tender for design, supply, transportation, construction, installation, testing, and commissioning of 1 no. of sewage treatment plants (stps) at north guwahati mb (1.0 mld) in activated sludge process (asp) on design, build, and operate (dbo) basis with sewage pumping station, nallah/drain outfall interceptor and diversion works, along with all associated civil, electrical, mechanical, piping, and instrumentation works, as well as operation and maintenance (o&m) of the complete system for a period of five (05) years after successful commissioning, and design, supply, transportation, construction, installation, testing and commissioning of community level soak pits at nallah/drain outfalls at palasbari mb under sbm(u) 2.0.