Kandala TW 2nd Time

TUBEWELL

Drilling of 500mm dia bore with reverse rotary rig in all kinds of soil including the cost of consumable stores, fuel oil and transportation of rig to the site. Complete in all respects.

Drilling of 500mm dia bore with reverse rotary rig upto 150 mtr depth BGL.

Drilling of 500mm dia bore with reverse rotary rig beyond 150 mtr depth upto 300 mtr depth

Note: 1. Erection and dismantling of boring plant including all arrangement for the transportation of the boring equipment to site of work from the store of contractor at site and back are to be made by the contractor at his own cost. All rates should be quoted for supplying the material at site of work. Pits for collection of Water and Water for drilling tube-well be arranged by the firm/ contractor at site at his own cost.

2. In case the bore is converted into a tube-well payment of bore shall be made up to the bail plug plus margin (7% of main bore drilling or as actual as per field requirement whichever is less) required for sustaining the main bore. The test bore beyond margin shall be paid at the rate of test bore drilling.

Making electric Logging of borehole with electronic well logger including cost of equipment at site etc.complete in all respect.

Supplying, lowering of MS Pipe as per IS:4270-2001 including MS sockets having dimensions as per IS code duly welded with MS electrode to have extra strength to lower the pipe into tubewell bore.

200mm Nominal Diameter (Weight 41.6 kg/mtr) 8.00mm Thickness

Supplying, lowering of Stainless Steel Cage type wire wound screen as per IS:8110-2000 or latest with SS socket to connect Strainer to Strainer Duly welded with suitable grade S.S welding electrode to lower the strainer into tubewell bore.

200mm internal diameter (slot size 0.75mm/1.00) 8.00mm thickness

Supplying and fixing of bail plug of M.S pipe complete with inverted U-hook attached to the bottom plug Complete in all respects.

200mm internal diameter (weight 41.6kg/m) 8.0 mm thickness

Supplying, fixing and lowering of stainless steel socket as per IS 8110-2000 or latest, ISI marked duly welded with suitable grade SS welding electrode to lower the strainer into tubewell bore complete in all respect.

200mm Internal Diameter

Supplying, lowering & fixing of M.S. special socket to connect S.S. Strainer to M.S pipe duly welded with suitable grade welding electrode complete in all respects.

200mm Internal Diameter

Supplying and fixing well cap having thread to fix on housing pipe. Complete in all respects.

200mm Internal Diameter

Supplying & fixing of M.S Clamp of size 150mm X 12mm made out of MS Flat 1.52m long, suitable to fit Housing pipe including the cost Nut & Bolts of Suitable size complete in all respect.

Supplying at site Wooden Box of suitable size with Lid & locking arrangment for preserving strata sample collected from the bore.

Collection of water sample from different strata and testing of sample from approved laboratory (Physical & chemical Analysis)

Supplying and fixing Mild steel centering guide made out of 32mm x 6mm thick M.S. bar complete in all respects.

Supplying and fixing sanitary seal having rubber tight on housing pipe . Complete job in all respect 200 mm dia

Supplying of tibba sand /local sand over gravel packing & clayseal, upto G.Level between pipe assembly and bore as per BIS 2800-2019 including carriage Complete job in all respect (upto 90 mt depth approx.)

Supplying of clay to provide imprevious layer in between pipe assembly and bore above gravel packing as per BIS 2800-2019 including carriage of material. Complete in all respect.

Supplying at site of gravel of 1/16" to 1/8" sizes including pouring and packing in the annular space between the pipes assembly and the bore.The gravel should be free from, dust,dirt, or the vegetable manner as per IS 4097/1967 with latest amendments .( to be paid as per actual length of pipe)

Provision for Sterilisation of tubewell with sodium hypochorlide/ chlorination of well as per IS code 2800: 2019 complete job. The well shall be disinfected or sterilized as per IS code 2800:2019 or latest, after the development by pump and before the final test. All wells regardless of the use should be sterilized on completion to prevent or retard the growth of corrosion or incrustation fostering organisms. This should be done by introducing chlorine into the water in the well and immediate aquifer surrounding the well .The volume of water in the screen and casing should be estimated and sufficient chlorine added to yield for water with chlorination of 1000 ppm. The solution should be poured into the well and thoroughly mixed in the well by surging with pump. The solution should remain in the well for at leaset 6 hours during which it should be surged at about 2 h interval. After expiration of contact time , the well should be pumped initially back into the well for abour 30 minute and late to waste until there is little of no odour or taste of chlorine in the discharged water . IT has been found that using hypochlorite is of 10% concentration, the requirement of hypochlorite is 10 litre for every cubic meter of water in the well to produce.

Testing of water sample for .Heavy metal from approved laboratory (Aluminium, selemium, cadmium, chromium, lead, mercury, arsenic, nickel & uranium pesticide etc.)

Development and Stabilizing of the tubewell with air compressor of required capacity as directed by the engineer-in- charge including cost of tools, appliances & consumable to the satisfaction of Engineer-in-charge.

Capacity of Air compressor 500 cfm at 600 PSI

Development and Stabilizing of the tubewell with submersible pump of required capacity as directed by the engineer-in- charge including cost of tools, appliances & consumable to the satisfaction of Engineer-in-charge.