Ambala Sadar, Installation of tubewell Dalipgarh Urban W S Installation of tubewell on labour rate by Reverse Rotary Rig and all other works contingent thereto, according to ISI.

Amount

Drilling of 609.60mm dia bore by hydraulic rotary drilling (reverse circulation method) percussion rig according to ISI specification No. 2800-1991 (Part-I) as amended upto date and modified to extent of the specification attached with this schedule of items of work in all kinds of soils and boulders upto 125 mm dia except rocky strata including the cost of all consumable stores, fuel, oil, soil stabilizing material and transportation of rig and other accessories to the site of proposed bore and back including cost of lowering of all size of casing pipe while boring & extracting the same against earth friction etc. complete to the satisfaction of the Engineer-in-charge.

Labour for lowering 219.10mm outer dia ERW steel pipes as per IS 4270/1992 as amended upto date, duly ISI marked for housing pipe in 4 to 7 Metres random length with 88.90mm of threaded ends (8 threads to an inch or 25.40mm) manufactured out of 6.40mm thick M.S. plates with required number of M.S. socket 177.80mm with inside thread to match the pipe threads and made out of M.S. plate in to borehole in vertical position including cost of all scaffolding, derricks, Jim, poles, tools and plants, ropes, guys M.S. clamp embedded in foundation etc. complete in all respects to the satisfaction of the Engineer-in-charge of the work including cost of all cutting, threading of pipe, welding, where required and all sockets. The pipe shall be painted with corrosive paint and covered tightly with polythene.

Labour for lowering 200mm i/d all welded S.S. Screen cage type V-wire wound screen conforming to ISI 8110-2000, IS : 4270-1992 and compositions of material as per ISI : 1012 of outer dia 221 mm equivalent thichness 8.00mm, tensile load 14000 kg minimum and ring thickness 8mm, slot opening 0.75mm, open area 25%.

Providing and fixing in position suitable bail plug hook of 219.10mm as per IS 226/1975 as amended upto date, including the cost of M.S. Screwed sockets etc. complete in all respects to the entire satisfaction of the Engineer-in-charge of the work.

Supplying and packing graded gravel of size as per ISI 4097/1988, as amended upto date and specification attached with this schedule of item of work. The gravel should be free from dust, dirt or vegetable matters. Packing to be done from the housing pipe to the bottom of liner all around in the bore and will be placed after liner and housing pipes have been lowered and suitably clamped. Thickness and size of the gravel packing will be designed & directed by the Engineer-in-charge strictly as per relevant ISI.

Supplying and fixing well threaded M.S. cap for 219.10mm outer dia M.S. pipe as per ISI 226/1975 as amended upto date to the satisfaction of the Engineer-in-charge.

Supplying and fixing 219.10mm M.S. clamp as per IS 226 / 1975 as amended up to date for supplying the housing pipe supported on two girders not less than ISMB 100mm x 150mm, weight not less than 17.00 kg / m, cross section area not less than 21.67 sq. cm, flange thrickness 7.00mm, web thickness 5.40mm, 2.00 m long (each) embedded in suitable foundation as approved by the Engineer-in-charge.

Development of tubewell according to clause 9.3 of IS: 2800-1991 (Part-I) as amended upto date and specifications attached and as directed by the Engineer-in-charge of the work including the cost of all consumable stores, fuel, oil, compressors, pumps and machinery etc. as required for this work. When developed by compressor of 450 CFM, 250 PSI of suitable rating.

Providing clay seal of thickness 4.00 m or above, consisting of balls of local clay or bentonite mud, to be placed in the annular space around the assembly. The clay seal should be provided at a level of minimum 25.00 m above the top most screens, depending on the logging results. This item is to be included when ever is necessary).

Electric logging of tubewell.

Providing and fixing centralizer guides (centralizer) fitted to the well assembly except the housing pipe, at bottom and at a spacing of 12 m centre to centre, to keep the assembly in centre of the bore hole as per approved design and specifications, confirming to IS : 226/1975.

M R CONSTRUCTION COMPANY