yeah, I agree that hanging a 2x4 by 1.5" is getting iffy. But it
depends on what you are setting on it. A one story ranch in arizona
is probably fine, but a three story house in the cascade mountains is
probably not going to be fine.. I will say again that out of square
foundations are quite common. If you start hiring masons and expect
that they will get their slabs to within 1/8" of square, you're
dreaming. A lot of that is driven by cost. Did you pay for a Yugo or
did you pay for a BMW? . Time is money, and getting things right on
the nuts takes time. If the framers where forming the slab, they'd
take their time, because they would know from experience that a few
extra minutes getting started off on the right foot will be made up 10
times over when it comes time to frame on it. But masons, like most
subcontractors, develop tunnel vision and fail to see beyond their
part in a project.
What do you do about it? What is your involvement in the project?
are you serving as general or do you have a general? What kind of
building is it? Is it already too late? Houses can be built out of
square, and depending on the finish materials, noone will know but
maybe the sheetrockers. Or you could split the difference, hanging
plates less and allowing the house to be somewhat out of square. It
all depends on what you are building.
I have never seen a slab WITHOUT a birdbath or two. However, a 1"
deep puddle in 2 feet sounds pretty bad. Can you see it when it isn't
filled with water?