Tender For corrigendum : providing and laying of waterproofingtreatmentwork over roof of phi (3x105mw), phiii, phiv thp mppgcl, sirmour, deolond jhinna. - providing and laying of waterproofingtreatmentwork over roof of ph-i (3x105mw), ph-iii, & ph-iv thp mppgcl, sirmour, deolond & jhinna.