operation & maintenance of iep at puturia w / s scheme of barasat - iiblock, north 24 parganas under barasat arsenic division, phe dte. { for1 ( one ) year w.e.f.01.09.2022 to 31.08.2023. } ( sl no. 7 ) 1 labour charges for operation & maintenance of iep by engaging 2 nos. operators for operating different valves and switches including back washing of filter media to maintain smooth supply of water throughout the day as and when the time will be fixed by the eic all complete as per instruction of eic. 2 sundries & petty repair including periodical charges of engine / gear oil and rubber bag for doser etc. as required as per direction of eic. 3 collecting sample of water for bacteriological and chemical test from any depth at any time during execution of work including hire and labour charges for tools and plants and sterilising the equipments, paying all charges and fees, testing etc. complete in all respect as per direction. 4 supply of d.i.d.f. butterfly valve 5 i ) 80 mm dia pn10 6 ii ) 100 mm dia pn10 7 any other necessary items as per prevailling current pwd & phe approved schedule of rates of kolkata / north & south 24 parganas / new town w / s circle / area of kalyani sub-division ( building & plumbing ) w.e.f 01.11.2017 & latest modefied corrigendum, thereof and approved schedule of phe dte. will be applicable. 8 gst @18% on all the above items. 9 labour welfare cess @1% on all the above items.