A structural column sits on a type G base plate anchored at the top of the foundation mat. The concrete column encasement surrounds the vertical structural member extending upward from the base plate. Elevation markers denote Level B1 at minus 17 feet zero inches and the top of the foundation mat at minus 20 feet zero inches.
LEVEL B1 -17'-0" T.O. MAT -20'-0" CONC COL ENCASEMENT TYPE G BASE PL
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