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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 |
| 2 | Upto 250 mtsi) 320 mm dia |
| 3 | Beyond 250 mtr. and upto 375 mtr.ii) 320 mm dia |
| 4 | Beyond 375 mtr. and upto 500 mtr.ii) 320 mm dia |
| 5 | 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 rigI)Upto 250 mts |
| 6 | i) From 320 mm dia pilot hoe to 550 mm bore hole |
| 7 | ii) From 320 mm dia pilot hoe to 460 mm bore hole |
| 8 | Beyond 250 mtr. and upto 375 mtr.iv) From 320 mm dia pilot hoe to 460 mm bore hole |
| 9 | IBeyond 375 mtr. and upto 500 mtr.iv) From 320 mm dia pilot hoe to 460 mm bore hole |
| 10 | 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 |
| 11 | 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 specification ( IS : 2800 (part-I)) and directionof the Engineer - in - charge.A) with contractor\"s high power rig |
| 12 | i) 300 mm dia ERW Housing Pipe |
| 13 | ii) 200 mm dia ERW Blind Pipe |
| 14 | iii) 200 mm dia ERW Slotted Pipe |
| 15 | Providing and fixing of bail plug ( made with 8 mm thick MS sheet ) by welding with blind pipe including applying of anticorrusive bitumastic paint as per specification ( IS : 2800 (part- I)) and direction of the Engineer - in - charge. i) For 200 mm dia ERW pipes |
| 16 | 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 rigi) 300 X 200 mm dia |
| 17 | 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) using deep drilling rig and direction of the Engineer - in - charge. A) With contractor\"s high power rigi. With pea gravels obtained from Durgapur, West Bengal. |
| 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. i) 300 mm dia |
| 19 | Washing and development of tube well by using air compressor, and testing of the well as per specification ( IS : 11189 ) and direction of the Engineer - in - charge.II) Beyond 200 mtr pipe assembly A) with contractor\"s air compressorii) using air compressor of 1100 cfm output |
| 20 | Providing and fixing of well cap ( made with 8 mm thick MS sheet ) by welding with blind pipe including applying of anticorrusive bitumastic paint as per specification ( IS : 2800 (part- I)) and direction of the Engineer - in - charge.i) For 300 mm dia ERW pipes |
| 21 | Providing and filling of the abandonned pilot hole of deep tube well with available materials obtained from pilot hole /Sand/earth/any other suitable materials as per specifications and direction of the Engineer-in- Charge i. With available materials obtained from pilot hole (50%) and sandy earth(50%) |
| 22 | Cleaning by cutting trees,bushes etc & levelling the site by engaging excavator, labourer etc. As per the direction of the Engineer incharge. |
