WB-PANCH/02/CGP/2025

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. (b) For depth upto 250 metre for 150 mm dia. Tube well with top enlargement of 250 mm dia.(upto 50 metre). (i) First 50 metre

(ii) Next 50 metre

Supplying, fibre glass reinforced Epoxy resin slotted of 1 mm slot width in 6.1m length of approved make and as per direction of the Engineer - in Charge (b) 150 mm nominal dia (ii) 7.00 mm wall thickness

(A) Sypply of E.R.W.M.S.(Electrical Resistant Welded M.S.) black pipe of of TATA make (heavy quality) as per standard specification, 5 mm thick. (ii) 150 mm dia. (internal)

Washing and developing tube well with air compressor pump and engine for 8 (eight) hours continuous pumping per day with necessary arrangements for testing the yield in gallons per hour with 'V' notch including hire and labour charges for all tools and plants and scaffolding as required.

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.

Providing 200 mm centre guide. i) With Clamp

Supplying, fitting and fixing special hand pump no. 6 of approved make (for 50 mm or 40 mm dia. tube well).

Supplying, fitting and fixing 65 mm dia. deep well brass cylinder with necessary fittings and accessories.

(II)Cementconcretewith30mmdowngradedshinglesexcluding shuttering. N.B. Variety (a) 1:3:6 Proportion

Digging earth in any soil including mixed soil but excluding moorum, laterite sand stone or any other hard stone including spreading or stacking the spoils within a lead of 75 metres as directed bailing out water upto 1 metre depth, shoring etc., when and if required and back filling with fine sand (including cost of sand) on completion of steining works. A) R.C.C. Ring Well i) 1.2 metre diameter of digging for 0.9 metre internal diameter of well ring. a) Upto 3 metre below G.L.

R.C.C. well ring made with cement concrete 1:1.5:3 with stone chips and 0.80% reinforcement (including the cost of shuttering and reinforcement) cast at site fitted and fixed in position after proper curing true to plumb in the well including jointing with cement mortar 1:2 complete as per direction. a) 65 mm thick and 0.9 metre internal dia.

Sinking Precast R.C. well ring made with cement concrete 1:2:4 with stone chips and necessary reinforcement fitted and fixed in position true to plumb including all labour and hire charges of tools and Plant complete as directed and jointing rings with cement mortar (1:2) (a) 90 cm dia (internal)