Construction of Tubewell, Roof treatment at Kumargram Substation under Alipurduar Division

Labour for boring through any type of soil for sinking tube well of required dia. with top enlargement by rig boring system (either by reserve circulation or by direct rotary method) including hire charges and labour for rig machine, tools and plants, staging, force pumping set and making arrangement for water required for boring etc. complete and lowering of pipes, strainers, blind pipes etc. complete. (a) For depth upto 250 M for 100 mm dia. Tube well with top enlargement of 200 mm dia.(upto 50 M). (i) First 50 m

(ii) Next 50 m

(iii) Next 50 m

Supply and delivery at site UPVC pipe (CM) conforming to IS: 12818:2010 (CIPET certified). D) 150 MM

Supplying, fitting and fixing check valve (horizontal) G.M. tested to 21 kg per sq. cm. (vi) 50 mm dia.

Supply fitting fixing column pipe , Make: Skipper or Equivalent, SP Heavy, Pressure Rating 35 kG/cm2 complete in all respect including necessary fittings complete in all respect. (a) 50mm dia

Collecting sample of water for bacteriological and chemical test from any depth at any time during execution of work including hire and labour charges for tools and plants and sterilising the equipments, paying all charges and fees, testing etc. complete in all respect as per direction.

Packing the annular space between the outside of the tube well pipes & strainers and the bore with pea size washed gravel of approved quality having size from 2 mm to 5 mm or the size approved by the Engineer-incharge including cost of all materials labour and equipment complete. Note: Initial 6 m. of Annular space between the housing pipe and the bore should not be shrouded with Pea size gravel to avoid contamination with surface water.

Packing annular space between the outside of the housing pipe and the bore with puddled clay balls of approved size as per direction of the Engineer-in-charge with cost of all materials and labour complete.