SILAPATHAR, Oct 17 – For the mega projects of Dhemaji and North Lakhimpur districts, boulders are being collected from the river beds of Likabali, Siji, Garo, Padi and Ego in West Siang district of Arunachal Pradesh for construction works. The people of West Siang feel that largescale collection of boulders from hilly areas is responsible for the devastation in the lower reaches of the river beds. The public expressed this before a joint team of Dhemaji district administration and journalists which visited West Siang district of Arunachal Pradesh for geographical study of the Gai river.