foundation engineering The site for a four story concrete building without basement was (50mx 75m). 1)How many boreholes required?(5Marks) 2)Find (Ncor)if the results of (SPT)at 9m depth for one of these boreholes were: Blow counts = 12/15/18(blow counts for first second and third 150mm increments).Soil profile :Uniform medium sand, dry unit weight =18kN/m3&Gs=2.60,water table at the ground surface. Let n 1 = hammer correction=0.8, diameter of hole =200mm and drilling without linear