Construction of 01 No150mm SBDTW at Shyam Para BOP under 121 BN BSF by contractors own Mini Rig, including UPVC pipes, pea gravels, installation of submersible pump motor, pipeline and allied works under DWS Division Sabroom, 2025-26 Deposit Work

Drilling and boring pilot hole in any soil strata by mini 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 Mini Rig i)150mm dia.

Reaming of pilot hole to an enlarged bore hole in any soil strata by mini 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 Mini Rig i) From 150 mm dia. pilot hole to 350 mm bore hole

Washing of enlarged bore hole of 350 - 550 mm dia. in any soil strata by mini 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 Mini Rig

A. UPVC 'CM' casing pipes i) 150 mm dia.

B. UPVC 'RS' pipe i) 150 mm dia.

Providing and fixing of UPVC end cap suitable for UPVC 'CM'casing or 'CS' casing or 'RS' pipes as per specification and direction of the Engineer - in - charge. i) 150 mm dia.

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 Pea-Gravel obtain 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 anticorrusive bitumastic paint as per specification ( IS : 2800 (part-I) and direction of the Engineer - in - charge. i) 150 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. I.upto 200 mtr pipe assembly A)with Contractor's own Air Compressor i) using air compressor of 300 -450 CFM output for SBDTW