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Using their parameters of 50 feet tall (I don’t think it would have to be that tall really), and 10 feet below ground...assuming a 12” thick panel, that’s 2.2 cy per foot. At $450/cy, that’s an even $1,000 per foot.

Then I’d add in a pier every 10 feet, 50 ft deep, 24” diameter, with an H column extending 60 feet. I’d guestimate each pier and column to be $6k...divided by 10 adds $600 per foot...so we’re up to $1,600.

Add 30% for design and layout: $2,080

Then add for being a government job...I’d say $2,400 isn’t that far off....and there is property acquisition added to that cost...seems like a reasonable total estimate (not just construction)

But, it doesn’t have to be 50 feet tall. More like 20 feet tall, likely cutting the cost in half.

So, by my guestimations, the construction cost for the 50 ft wall is $1,600/ft...but a much more sane 20 ft wall would have a construction cost of $800-$1000, ft.

I’m curious to know what your estimate would be, and if we’re even in the same ball park.