Answer / s p sharma

Black cotton - < 10t/sqm
normal soil - 10 to 20t/sqm
rock - more than 30t/sqm

Answer / shyam.bh

BC for different stratas as follows,
clay or black cotton soil = 20 mt/sqm,
soft rock = 20 - 90 mt/sqm,
hard rock = > 210 mt/sqm

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