Drilling of 04 No. Bore wells and installation of casing pipe at Left Bank of Teesta-V Power Station, Balutar (Total Loss under Insurance Claim).

Deployment of underground water detection system for drilling of Bore well.+B4:B11

Drilling of bore well, by using heavy duty hydraulic power ring and air compressor for drilling 8’’ dia tube wells by ODEX 165 method of drilling through any kind of soil, boulders and rock upto desire depth including hiring and running charges of machineries, equipment and cost of labour, fuels/ Lubricants etc. as a required welding casing pipe and casing shoes etc.

Supplying, assembling, lowering and fixing in vertical position in borewell, ERW (Electric Resistance Welded) FE 410 plain slotted (having slot of size 1.6/3.2 mm) mild steel threaded and socketed/ plain bevel ended pipe (type A) of required dia, conforming to IS: 8110, of reputed and approved make, having wall thickness not less than 5.40 mm, including painted with outside surface with two coats of anticorrosive bitumestic paint of approved brand and manufacture, including hire & labour charges, fittings & accessories, all complete, for all depths, as per direction of Engineer-in-charge. 200 mm nominal size dia.

Supplying, assembling lowering of LCG (low carbon galvanized) strainer 200 mm dia including packer.

Development of tube well in accordance with IS : 2800 (part I) and IS: 11189, to establish maximum rate of usable water yield without sand content (beyond permissible limit), with required capacity air compressor, running the compressor for required time till well is fully developed, measuring yield of well by 'V' notch method or any other approved method, measuring static level & draw down etc. by step draw down method, collecting water samples & getting tested in approved laboratory, i/c disinfection of tubewell, all complete, including hire & labour charges of air compressor, tools & accessories etc., all as per requirement and direction of Engineer-in-charge.

Providing and fixing suitable size threaded mild steel cap or spot welded plate to the top of bore well housing/ casing pipe, removable as per requirement, all complete for borewell of:200 mm dia.

Providing and fixing M.S. clamp of required dia to the top of casing/ housing pipe of tubewell as per IS: 2800 (part I), including necessary bolts & nuts of required size complete:200 mm clamp.

Providing and fixing Bail plug/ Bottom plug of required dia to the bottom of pipe assembly of tubewell as per IS:2800 (part I).:200 mm dia.