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That shouldn't be an issue, but the small piece of slab between the 2 manholes probably won't work.

The vault extends 15' below grade with precast grease trap sitting inside. The slab in question sits on top of the vault and is even with the pavement. I can work on getting a sketch uploaded.

This may be the only viable solution, but we were hoping for something at lower cost/effort.

Also, I need to figure out of we can even get a 10' long beam in place through the manhole.

We considered that! The manhole is at a quarter point and the access inside is at the center, so no good there. Thanks for the idea though!

We have a precast slab which sits on a cast-in-place vault. A manhole (with appropriate reinforcement) is cast in the slab. I think it is precast just so it could be set in place so formwork didn't have to be built and removed out of a manhole. It is not prestressed. The slab with the following...