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| 1 | Drilling and boring pilot hole in any soil strata by drilling rig, collection of soil samples of different strata met with during drilling at various suitable levels, preservation of samples in polythene bags/ sample boxes and disposal of excess soil or mud, including the cost for bentonite, water etc. as required to maintain the pilot hole properly as per specification(IS:2800,Part-I) and direction of the Engineer-in-charge.A.With Contractor’s Rig |
| 2 | i) 200 mm dia |
| 3 | Reaming of pilot hole to an enlarged bore hole in any soil strata by drilling rig, disposal of excess soil or mud, including the cost for bentonite, water etc. as required to maintain the bore hole properly as per specification (IS:2800,Part-I) and direction of the Engineer-in-Charge.A.With Contractor’s Rig |
| 4 | i) From 200 mm dia pilot hole to 550 mm bore hole |
| 5 | ii) From 200 mm dia pilot hole to 460 mm bore hole |
| 6 | Washing of enlarged bore hole of 460/550 mm dia in any soil strata by drilling rig, disposal of excess soil or mud, including the cost for bentonite, water etc. as required to maintain the bore hole properly including lifting of drill pipes as per specification(IS: 2800,Part-I) and direction of the Engineer- in- Charge.A.With Contractor’s Rig |
| 7 | Providing and lowering of ERW pipe conforming to IS:3589-2001 (with latest revision)with drilling rig including painting with anti-corrosive bitumastic paints, fixing of M.S. ring, welding of all joints etc. complete after washing of the bore hole as per specification(IS: 2800,Part-I) & direction of the Engineer-in-Charge (ERW pipes will be supplied free of cost by the department from the departmental storeyard).A.With Contractor’s Rig |
| 8 | i) 300 mm dia ERW Housing Pipes. |
| 9 | ii) 200 mm dia ERW Blind Pipes. |
| 10 | iii) 200 mm dia ERW Slotted Pipes. |
| 11 | Providing and fixing of bail plug (made with 8 mm thick M.S. sheet)by welding with blind pipe including applying of anti-corrusive bitumastic, paint as per specification(IS: 2800,Part-I) and direction of the Engineer-in- Charge. i) For 200 mm dia ERW pipes |
| 12 | Providing and fixing of reducing socket (made with 8 mm thick M.S. sheet)by welding with blind pipe including applying of anti-corrusive bitumastic paint as per specification (IS:2800,Part-I) and direction of the Engineer-in- Charge.A.With Contractor’s Rigi) 300 X 200 mm dia |
| 13 | Providing and shrouding of the deep tube well assembly with washed pea gravels ( 2.0 - 4.75 mm effective size ) as per specification (IS : 4097) and direction of the Engineer - in - charge A.With Contractor’s Rig |
| 14 | i)With pea gravels obtained from Durgapur, West Bengal. |
| 15 | ii) With pea gravels obtained from Golaghat, Assam. |
| 16 | Providing and fixing of housing clamp(made with 12 mm thick M.S. sheet)by welding with blind pipe including applying of anti-corrusive bitumastic paint as per specification (IS: 2800,Part-I)and direction of the Engineer-in- Charge |
| 17 | i) 300mm dia |
| 18 | ii) 200 mm dia |
| 19 | Washing and development of tube well by using Air Compressor and testing of the well as per specification (IS: 11189) & direction of the Engineer-in-Charge.A. WithContractors Air Compressor |
| 20 | i)Using Air Compressor of 300-450 CFM output for DTW(Up to 200 Mtr Pipe Assembly) |
| 21 | ii)Using Air Compressor of 1100 CFM output for DTW(Beyond 200 Mtr Pipe Assembly) |
| 22 | Providing and fixing of Well Cap(made with 8 mm thick M.S. sheet)by welding with blind pipe including applying of anti-corrusive bitumastic paint as per specification(IS:2800,Part-I) and direction of the Engineer-in- Charge |
| 23 | i)For 300 mm dia ERW pipes. |
| 24 | ii)For 200 mm dia ERW pipes |
| 25 | Providing and filling of the abandoned pilot hole of deep tube well with available materials obtained from pilot hole/sand/earth/any other suitable materials as per specification and direction of the Engineer-in-charge.i) With available materials obtained from pilot hole(50%) and sandy earth(50%) |
