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For future reference, in almost all stone I have ever used, you can count on about 15 sq ft of wall for one man rock, 12 sq ft for two man and 9 sq ft for three man. It is not 100% accurate, but I have found it to be good enough for bidding on projects.
As far as being over on materials, only you know your client well enough to judge whether you could ask for more money or not. The one time I ended up way over on material costs for a wall, it happened to be in a large enough project that I could absorb the loss elsewhere...
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...he said with a sawdusty sneeze, "I am the Lorax. I speak for the trees. I speak for the trees, for the trees have no tongues. And I'm asking you, sir, at the top of my lungs--"
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