrs ago, and my boot at the hole. The boot and hole picture, I'm told, is the most famous picture of me around. And some say it's the only one to catch my good side ;).
I'm doing a bit of work on a similar situation now. Hopefully we won't have to relearn this lesson!
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11/22/17
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It was 42 yrs ago today the Edmund Fitzgerald and its entire crew sank in Lake Superior. The Fitz' had left the docks in Superior WI the day before; Superior shares the harbor on the west tip of the lake with Duluth MN. I was in college on my home turf in Superior then.
One of the things I remember about the night she went down was the TV stations in Duluth-Superior breaking in with a call for the crew of the Cutter Woodrush to report. It was the only Coast Guard vessel on the Lake - and was almost the whole lake away from the sinking. It went to the site full throttle but too late.
The Woodrush had a bit of a history beyond the last (so far) Great Lakes shipping loss. It went to Alaska, was involved in a major cruise ship rescue off the British Columbia coast, and was a first responder to the Exxon Valdez mess.
The boat was decommissioned in 2001 but is still on the job; it was sold to the Ghana Navy. So at least in it's 70's it's a warm retirement place and doesn't have to break ice anymore ;)
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It's not just DC - the R's have a Little Swamp on the Prairie here in the cornfields as well.
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A blog on the soft shaky sediments below Mexico City. and where things collapsed.

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Random geo-photo: the contact between crystalline Precambrian ore rocks and the overlying Cambrian Deadwood Sandstone at Homestake gold mine in Lead South Dakota. Homestake is an open pit and underground mines to 8000 ft below the surface. By the end of it's day, they'd found 55 billion reason$ for the mining.
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While the Gulf Coast floods, the West is Burning.
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Eclipse Day in Iowa - Safe viewing gear is locked and loaded!
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A bit of a historical perspective on two long-held American concepts that often butt heads: Free Speech vs. “Thou Shalt not yell FIRE in a Crowded Theater”. This has been on my mind because of Charlottesville of course. Forty years ago a neo-Nazi group wanted to march in Skokie IL, a Chicago burb with a large Jewish population. That bastion of free speech, the ACLU (which many conservatives love to Bigly hate) supported it as free speech. Many of their supporters denounced them for it.
I like to say ACLU's motto is "we defend the right to free speech no matter how much it sucks".
I’m not sure how to compare Charlottesville to Skokie 40 years ago. When it comes to the Free Speech vs FIRE question, there is a lot more gasoline in the theater these days. And the way some theater-goers yell FIRE has gotten hotter. This is not a small thing.
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Trump usually replies to criticism quickly. Has he replied to David Duke, who was reminding him to behave? Not that I have seen. If it bothered Trump, he would have called out Duke and told him what a pathetic loser he was. He doesn't seem to be shy about doing that. But apparently not this time.....

"So, after decades of White Americans being targeted for discriminated & anti-White hatred, we come together as a people, and you attack us? https://t.co/Rkfs7O2Ykr
— David Duke (@DrDavidDuke) August 12, 2017

I would recommend you take a good look in the mirror & remember it was White Americans who put you in the presidency, not radical leftists. https://t.co/Rkfs7O2Ykr
— David Duke (@DrDavidDuke) August 12, 2017

White Americans are so afraid to speak out that we've allowed our country to be invaded and our children to be propagandized by marxists. https://t.co/Rkfs7O2Ykr
— David Duke (@DrDavidDuke) August 12, 2017"
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