Topographic Survey Comparison of Strategic Quarry Sites in Ilocos Sur

Abstract

The study aimed to compare the topographic survey conducted in Phase I and proved assumption that river bank depression occurs during the quarrying operations. The data obtained in the survey were compared with those of the available data in Phase I. The volume was computed through the average-end-area method. Only three (3) among the four (4) quarry sites of the first phase was considered namely: Namruangan, Cabugao; Paing, Bantay, and Bio, Tagudin, Ilocos Sur.. Libtong Tagudin, Ilocos Sur was not considered because quarrying has been stopped. The volume quarried in Phase I was noted to be negligible. It was found out that for the span of one year, the volume hauled at the quarry sites were 28,395 cu. meter; 634 cu. meter, 2,068 cu. meter for Namruangan, Cabugao, Paing, Bantay and Bio, Tagudin, Ilocos Sur respectively. It was observed that there is a decrease in elevation of the water line ofthe river in Paing and Bio quarry sites and there is a shifting of water line to 40 meters south in both
quarry sites mentioned. Replacement ofextracted aggregates really occurs as proven by the additional 248 cu. meters volume filled in Bio, Tagudin, Ilocos Sur. But there was depression created during the extraction operation and many were not filled up completely.