Geotechnical Engineering Report 12 10 2024 submission

SUBSURFACE EXPLORATION PROCEDURE: STANDARD PENETRATION TESTING (SPT) ASTM D 1586 Split-Barrel Sampling Standard Penetra on Tes ng, or SPT, is the most frequently used subsurface explora on test performed worldwide. This test provides samples for iden fica on purposes, as well as a measure of penetra on resistance, or N-value. The N-Value, or blow counts, when corrected and correlated, can approximate engineering proper es of soils used for geotechnical design and engineering purposes. SPT Procedure: • Involves driving a hollow tube (split-spoon) into the ground by dropping a 140-lb hammer a height of 30-inches at desired depth • Recording the number of hammer blows required to drive split-spoon a distance of 18-24 inches (in 3 or 4 Increments of 6 inches each) • Auger is advanced* and an addi onal SPT is per- formed • One SPT typically performed for every two to five feet. An approximate 1.5 inch diameter soil sam- ple is recovered. *Drilling Methods May Vary— The predominant drilling methods used for SPT are open hole fluid rotary drilling and hollow-stem auger drilling.