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| 1 | Drilling and boring pilot hole in any soil strata by deep drilling / high power 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 high power rig i) 320mm dia |
| 2 | I) Upto 250m |
| 3 | II) Beyond 250m and upto 375m |
| 4 | Reaming of pilot hole to an enlarged bore hole in any soil strata by deep 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 high power Rig |
| 5 | I)Upto 250m i) From 320 mm dia pilot hole to 550mm bore hole. |
| 6 | I)Upto 250mii) From 320 mm dia pilot hole to 460mm bore hole. |
| 7 | II) Beyond 250m and upto 375mi) From 320 mm dia pilot hole to 460 mm bore hole |
| 8 | Washing of enlarged bore hole of 460-550 mm dia in any soil strata by deep 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 high power Rig |
| 9 | Providing and lowering of ERW pipe conforming to IS:3589-2001 (with latest revision) with deep 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 specificastion (IS : 2800 (part-I)) and direction of the Engineer-in-Charge. A. With contractor\"s high powerRig |
| 10 | i) 300 mm dia ERW Housing Pipe |
| 11 | ii) 200 mm dia ERW Blind Pipe |
| 12 | iii) 200 mm dia ERW Slotted Pipe |
| 13 | Providing and fixing of bail plug (made with 8 mm thick MS 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 high power Rig i) For 200 mm dia ERW pipes |
| 14 | Providing and fixing of reducing socket (made with 8 mm thick MS 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 high power Rig i) 300 X 200 mm dia. |
| 15 | Providing and shrouding of the deep tube well assembly with washed Pea-gravels ( 2.0 - 4.75 mm effective size) asper specificastion (IS:4097) using deep drilling rig and direction of the Engineer-in-Charge. A. With contractor\"s high power Rig |
| 16 | i. with pea gravels obtained from Durgapur, West Bengal. |
| 17 | ii. with pea gravels obtained from Golaghat, Assam. |
| 18 | Providing and fixing of housing clamp(made with 12 mm thick MS 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. |
| 19 | i) 300 mm dia. |
| 20 | ii) 200mm dia. |
| 21 | Washing and development of tube well by usingair compressor and testing of the well as per specification(IS:11189) & direction of the Engineer-in-Charge.A. With contractor\"s air compressor |
| 22 | I. Upto 200 mtr pipe assembly i) Using Air Compressor of 300-450 cfm output for DTW |
| 23 | II. Beyond 200 mtr pipe assemblyi) using air compressor of 1100 cfm output |
| 24 | Providing and fixing of Well Cap (made with 8 mm thick MS 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. |
| 25 | i) For 300 mm dia ERW pipes |
| 26 | ii) For 200mm dia ERW pipes |
| 27 | 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 form pilot hole (50%) and sandy earth (50%) |
