Sinking of 6(Six) no DTW within the jurisdiction of DWS Sub division-III,Kunjaban,Agartala during the year 2025-26

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 i) 200 mm dia

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

i) From 200 mm dia pilot hole to 550 mm bore hole

ii) from 200 mm dia pilot hole to 460 mm bore hole

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

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.

i) For 200 mm dia ERW pipes

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 A.With Contractor’s Rig

i) 300 mm dia ERW Housing Pipes.

ii) 200 mm dia ERW Blind Pipes.

iii) 200 mm dia ERW Slotted Pipes.

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 Rig

i) 300 X 200 mm dia

Providing and Shrouding of the deep tube well assembly with washed Pea-gravels ( 2.00 - 4.75 mm effective size)as per specification (IS:4097) & direction of the Engineer-in-Charge. A.With Contractor’s Rig

with pea gravels obtained from Durgapur, West Bengal

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

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 compressor i) Using air compressor of 1100 cfm output.

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. i) for 300 mm dia ERW pipes