operation & maintenance of 2 (two) nos.airps (gravity type at bhander khola & kulgachi water supply scheme ) and 1 (one) no. airp (pressure type at sonda z-i wss) of different capacities located inkrishnagar-i block of nadia district under krishnagar sub-division under nadia division, phe dte. for the period of 06 months=182 days.- 1 daily operation of airp through engagement of an airp operator. 2 engagement of a technical person to manage onsite activities to ensure smooth operation and maintenance of the airp including daily water quality checking etc. (note :- 1 no. technical supervisor is provided for maintenance of 2 nos. airp). 3 regular maintenance of airp inclusive of all necessary manpower, accessories and cosumables (except chemical). 4 (i) civil 5 (ii) mechanical 6 collection of raw water & treated water sample for chemical & bacteriological testing of different parameters periodically as per normsof phe dte. carrying to designated phe / phe approved ngo laboratories and submission of report to the eic at regular intervalby the contractor at his cost during the o & m period. 7 supply of chemical dosing materials of best quality approved by eic. 8 supply & delivery ofcalcium hypochlorite ca(ocl)2 tablets / granules with minimum 60% to 65% chlorine content and tablets / granules should be packed in the plastic bottle (weighing 3 kgs each).[note :- test certificate mentioning the percentage of chlorine & batch no. / year of manufacturing to be submitted during delivery. rate of consumption may vary as per site condition.] 9 ferric chloride anhydrous (70% purity). [note :- test certificate mentioning the percentage of chlorine & batch no. / year of manufacturing to be submitted during delivery. rate of consumption may vary as per site condition.] 10 additional amount if required, in case of enhancement of rate if any of valve operator / pump operator etc. as per go circulated time to time by the department within this period as per direction of eic. [against item no.1] 11 [ note :- (i) gst @ 18% included in sl. no. 1.01 to sl. no. 1.06 i.e in all items; (ii) cess @1% in all items excluding in sl no. 1.051 & sl. no. 1.052]