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buoyancy reference: https://precast.org/wp-content/uploads/2022/08/NPCA-Buoyancy-White-Paper-2022.pdf Concrete canoes float

When was the farmhouse originally built? Maybe stone foundation was replaced with concrete in "sections" - butting up against stone... Just a thought. I agree - not shrinkage cracks!

What are conditions at the other end of the beam? Did a bearing wall get "removed"? I have seen remnants on residential "improvement" projects

references that Navy might have more current issues: https://www.publications.usace.army.mil/Portals/76/Publications/EngineerManuals/EM_1110-3-142.pdf?ver=T7WPD1eSXb0UkLQXm8m2JA%3d%3d...

did anyone see how the drywall was installed? Maybe the scissor lift operator hit the wrong lever.

a brick arch will be constructed different than shown in typical CAD details: http://www.gobrick.com/docs/default-source/read-research-documents/technicalnotes/31-brick-masonry-arches.pdf?sfvrsn=0

A few years ago I worked on a project that installed 5 debris barriers: https://www.geobrugg.com/en/Rockfall-protection-barriers-GBE-7953.html

cordless cut-off saw might work http://toolsinaction.com/milwaukee-cordless-cut-off-saw-review/ https://www.echo-usa.com/Products/Cut-Off-Saws?msclkid=6c7127f325c51142db7379b2853a156d

Brick Industry Association may have some insights: http://www.gobrick.com/searchresults?indexCatalogue=main&searchQuery=cause+of+cracks+in+masonry&wordsMode=0

CRSI reference: https://www.crsi.org/index.cfm/steel/identification

can you get a new slab precast with required dimensions and just swap slabs

Early in my career I had a wastewater treatment plant project that had significant issues with concrete placement and consolidation (some voids were through the entire wall). After arbitration, leaks were repaired with SIka products and an AWWA leakage test was performed...

some options mentioned by RHTPE can be reviewed: http://www.daytonsuperior.com/docs/default-source/handbooks/concreteformingaccessorieshb.pdf?sfvrsn=24f1d560_70

It may be fine now, but don't forget to seal off water (mmarlow suggestion) https://www.eng-tips.com/viewthread.cfm?qid=389528

Our treatment plant has 42-inch high guardrails near numerous handwheel operators, which creates "knuckle busters" conditions. You should check heights and layouts to avoid conflicts at your installation.

I have seen some of the angle fittings used in tight spaces https://www.unistrut.us/products/1-5-8-metal-framing/general-fittings/angular-fittings

Related to bones 206 suggestion, I have seen this product used: https://unistrut.us/products/seismic-support

is this in a zone subject to freezing? If it is, then are there any weep holes? (didn't look like any from this angle)

https://www.pavementinteractive.org/reference-desk/design/mix-design/aci-mix-design/ ACI has recommendations

here are some references to get you started: http://www.concretepipe.org/pipe-box-resources/design/design-data/ contact the precast concrete plant near your project to review your design conditions