REPAIR, MAINT AND SERVICING OF PACKAGE TYPE FILTERATION PLANT AND CONNECTED ASSETS AT AF STN DIGARU.

Removal of existing old gravel and sand from Auto valve gravity filter at New filtration plant , HQ area and deposting the old gravel and sand at a distance not exceeding 50 meter and cleaning filter chamber and wall surface throughly etc complete all as specified and directed.

Supply and filling of filter media using graded gravel of same size as existing including washing ,drying and screening to meet product and particle size specifications and stringent requirement for the filtration of water complete all as specified and directed.

Supply and filling of filter media using silica filteration sand same as existing size to meet product and particle size specifications and stringent requirement for the filtration of water complete all as specified and directed.

M & L of collection of 01 No raw water sample from river side and 01 No treated water from High lift Pump house & 01 No HQ Pump House and carrying out physical, chemical and bacteriological testing ( Test, Odour, Turbidity, PH Value, TDS, iron, Chloride, Calcium, Sulphate, Sulphide, Nitrate, Nitrite, Manganese, Zinc, total Hardness, cadmium, Nickel, Total Plate Count, Coliform bacteria, Escherichia coli and Pseudomonas aeruginosa) of water sample from approved NABL Accredited laboratory complete all as specified and directed.

Supply of Sodium Hypochlorite Solution available chlorine percent by mass by volume (as CI) : 10% packing in 35Kg/50Kg/100 Kg plastic recycled jars, availability of test report from a laboratory/study/centre of any state university( a university established or incorporated by a provincial act or by a stateAct) OEM must possess the following valid certificate FSSAI,ISO 9001,ISO 14001,ISO 45001 or superior quality suitable for drinking water and swimming pool complete all as specified and directed. Make:- Best Quality conforming to Indian Standard or as approved by Engr-in-Charge.

Supply of alum coagulant crystal type grade -I quality ,in factory sealed packet. Make - Best Quality conforming to Indian Standard or as approved by Engr-in-Charge.

Supply of Hydrated lime conforming to IS for water treatment in factory sealed packet. Make : Best Quality conforming to IS as approved by GE.

Supply of Polymer liquid for raw water floculant ,in factory sealed Container. Make: Bharat Trading corporation/Ion Exchange/Depac(Declibac) or equivalent as approved by E-in-C's Br/HQ CE Eastern Command Kolkata/ADG(NEI) Guwahati & conforming to Indian standard.

Supply of Alum ferric (Coagulant) grade-I quality conforming IS ,in factory sealed packet. Make:- Best Quality conforming to Indian Standard or as approved by Engr-in-Charge.

Supply of stable Bleaching Powder(Grade-I) confirms to IS-1065 Part-I 2019 in 25 Kg factory sealed container/drums. The bleaching powder should be free from lead and must have CIAS( corrosion inhibitor & anti scalant) that is suitable for treatment of drinking water complete all as specified and directed. Make:- Best Quality conforming to Indian Standard or as approved by Engr-in-Charge.