Our foundation is essentially a rectangle 25'1" by 47'4", with a diagonal of 53'6" (right?), as ably demonstrated here by the Derba Construction tape and drill team. Well, getting the foundation square and within 1/2" to meet the modulars isn't really the problem. Getting that rectangle in the right place on a site cleared of all references is the tricky part, and we screwed it up. In the absence of our surveyor, we taped it out from the street, figuring we'd be within 6" which is good enough for the footings.
Unfortunately, we took the 6" tolerance too far - the measurement was off 6", the marks were off 6", and the excavator was off 6". On a good day, some of those errors cancel. On a bad day, the error accumulates (on a really bad day, the error multiplies, but let's not go there). End result, the hole was in the wrong place. See that man at the far end? He's supposed to be in the middle of the hole.
The mistake cost us 2 days, plus we missed an ideal warm day to pour concrete. Our surveyor came by the next day and has given us proper references to work from.
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