The original use of pea stone is the problem. Round stone settles because it does not have a locking surface. Knowing the original GC screwed up doesn't help now. My reco.....since the pea stone has probably found equilibrium, lay thinset (with fiberglass mixed in) on top of the areas that have...
Obviously, cost estimates are subjective. To provide some objectiveness, I add to my cost estimate a paragraph descibing my assumptions. For example, Lump Sum-SWAG or RSMeans unit est #, etc. I then provide what I believe to be a percentage accuracy estimate (i.e- guess) based on these...
Each trade can have esoteric words. However, where I come from...shoring is used as in the excavation of a trench...to shore up the sides.
Lagging is used as in pipe insulatiopn...to lag the pipe with fiberglass insulation.
Others may have a different take?
Specifications for a single story warehouse foundation call for a PIP wall foundation (no change in footing) to a depth of 4' with #4 rebar lengthwise at 3' OC. The contractor has offered a reduced cost if concrete masonry unit (same thickness) is used. This appears to be OK for this application...
I'm not a civil, but a recent course taken for non-soils engineers suggested the use of geo-tech fabric to mitigate the problem. There are lots of sources for this info. At the prices received for this "tech" fabric, you'll get a lot of support.
Not an expert, but it would seem that...
