Three point scoop

[anomad]

If you are looking for something to dig out the ground for the curbing, like was suggested a single "bottom plow" like farmers plow and turn over there field could work, or maybe a "potato plow" kinda like a wide sub-soiler ...

My suggestion would be to not have the concrete any more than an inch higher than the ground, less is better ...

I used my loader bucket for a little ditch ...

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Then drove my tires up it to even it out ...

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The next year, I re-did it with the backhoe ... Even had a "inspector" go down and check it out!

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Always good to get a cat scan of your finished work.

I get a lot of lab inspections... LOL

 

[Cdash]

I've used single shank subsoiler to loosen dirt for manual removal with a shovel. Getting a nice straight and narrow line was tough. It was straight enough to bury 4" PVC but I guess it would be too sloppy for your application.

Something with a cross section you describe doesn't sound like it would hold up very long here where we get freezing and thawing. Have you calculated the concrete? An 80# bag of concrete has about 0.6CF and with a 4" wide x 4" tall curb would do less than 6" of length.

I think you missed something.....

4" x 4" = 0.11 sft

0.6 cft ÷ 0.11 sft = 5.5' long.

I think op said 80' total, so it would be about 16 bags, accounting for waste.