engagement of govt. of west bengal empaneled valuer under south 24 parganas water supply division-i, phe, dte. for settlement of final payment for the work surveying, design, construction, supply, laying, erection & commissioning of pumping main ( m.s., d.i. etc ) for conveyance of treated water from cwr ( at wtp ) to different block level glrs including construction of glrs, pump house, sub-station building, chlorine room and other related structures as required and pumping main for conveyance of treated water from different block level glrs to zonal ohrs and related electromechanical works including 03 months trial run and performance guarantee test followed by 12 months operation and maintenance for mega surface water based water supply scheme for falta-mathurapur, district: south 24 parganas. [ 2nd call ]