SPECIAL REPAIR/REPLACEMENT OF BOREWELL AT CHABUA AGAINST BER UNDER GE DINJAN

Amount

Drilling pilot bore hole of 250 mm dia by Reverse Rotary Dig Circulation Drilling Method (Direct Circulation Method) as described in IS 2800: 2019 in any kind of soil strata including hard stone/boulder upto 180 metre depth below ground level, including compound/ powder like valmite, bentonite solution, local silty clay etc. to be required as per the site condition including collecting samples from different strata, preparing and submitting strata chart/ bore log all complete all as specified and directed.

M & L for development of trial bore by reaming of bore well from 250 mm dia to 450 mm dia hole in two steps from 250 mm to 350 mm, 350 mm to 450 mm upto 60 m depth below the ground level from the top of ground including disposal of soil from the site complete all as specified and as directed.

M & L for development of trial bore by reaming of bore well from 250 mm dia to 450 mm dia hole in two steps upto 450 mm depth exceeding 60 m but not exceeding 180 mtrs depth below the ground level from the top of ground including disposal of soil from the site complete all as specified and as directed.

Supplying, assembling, jointing and lowering steel casing pipe for water wells, plain ended, 250 mm nominal bore of pipe, 7.1 mm wall thickness, ERW (Electric Resistance Welded) type, Fe 450 grade of steel, externally coated with bituminous solution conforming to IS-4270-2001 and fixing in position in different depth as directed, butt welded complete all as specified and as directed.

Supplying, assembling, jointing and lowering plain slotted pipe, type A, screen made of low carbon galvanized (LCG) steel, 200 mm nominal size, 7 mm wall thickness, 1 mm slot openings conforming to IS-8110: 2019 and fixing in position in different depth as directed, butt welded complete all as specified and as directed.

Supplying, assembling, jointing and lowering steel casing pipe for water wells, plain ended, 200 mm nominal bore of pipe, 7.1 mm wall thickness, ERW (Electric Resistance Welded) type, Fe 450 grade of steel, externally coated with bituminous solution conforming to IS-4270-2001 and fixing in position in different depth as directed, butt welded complete all as specified and as directed.

Supplying, assembling, jointing and lowering 7.0 mm wall thick 200mm diameter (internal) ERW pipe 6.00 mtr long, bail plug made by 200mm diameter ERW pipe and one closed by 7 mm thick MS plate welded and fixing in position (including necessary cleaning internal and external surfaces and painting inside and outside of pipes with two coats of black paint for drinking purpose) and fixed at bittom of casing pipe plane ended jointed by suitable size socket with full welding complete sorrounding the pipes in both ends to make leak proof complete all as specified and as directed.

Supply and fixing MS reducing socket 250x200 mm having thickness 6.0 mm wall thickness heavy duty with 20x4 mm MS flat iron centre guide 400 mm long 04 No for jointing housing/ blank pipe of bore well including necessary welding work complete all as specified and as directed.

Supplying, designing, packing gravel, hard quartz (about 90-95 percent silicon dioxide (SiO2)) or other suitable material with an average specific gravity of not less than 2.5, not more than 10 percent by weight of the material shall have specific gravity of less than 2.25, not contain more than 5 percent by weight of calcareous material, not more than 2 percent by weight of thin flat or elongated pieces, the larger dimension not be more than 3 times the smallest dimension, sub rounded to rounded grains with least angular features, free from impurities such as shale, mica, feldspar, clay, dirt, loam, hematite, organic material etc. for the tube well in accordance with IS: 4097: 2019 as per the site requirement complete all as specified and as directed.

Development of tube well in accordance with IS 2800: 2019 and IS:11189 with compressed air method (open well method), 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 complete all as specified and as directed.

Determining approximate yield capacity using the compressor of the drilling rig and carrying out yield test as per IS 2800: 2019 using test pump and determining the yield capacity of bore well, the rate of pumping without lowering the water level below the top boundary of the aquifer, the top of the perforations, the recommended rate of pumping complete all as specified and as directed.

S & F pressure gauge 4" dial 0 to 14 kgs rating complete all as specified and as directed.

S & F well cap to the top of bore well, made of flat iron of hot rolled medium and high tensile structural steel of grade E 250 quality C conforming to IS 2062: 2011 and as per IS 2800: 2019 including necessary bolts & nuts of required size complete all as specified and as directed.

Supply and laying of MS pipe heavy grade with all fittings laid in floor or fixed to the walls or celling of size 100 mm bore complete all as specified and directed

S & F hot rolled medium and high tensile structural steel of grade E 250 quality C conforming to IS 2062: 2011 as in Compound girders and stanchions, lattice girders, aerial masts, staging for water tanks and the like including caps, bases, splices etc. built up from two or more beam or channel sections or angles with plates, including all lattice bars, stiffeners, gusset plates, etc. complete all as specified and as directed.

Resistivity variation studies in bore hole drilled by electric logging of pilot bores by expert of Geology division to know the potential and temperature probes of drinking water by approved agency duly collaborated with strata chart/bore log complete all as specified and as directed.

S & F centralizer (centring Guides), made of flat iron and bar of hot rolled medium and high tensile structural steel of grade E 250 quality C conforming to IS 2062: 2011 and as per IS 2800: 2019 including necessary bolts & nuts & welding of required size complete all as specified and as directed.

Disinfection of bore well as per IS 2800: 2019 using 200 milligrams of powdered chlorine compound per litre of water present in the well and left in the well for at least 8-12 hours to ensure elimination of any bacteria complete all as specified and as directed.

Fabrication and supply of Strata sample wooden box, made out of 20mm thick veneered particle board and partition with 12 mm thick plywood with job 1200x750 mm with 10 partitions of size of 150mm x 150mm, 100mm deep with front glass sheet sliding type cover with aluminium frame all round, 2 No's key hole plate of size 40x25x3mm thick, complete all as specified and as directed. (Name of tubewell, location, strata sample with depth shall be written as per direction of Engineer-in-charge.)

S & F direct on Line starter in open execution suitable for 415V, 3ph,, 15 HP with SPP feature, with relay range 9-15 amps, for centrifugal/submersible pump set.

Supply and fixing galvanised steel wire rope multistrand of size 8 sqmm as per ISO 4309 : 2019 and safe for carry a point load of 48.6 KN/5 Ton, for lowering of pump/column pipe, complete all as specified and directed by Engr in charge. Make Usha Martine Model Hyflex 18

Testing of water sample of untreated water , treated water at installation and also at user end for bacteriological analysis & Chemical analysis from NEIST Jorhat/ DRL Tezpur or any Govt. approved / recognized Lab as approved by the GE complete all as directed.( Note: Test report shall be submitted to GE along with RAR /FB)

M & L for cement concrete in foundation, filling and mass concrete in M15(Nominal Mix) using 40 mm nominal size graded crushed stone aggregate complete all as specified and as directed.

M & L for cement concrete M15 (Nominal Mix) using 40 mm nominal size graded crushed stone aggregate 100 mm thick in flooring finished even and smooth without using extra cement complete all as specified and as directed.

Supplying & laying in trenches 100 mm nominal bore, medium grade, galvanised coated steel tube conforming to IS 1239 (Part-1): 2004 including all fittings conforming to IS 1239 (Part-2): 2011 complete all as specified and as directed.

Supplying & laying in trenches 80 mm nominal bore, medium grade, galvanised coated steel tube conforming to IS 1239 (Part-1): 2004 including all fittings conforming to IS 1239 (Part-2): 2011 complete all as specified and as directed.

M & L for non-rising stem type sluice valves having double flanged for connections of nominal pressure (PN 1.6) as per IS 14846: 2000 of preferred materials, nominal size 100 mm including nuts, bolts, packing sheets etc. complete all as specified and as directed.

S & F flanged reflux valve (non-return) of single door, swing check type nominal pressure (PN 1.6) of preferred materials as per IS 5312 (Part 1): 2004, nominal size 100 mm complete all as specified and as directed.

Cutting the existing cast iron/ galvanised iron pipes 100 mm bore in position for insertion of new tees, branches, etc. complete all as specified and as directed.

M & L for cement concrete in foundation, filling and mass concrete in M10(Nominal Mix) using 40 mm nominal size graded crushed stone aggregate complete all as specified and as directed.

M & L for construction of new valve chamber of size 900 mm X 900 mm X 900 mm including necessary earth work in any type of soil, PCC foundation M10(Nominal Mix) using 40 mm nominal size graded crushed stone aggregate as in base concrete, brick work (one and half brick thick) in CM 1:6 with 20 mm thick cement plaster internally and externally in two coats of (12 mm and 8 mm) in cement mortar 1:4, 3 mm thick mild steel cover of structural steel of grade E165 as per IS 15911: 2010 riveted with angle iron (50 mm X 50 mm X 6 mm) frame of structural steel of grade E165 as per IS 15911: 2010, frame welded to base plate of size 150 mm X 12 mm and made of structural steel of grade E165 as per IS 15911: 2010, base plate fixed with 300 mm thick PCC coping in M15(Nominal Mix) using 20 mm nominal size graded crushed stone aggregate 50 mm X 50 mm X 6 mm mild steel washer, PCC benching 200 mm thick in M15(Nominal Mix) using 40 mm nominal size graded crushed stone aggregate with necessary, welding, riveting, bolting including painting exposed steel surfaces with two coats of bituminous paint and embedded surfaces of steel with two coats of tar, finishing exposed faces of concrete surfaces and plaster surfaces with three coats of white wash as per drawing No. TD/EM/6 sheet Nos 1/2 & 2/2 of HQ CE Shillong Zone complete all as specified and as directed.

Supply, installation, testing and commissioning of stainless steel submersible pump, electric driven 415 V, TP suitable for 550 mm dia bore well ( Casing pipe size 300 mm) 15 HP, flow rate not more than 46 cum/hr, head 132m, complete all as specified and as directed.

S & F submersible cable flat PVC insulation of type C and having PVC sheath of type ST2, flexible copper conductor, FR-LSH, 3 core of size 10 sqmm complete all as specified and as directed.

Supply, laying, jointing, testing and commissioning cross-linked polyethylene (XLPE) insulated cable for working voltages of 1100 V, PVC sheathed, armoured, 3 core with reduced neutral conductors (3½ core), nominal cross sectional area of main conductor 25 sqmm, stranded aluminium conductor, ISI marked as per IS 7098(Part-I): 1988 including cable glands, lugs etc. to suit the cable size and to be laid in trenches, fixed along pole, under floors, through GI pipe laid under floors/roads, through concealed GI pipe along wall etc. complete all as specified and as directed.

Excavating in trenches not exceeding 1.5 m wide and not exceeding 1.5 m in depth; for foundation, etc. or for shafts, wells, cesspits, manholes, pier holes, etc. or for cable laying or water supply pipes lines etc or not exceeding 10 sqm on plan and not exceeding 1.5 m in depth and getting out in soft/ loose soil complete all as specified and as directed.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exceeding 25 cm in soft/ loose/ hard/ dense soil complete all as specified and as directed.

Supply & spreading in trenches dry river sand cushioning to underground cable in trenches including spreading, levelling hand punning down complete all as specified and directed Note:- Depth of sand cushioning will be measured after punning down and levelling the sand properly.

Removing excavated material (soils) not exceeding 50 m and depositing where directed at a level n exc. 1.5 m above the starting point

M & L for laying of bricks locally available sub class 'B' bricks (old size) for cable protection cover laid flat and dry in trenches over the cable perpendicular to the direction of cable all as directed.

Supplying & fixing to walls and ceilings or laid in floors 40 mm nominal bore, light grade, galvanised coated steel tube conforming to IS 1239 (Part-1): 2004 including all fittings conforming to IS 1239 (Part-2): 2011 complete all as specified and as directed.

Supplying & fixing to walls and ceilings or laid in floors 40 mm nominal bore, medium grade, galvanised coated steel tube conforming to IS 1239 (Part-1): 2004 including all fittings conforming to IS 1239 (Part-2): 2011 complete all as specified and as directed.

S & F 40 mm nominal size, screw down stop valves, cast copper alloy body and body components with crutch handle, bright finished complete all as specified and as directed.

Supplying, installing, testing and commissioning chemical dosing pump, made of plastic, diaphragm type, capacity 02 litres per hour @ 10 kg back pressure comprising suction valve, delivery valve etc. operated on single phase AC electric supply, 230 V, 50 Hz complete all as specified and as directed. Make- RMCO- model NO RPQ-40 or equivalent make given in Appx B

M & L for earthing complete with galvanised steel plate earth electrode 600 mm X 600 mm X 6 mm thick, buried directly in ground (earth pit not less than 2.25 metres deep below ground level) with top edge of the plate not less than 1.5 metres below normal ground level, connected to earthing lead of 32 mm X 6 mm galvanised mild steel strip by means of bolts, nuts, check nuts and washers of galvanised iron from earth plate to test point upto 7.5 metre including all as shown in electrical plate No. 3 of SSR Part I (2009) including necessary concrete chamber in cement concrete M15 (Nominal Mix) using 20 mm nominal size coarse aggregate, precast RCC cover slab in cement concrete M15 (Nominal mix) using 20 mm nominal size coarse aggregate of size 40 cm X 40 cm X 5 cm reinforced with 8 mm dia TMT bars @ 150 mm c/c with one handle for lifting made out of 8 mm dia bar, GI funnel, GI wire mesh filter, 20 mm dia GI pipe medium grade for watering, 40 mm dia GI pipe medium grade for protection of earthing lead, charcoal or coke and salt in alternate layers including necessary excavation and earth work in any type of soil/ strata and testing complete all as specified and as directed by the Engineer-in-charge.

S & F 100 mm dia cast iron Venturi flanged type of length about 2 mtr including nuts bolt & washers etc complete all as specified and as directed.

PURBANCHAL BUILDERS