Construction of Machine Drilled Bore Well NLO Nisar Ahmad Padder and Gh. Ahmad Ganie and Others.

Drilling of 125 mm diameter tube well by air rotary drilling rig unit suitable for lowering of MS casing of 125 mm diameter in suitably drilled bore hole as per specifications laid down in IS 2800 (Part-I) with up-to-date amendments. The job is to be done in all kinds of soils, boulder, rocks, collapsible strata, saturated soils, artisan conditions by all available mechanical attachments (ODEX/DTH/Air Rotary) and exploration of ground water by tapping sufficient aquifer zones. The job includes the cost shifting of drilling accessories, tools, bits, casing shoe, consumables like fuel, lubricants, skilled and unskilled labours and other unforeseen items. Development of tube well with backwash method with air compressor of minimum capacity 1000 CFM (300 PSI air delivery system) with suitable arrangements till well is thoroughly developed in all respects as per the directions of site engineer.

P/F of MS 125 mm dia pipe and subsequent lowering of casing assembly and its welding after every 10 feet, up to the drilled/desired depth. The casing is to be slotted as per the site requirement and as directed by site engineer. The specifications of the tube well shall be as per IS 4270 : 2001.

Supply, Installation, Testing and commissioning of INDIA Mark II hand pump assembly comprising of cylinder, head, handle assembly, front cover, handle, axle, washers, nuts/bolts.

Providing/fitting of risers 32 mm dia (GI pipe type B) including sockets etc. (each riser of 3 mtr)

Providing / fitting of connecting rods G.I for INDIA Mark II Hand Pump (each connecting rod of 3 mtr)

Providing / Laying of Plain Cement Concrete block of size 4 ft × 4 ft × 1 ft in 1:3:6 mix to give adequate strength to act as a sanitary block for the well and to grout the hand pump assembly in order to make it robust to resist shock load observed while pumping. The job includes providing / laying of PCC edges of 4" × 4" in 1:3:6 mix and providing / laying of cement plaster in 1:4 mix to the above block to give aesthetically good appearance. Cost on account of shuttering, strutting, centering, curing etc. is included in the scope of work. In case the suitable space for the above specification is not available, the surface area is to be adjusted accordingly.