1.0 Source 1 Hydrometer with no sieve 10 16.2479 percent minus #200 from wash = (sample weight - after-wash weight)/sample weight*100 percent minus #200 from wash = (11.94 - 10.00)/11.94*100 = 16.25 14.81 USCS Particle Size Distribution Report Material Description PERCENT FINER PERCENT COARSER GRAIN SIZE - mm.