Boring Log A soil profile is shown in figure (1) along with the standard penetration numbers at each 1.5m. The numbers of blows required of three 150-mm intervals are recorded. Use united state safety hammer with E, =90 percent, the borehole diameter is 110 mm, the drill rod length is 8 m and the sample is without liner. The water table at 1.5 m. Calculate the measured SPT N values, N70, in depths (1.5 and 3 m). Soil description Depth (m) Soil sample type and number N 0 Y = 16.5 kN/m² "GWT 1 y= 19 kN/m³ You-19 kN/m ** Comments (%) 1.5 4,4,6 SS-1 8.2 5.5.6 SS-2 17.6 LL 38 P1-11 2,4,5 ST-1 20.4 LL-36 5 4.- 112 kN/m² 6,7,7 SS-3 20.6 7- Y=19.5 kN/m³ 7,8,9 SS-4 9