outsourcing of operation and maintenance of pdfac system consists of plc, switch gear panels, modules, breakers, fly ash conveying, instrument compressors, intermediate conveying and instrument compressors and auxiliaries, pdfacs equipments in esp area, intermediate silo, cooling tower and fly ash pipelines to a length of 1500mtrs from espnctps -i to 1000mt silo top located at nctps –stage ii including structural supports, silo top target box, vent bog filter system, silo top unloading chutes, loading the fly ash vehicles round the clock and 100mt weigh bridge and auxiliaries, cleaning of silo area and silo approach road for a period of 60 days or until completion of quantity ( 58000mt ) whichever is earlier.