Removal with uderwater blastings and extraction of the basements of the old bridge for the crossing the Arroyo Potrero Stream in the .Prov. Nº 1. Were drilled and blasted 140 piles of armed concrete and 2 armed stone of 13 mts lenght by flew for 4 mts. of wide and 6 mts. of height.. Customer: Marcalba S.A