Using Figure $3\mathrm{.}29,$ classify the soils between depths of $66$ and $80$ ft in the CPT results pre$-$ sented in Figure $3\mathrm{.}28.$ Why are there spikes in the q$,,$ f$,,$ and R; curves between depths of $76$ and $78$ ft$?$ Please explaiun how to read the graph using lines because I am not getting the right answers$3\mathrm{.}9$ In Situ Testing

$99$