Water Supply And Sanitation Department Tender

Drilling of 550mm dia bore with Reverse Rotary Rig Beyond 300 m depth BGL to onward depth

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.

250mm Nominal Diameter (Weight 52.3 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.

250mm internal diameter (slot size 0.75mm) 7.30mm 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.

250mm internal diameter (weight 52.3kg/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.

250mm 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.

250mm Internal Diameter

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

250mm 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 250 mm dia (As per BIS 2800-2019)

Supplying of tibba sand /local sand over gravel packing & clayseal, upto G.Level between pipe assembly and bore including carriage . Complete job in all respect (upto 75 mt depth approx.)

Supplying of clay to provide imprevious layer in between pipe assembly and bore above gravel packing including carriage of material. Complete in all respect. (As per BIS 2800-2019) (3 mtr)

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. (As per BIS 2800-2019)

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 550 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.

Providing, Laying , fixing & jointing of P.V.C. Pipes as per ISI-4985 (ISI marked with the prior approval of Engineer-in-Charge) along the Trenches and laying the same in Trenches to correct alignment and gradients, cutting, jointing and testing complete as per specifications including excavation. (By Mechanical means)

160mm o/d pipe of 10kg/sqcm (Rising main)

Providing & fixing C.I/D.I Flanged end, stem of SS (AIS 1410) and Bronze (gunmetal) working parts Sluice Valves ISI marked 14846-2000, including jointing, testing & cost of Nut, Bolt & insertion sheet, all carriage complete (with the approval of Engineer - in – charge)

150 mm I/d

Prov. Installing, testing & commissioning one No. Electronically actuated, Diaphragm Operated, Metering System, Chemical Dosing Chlorinator ,suitable for delivering 0.5 to 6 Litres of Bleaching Powder Solution/Sodium Hypo solution per hour under maximum delivery pressure up to 7 Kg.cm2, and suction lift not less than 1.5 m, as per DWSS. standard specifications.

Providing, installing, testing and commissioning of 1 no. Electrically driven pumping set of reputed make , capable of deleviring 516 lpm against a head of 123 mtr (27.50 BHP) . Complete in all respects

Supplying lowering of 100 mm dia GI pipe as per IS 1229 including GI sockets . Complete in all respects

Providing and fixing of submerssible of 6 mm ² core cable , complete in all respect

Providing installing, testing and commissioning of 1 no. control panel with closed transition star delta with enclosure consisting of electrical appliances such as contactor, furses, MCCB's over load relays , isolator switches wiring and connnections. Complete in all respect .

Providing and installing 150mm dia delivery main (From Tube well to Duck Foot bend including cost of C.I/D.F Pipes, D/F Sluice valves, D/F NRV & Specials as C.I Bends, Tail Piece Tees etc.. inside the pump chamber as per standard design complete in all respects

Construction of Gravel Pit outside the Pump Chamber. (0.90m Dia.) as per standard design & drawings of public health department.