supply, laying, fitting , fixing and jointing of clear water rising mainfrom bs-i at bira to basirhat-ii glr at dhanyakuria of1422 mm ( od ) spirally welded ms pipe ( wall thickness 12.5 mm ) of approx. length 20km and 1200 mm dia di-k9 ( as per is 8329:2000 ) of approx. length 7.3km with all specials, valves, air valves etc including road, railway, canal crossing, applying trenchless technology as required and necessary shoring work, road restoration and protection work as per direction of e.i.c including trial run for 03 months and operation and maintenance scheme for 60 months for integrated surface water based w / s scheme for arsenic affected blocks of baduria, basirhat-i &ii, swarupnagar and deganga in the district of north 24 parganas under barasat arsenic division, phe dte.