Tender For Sinking Of 5 Nos (Five) Rig Bored Tubewell By Down The Hole (D.T.H.) Method Of Drilling Of Size (200Mm X 165Mm) Of 300 Mtr. Deep) For Hatgacha Piped Water Supply Scheme In Mahammad Bazar Block Under Birbhum Division, P.H.E. Dte. (Sl.No.3)., birbhum-West Bengal

tender for Sinking of 5 Nos (Five) Rig Bored Tubewell by Down The Hole (D.T.H.) method of drilling of size (200mm x 165mm) of 300 Mtr. deep) for Hatgacha Piped Water Supply Scheme in Mahammad Bazar Block under Birbhum Division, P.H.E. Dte. (Sl.No.3) Sl. No. Item Description 1 Conducting geophysical survey for ground water potentiality and to evaluate the layer parameters in terms of depth by surface registivity technique adopting Vertical Electrical Sounding (VES) method for locating pin pointed location of tube well including charges for instruments & transportation thereof and services all complete at site and submission of data collected from each site foranalysis (For each site at least 3 nos. location are to be surveyed). a) for depth greater than 200 metres 2 Interpretation of VES data including analysis of data & interpretation of layer parameters and submission of report including expected yeild. 3 Mobilisation and transportion of the Rig machine and its accessories and others materials, etc. to the site. 4 Drilling bore hole in DTH method through any kind of soils and rocks in overburden suitable for lowering and fitting fixing of 200 mm dia. casing pipe ( casing pipe will be supplied by departmentally) up to an average depth of 25 (+/-) 5 mtrs. and subsequently 165 mm diameter boring through any kind of rocky formation upto a total depth of 170 mtrs (for dry drilling or sufficient water not achived, drilling may be continued upto 200 mtrs) including all other works necessary for boring and lowering, fitting, fixing of MSERW / UPVC casing pipes suitable for 165 mm dia drilling in rock bed and grouting the same as per direction of E.I.C. including (in case of MSERW casing pipes) the cost of welding of MSERW casing pipes and welding the top of the casing pipe with 1 no. 8 mm thick MS cover plate (with supply and delivery of the plate). Necessary arrangement to be made for proper security of bore hole.(Rates are inclusive of all materials necessary for drilling works).Note:- a) MSERW / UPVC casing pipes should be properly inserted or lowered in overburden zone for proper RBTW formation.b) In case of collapse in borehole, payment will be done for clear measurable depth only.a) 0 to 25 mtrs. 5 b) 25 to 170 mtrs. or above 6 Supply and delivery of UPVC pipe (CD) conforming to IS12818:2010. (CIPET Certified)c) 200 mm dia. 7 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 yeild in gallons per hour with V notch including hire and labour charges for all tools and plants and scaffolding as required. 8 Electro-logging charge. 9 Water sample collection and chemical test including Arsenic Test. 10 Supply and delivery of UPVC Capc) 200 mm dia. 11 Add GST @18% on sum of Item No. 1 to 10 12 Add Cess @1% on sum of Item No. 1 to 11

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