tender for operation and maintenance of iep at chaumuha w-s scheme etc, operation & maintenance of iep at chaumuha w/s scheme at barasat-ii block, north 24 parganas under barasat arsenic division, phe dte. for the period of 01 (one) year. (sl no. 3) sl. no. item description 1 labour charges for operation & maintenance of iep by engaging 1 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 valveii) 100 mm dia pn10 5 provision for making payment towards labour wages in case of enhancement within the stipulated period of the said work to be in the following manner{[ enhancement of wages + 8.33% bonous + 10% contractors profit +5% overhead expenses + esi+epf.} 6 gst @18% on all the above items. 7 labour welfare cess @1% on all the above items.