This is impressive, but just one meter of dirt covering the surface of the earth is about 1.2 million trillion tons. 30 trillion tons would create a layer about 0.03mm thick. Invisible in a geologic sense.
Here http://www.bluebulbprojects.com/MeasureOfThings/results.php?...
That says there are 148 trillion square meters of land area on earth. So the technosphere (at 30 trillion tons) is about 1/5ton per square meter, or about 200 kg. If you use the all of the Earth's surface, it's 510 trillion square meters, so about 1/17th of a ton per square meter, or about 58 kg per square meter.