Back in the 80's there was a project next to a freeway that the firm I worked for was building. It was run by a different Project Manager. but I went by the site a number of time to observe. They were building an office park in a canyon at the bottom of a 150' high slope, and condos at the top. They would run scrapers up a winding haul road to the top and the scrapers would go over the edge of the slope that was almost as steep as the one shown. The front end of the scraper would be suspended in the air while the rear engine pushed it over the side (637 twin engine cats). The operator would drop the pan and would slide straight down the slope with material boiling over the sides of the pan and the rear wheels completely off the ground.
When they got to the bottom they had to time it just right and make a turn or the front end would impact the flat area and get stuck.
I don't know where they got operators with enough brass to do this, but it went on for weeks!
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Condos are the upside down "L" buildings and office park is at 8 o'clock position. The condos literally hung over the edge of the slope and were anchored back to a huge concrete dead man with 2" stainless steel cables.
It was quite a project.