Gypsum Structural India emerges as L1 bidder for rehabilitation of sewerage system in Ludhiana, Punjab May 29, 2023 | Awarded, Key Segments, Municipal Wastewater, Project Updates, Wastewater Gypsum Structural India Private Limited emerged as lowest (L1) bidder for the rehabilitation of the existing trunk sewerage system at Punj Peer Road and PAU Road in Ludhiana, Punjab. This content is restricted.