Mr Silverstein also complained that the slurry wall, which was to remain exposed, was simply ugly.
Today, the Slurry Wall is one of the most haunting features of the World Trade Center Memorial Museum.
Make concealment and revelation work together symbolically, with the slurry wall as witness.
The bathtub was the 9-block area of the World Trade Center site at bedrock, that was protected by the slurry wall.
There is serious cause for alarm, however, in the treatment of the slurry wall in the revised version of the plan.
The police officer said that, on the first occasion, a fingertip search was carried out and even the slurry tip was searched.
The slurry gushed with such force it buckled a quarter-inch thick metal plate and would have trapped Mr Whipps, the inquest was told.
As visitors descend underground into the museum, they'll see the slurry wall, the bedrock that held back the Hudson River when the towers collapsed.
It was believed Mr Whipps, 27, had removed bolts from a problematic valve, causing the slurry to gush out, trapping him on 15 July 2011.
Halliburton then conducted another test using a modified procedure, the letter said, and the result for the first time indicated the slurry design would be stable.
Paul Gray, 50, disappeared when he climbed over a wall and into the pit after Craig Whipps became submerged in the slurry at Albyns Farm, near Ongar.
Nevin went in after him and he too became overcome by the slurry fumes before their 58-year-old father Noel went down the ladder and also lost consciousness.
BBC: Spence family slurry deaths: Inquest hears tragic details
The inquest was told fumes, including hydrogen sulphide, would have been emitted in such vast quantities with the slurry that anyone in its path would have collapsed almost immediately.
The inquest heard that nuts, bolts and a ratchet spanner were later found in the slurry and on the balance of probability it was believed Mr Whipps had tried to solve the valve problem.
However, the letter said investigators were unsure if that fourth test was completed before the cement slurry was poured at the Macondo well, and that Halliburton reported the positive result to BP after the blowout.
Washington (CNN) -- Oil giant BP and contractor Halliburton knew of potential flaws in the cement slurry used to reinforce the oil well below the Deepwater Horizon rig before it exploded in April, according to a letter Thursday from the lead investigator for a federal probe of the Gulf oil disaster.
"Halliburton (and perhaps BP) should have considered redesigning the foam slurry before pumping it at the Macondo well, " the letter continued.
Making marinades is messy, but after you've portioned out the fascinating-smelling slurry into heavy-duty gallon zipper storage bags and thrown them smugly into the freezer, you're done.
Yet noble intentions do not, of themselves, move concrete, even rotting concrete like the cement-and-pine-cone slurry used to make the Elwha Dam, the first of the two structures to be built.
Subsequent testing showed that the cement such a slurry produced would have been likely to break down.
As part of the investigation, the letter said, Chevron conducted independent tests of similar cement slurry materials supplied by Halliburton and found the mix to be unstable.
The miner had swallowed pit slurry and it is understood he collapsed before being taken to Morriston hospital.
Two farm workers died when one tried to help the other out of a slurry pit in Essex, an inquest has heard.
Visionaries see a future in which things like household rubbish and pig slurry will provide the fuel for cars and homes, doing away with the need for dirty fossil fuels.
It is the source of almost 4% of the world's greenhouse gases, mostly in the form of methane from rotting food and that does not include all the methane generated by animal slurry and other farm waste.
"Halliburton and BP both had results in March showing that a very similar foam slurry design to the one actually pumped at the Macondo well would be unstable, but neither acted upon that data, " the letter said.
That information revealed the two February tests by Halliburton of a slightly different cement slurry mix that showed it was unstable, the letter said.
Treatment continues at the sites today, with vapor barriers in place, so-called slurry walls going down 40 feet into the earth, well sucking up water to be treated, and systems operating to extract toxins from the air and water.
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The letter from Fred Bartlit Jr. to the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling said that tests in February on a cement slurry similar to what was used on the Macondo well showed instability -- and that both companies had the data.
More time is then left to devote to his income-generating greenhouse, which uses waste slurry left over from the biogas digester as fertilizer for his grapes, strawberries, apples, plums, cherries, peaches, eggplant, cucumber, tomatoes and squash.
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