In one core run of 1500 mm selected from cores obtained during drilling for a bridge foundation in hard limestone, the following core recovery information was obtained: Determine
(a) The percent core recovery
(b) The RQD. Based on this RQD, what is the rock quality?
Core Recovery (mm)..................................Length of Core Pieces > 100mm
250...................................................... 150
50.......................................................
50.......................................................
75.......................................................
100......................................................100
125......................................................125
75.......................................................
100......................................................100
150......................................................150
100......................................................100
50.......................................................
125......................................................125
Sum = .......................................................Sum =