+1. as an engineer i've experience with many large earthwork projects and safety's #1 on my jobs. shoring's a good idea with your trench, especially with the spoils placed directly on the ledge (the mass of the spoils are contributing additional force that can add to the shearing of the face below them). the cost of a couple sheets of plywood and 2x4s are cheap when compared to having it cave in on you - both in safety and having to dig it all out again.
your project though, so whatever you decide to do, be safe!




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