operation & maintenance of 2 (two) nos.airps (pressure type at teinpur z-i & teinpur z-iv wss) & 1 (one) no. airp (semi gravity type at teinpur z-iii wss) of differentcapacities located inkarimpur-ii block of nadia district under rws nadia sub-division under nadia division, phe dte. for the period of 6 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 supply the hard coke (size 40 mm x 32 mm) in coke tray aerator (payment to be made as per actual consumption shown in log book where coke tray is used). 11 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. 12 [ 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 & sl. no. 1.053]