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Old Posted Apr 15, 2016, 12:51 AM
scraperwill scraperwill is offline
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Join Date: Jun 2014
Location: Austin, TX
Posts: 24
Looks like a "mud slab." Because the excavation terminates in this highly expansive shale soil, they immediately cap it with 3 to 4 inches of low strength concrete to protect it from the elements during construction. Otherwise the shale could swell tremendously. They just penetrate the mudslab with the foundation. I'm sure they are at the bottom here.
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