Major Works Water Supply Scheme South Tripura Replacement 1 Deep Tube Well including drilling development ERW pipes pea gravels pump house staging column assembly pipeline reconnection works at ONGC Gajalia Nabagram GP Satchand RD Block during 26-27

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.

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

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 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