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Typically building departments send inspectors out to ensure compliance, unless the engineer is retained by the homeowner separately. Obviously countries differ on this I’m sure. Most home owners are too cheap to spring for paying an engineer to do site visits.

That and in some countries/states only Professional Engineers can be board members of the business. Also likely an ethics violation on top.

while having done similar work to this concept, the existing truss connection and the span seems like this could be problematic and then throwing valleys into the mix. What’s the snow load like and what’s the footing size for the columns?

What is it you expect to see from a site visit prior to any excavation? Short of doing soil borings or test pits walking the site would not yield much information beyond blatant fill material or swampy ground. Best off looking at historical aerial images and wetland or soil maps to see what you...

Check design guide 39 AISC I think that would really depend on the weld type

I wouldn’t call it pavement, it’s subgrade, unless the soil is over saturated what would be the purpose of drying it out? Settlement concern would mean you failed to reach compaction prior. The frost heave concern would be a result of using incorrect material for the area, non frost susceptible...

AASHTO Structural Supports for Highway Signs, Luminaires and Traffic Signals Or ASCE 7 maybe

What is the purpose of this? Why not just let gravity do the work? If you need variable flow rates use a vfd. So far this sounds like a really bad idea and not fully developed or understood

Typically my review consists of verifying calculations are correct, references provided and confirm the assumptions are correct and codes correctly applied. Plan review consists of review for constructability, match the calculations and sufficient details provided QC isn’t the issue, it’s a...

Shouldn’t a good sealer or epoxy floor coating provide protection?

I’d be more worried about the pretty drawings you bought than that footing. Do you have a frost depth or is that not a concern. Really should have a competent person review your building prior to building. It’s cheaper to do it right once that do a bunch of repairs. Just because building codes...

Did you have actual plans?

How long is the wall, how thick is and how reinforced is it? And most importantly how cheap is the home owner.

I would limit it to the inside face of the block, the distribution would still likely be 45 but as you say it’s are is limited due to the depth. But I don’t agree with the load distribution for the lintel since the block thickness isn’t great enough and the load isn’t centered. A high likelihood...

Construction joint like precast uses

What does your truss look like? Maybe there’s an alternative method of connection. Could a gusset plate connection work better?

Are you running a frost wall? What depth are you running in your grade beam?

When solid it wouldn’t really have lateral load but there would be residual load as a result of the direct placement of the fill behind the wall, unless you pour the retaining wall afterwards.

Draw a free body diagram of your moment frame and share. You should always do a simple hand sketch when trying to figure things out and not be completely reliant on computer programs.

During placement: Short lifts, bracing, or deadman tie backs. Post placement it should have really minimal with unconfined strength since it is solid depending on how far back you go with it.