Development of 90mtrs deep 4Nos Tubewell at Node No 3 Food Craft Institute Node No 4 village Ther Node No 5 Sheela Chowk and Node No 6 Tea Factory

Amount

Transportation of Rig along with allied accessories etc. complete including erection and levelling at site, through all kinds of roads, approaches, fields etc. i/c all leads and lifts up to site of work complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Drilling of bore as per specification laid down in IS-2800-1991( part-1) with upto date amendments if any with percussion Rig, direct rotary or combination drilling Rig starting with 650-600mm dia MS pipe reduced to 450-400mm dia MS pipe conforming to IS-4270-2001 with upto date ammendments, if any, in all kinds of soil such as boulders, rocks, collapsible strata, saturated soil, artesian condition including the cost of consumable stores, water, fuel, lubricants and other accessories etc. complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Drilling and lowering of MS casing pipes conforming to IS-4270-2001 with upto date amendments, if any of suitable sizes as mentioned above from 5-30 mtrs below ground level within all leads and lifts. (i) 0 to 5 mtrs

Drilling and lowering of MS casing pipes conforming to IS-4270-2001 with upto date amendments, if any of suitable sizes as mentioned above from 5-30 mtrs below ground level within all leads and lifts. (ii) 5 to 30 mtrs

Drilling and lowering of MS casing pipe conforming to IS-4270-2001 with upto date amendments, if any of suitable size as mentioned above from 30-60 mtrs below ground level within all leads and lifts. (iii) 30 to 60 mtrs.

Drilling and lowering of MS casing pipe conforming to IS-4270-2001 with upto date amendments if any of suitable sizes as mentioned above from 60-90 mtrs below ground level with in all leads and lifts. (iv) 60 to 90 mtrs.

Collection, preservation and display of suitable size sample box with top lid and locking arrangement till handing over of the tube well to the department complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Supply and lowering of IS marked electric resistance welded MS pipes 300mm dia nominal size housing 8mm thick having outside diametre 323.90mm screwed and scoketted conforming to IS 4270-2001 with upto date ammendments if any in a random length of 4 mtrs to 7 mtrs welded without any circumferential joints into bore hole in vertical position including cost of all scaffolding,derricks, poles clamps embedded in foundation etc including cost of all cutting, threadings, and welding of pipes etc within all leads and lifts complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Providing, Fabrication and lowering of MSERW pipe 300mm Dia MS slotted pipe 300mm nominal size housing 8.00mm thick having outer dia 323.90mm conforming to IS-specification No. 4270-2011 with upto date ammendments if any about 4 mtrs to 7 mtrs in length should have 1600 slots per mtrs as per IS 8110-1985 of 75x1.57mm slot size welded about any circumfrences joints into the hole vertical position including cost of scaffolding derricks poles clmaps emmbended in foundation etc.

Providing and fixing M.S centralized guides at suitable spacing for each tube well as per IS-226-1991 with uptodate amendments if any within all leads and lifts 1x4 Nos complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Supply, lowering and fixing in position IS marked mild steel bail plug of 300mm dia meters with "U" hooks as per ISI-2800-1991 with upto date ammendments, if any within all leads and lifts complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Providing and fixing in position welded iron cap with locking arrangement of approved design to prevent foreign matter from getting into bore hole as required within all leads and lifts complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Providing and packing of gravel consisting of hard quartz or other suitable material with an average specific gravity of not less than 2.5 not containing more than 2% by weight of thin flat or elongated pieces shall be of sub rounded pr rounded grains with minimum angular features of size 2- 3.35 mm & shall be free from impurities such as shafe, shales, mica, felspar , clay, sand, dirt, loam beamatte and organic material as per IS-4097-1967 with upto ammendments if any around intake of tube well within minimum thickness of shround around screen generally 100mm to the entire depth of the bore as per IS 2800 (Part.I) 1991 with upto date ammendments if any within all leads and lifts complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Extraction of all sizes blind /casing pipes with machine starting from the bottom of the bore hole with in all leads and lifts complete in all respect as per the direction of the Engineer-in-charge.

a) In contact with soil

Development of tube well by back washing method, with air compressor of minimum 750CFM capacity pumping pipe of 200mm size and air line of minimum 65mm size or with other suitable method, till the well is thoroughly delveoped as per clause 4.2 of IS-11189-1985 with upto date amendments if any complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Development of tube well by continuous over pumping method with VT pump /submersible pumps of suitable capacity not less than double the discharge established by the compressor method /design discharge until the well is sand free as per IS-11189-1985 with upto date ammendments. if any, complete in all respect as per direction of the Engineer-in-charge. The draw down and discharge to be established by running the VT /submersible pump continously for 8 hours in the presence of officer not less than the rank of Assistant Engineer.

Testing the verticalty of the tube well as per clause 4.3 of IS-2800 (Part-II) 1979 with upto date ammendments, if any using plumb or plunger 6mm smaller in dia within the inside diametre of the well casing.The results of the verticalty test shall be recorded on proforma shown in appendix A of IS-2800(Part.II) 1979 with upto date ammendments, if any, as appended with the tender documents and handed over complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Dismentalling of the Rig and other allied accessories after completion of job within all leads and lifts complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Construction of barbed wire enclosure of minimum of size 2.5x2.5m to safe guard the bore of tube well with angle iron of size 40x40x6mm , 1.5mtr in height embedded in concrete block of 30x30x30cm in all leads and lifts complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Handing over of the tubewell in complete shape as per appendex "B" of of IS 2800 (Part-II)1979 with up to date ammendments if any, as appended with the tender documents, in laminated from in triplicate complete in all respects as per the direction and entire satisfaction to the Engineer-in-charge.

Kamlesh

NEW APSARA BOREWELL