surveying, design, construction, supply, laying, erection & commissioning of 1 ( one ) clear water reservoir and 1 ( one ) ground level reservoir, pumping main ( m.s., d.i. etc. ) for conveyance of treated water to 29 ( twenty nine ) nos. ohr sites ( old and new ) including construction of pump houses, sub-station buildings, chlorine and chlorinetonner rooms, 16 ( sixteen ) nos new ohrs of different capacities, boundary wall, land development, pathway, arboriculture, distribution system ( m.s. d.i. / upvc / hdpe pipes etc. ) in all the 29 ( twenty nine ) distribution zones including providing functional household tap connections ( fhtc ) to all the rural households and public institutions ( e.g. schools, awc, health centers etc. ) , pipe carrying bridges & pipe carrying supportsand other related structure, restoration of roads to its original condition as required and related electro-mechanical, instrumentation and supervisory control and data acquisition system ( scada ) as per scope of works including 03 ( three ) months trial run and 72 hrs performance guarantee test followed by 60 ( sixty ) months operation and maintenance ( o&m ) for augmentation of surface water based water supply scheme for arsenic affected areas of budge budge-ii, bishnupur-ii and part of budge budge-i ( mayapur gp only ) blocks in the district of south 24 parganas. ( 2nd call )