Development of 25 Nos. of borewells in the DDA green belt along Western Yamuna Canal for the supply of water in Sector 36 and37, Rohini.

Civil Work Conducting Integrated Hydraulogical and geophysical investigations by conducting Vertical Electrical Sounding(VES) minimum 02 nos. of points using latest digital DCR meters to delineating the sub surfacehydrological,geological,geochemical framework.The work shall include initial dematcation of potential zones based on hydrological assesment of the area followed by resistivity data collection.The agency shall have to submit detailed investigation report reflecting-1.Location point for drilling 2. The soil starata likely to be encountered 3.The general expected quantity & quality of ground water 4. Depth of bore for attaining required quality and quantity of water including other necessary information.

Boring/drilling bore well of required dia for casing/ strainer pipe, by suitable method prescribed in IS : 2800 (PART I) , including collecting samples from different strara, prepairing and shuttering strata chart/ bore log, including hire & running charges of all equipments, tools, plants & machineries required for the job, all complete as per direction of Engineer-in-charge, upto 90 metre depth below ground level.All types of soil 600 mm dia

Supplying, assembling,Iowering and fixing in vertical position in borewell, ERW (Electric Resistance Welded) FE 410 mild steel screwed and socketed/plain ended casing pipes of required dia, conforming to IS: 4270, of reputed & approved make, including painted with outside surface with two coats of anticorrosive paint of approved brand and manufacture, including required hire & labour charges, fitting& accessories, all complete , for all depths,as per direction of Engineer-in- charge. 300 mm nominal size dia having minimum wall thickness 5.40 mm

Supplyinp•, assemb1ing,lowering and fixing in vertical position in bore well, ERW (Electric Resistance Welded) FE 410 plain slotted (having slot of size 1.6/3.2 mm) mild steel threaded and socketed/plain bevel ended pipe (type A) of required dia, ended casing pipes of required dia, conforming to IS: 8110, of reputed and approved make, having wall thickness not less than 5.40 mm, including painted with outside surface with two coats of anticorrosive bitumestic paint of approved brand and manufacture, including required hire & labour charges, fitting & accessories, all complete, for all depths, as per direction of Engineer -in-charge. 200 mm nominal size dia

Gravel packing in tubewell construction in accordance with IS: 4097, including providing gravel fine/ medium /coarse, in required grading & sizes as per actual requirement , all complete as per direction of Engineer-in-charge.

Development of tube well in accordance with IS : 2800 (Part I) and IS: 11189, to establish maximum rate of useable water yield without sand content (beyond permissible limit), with required capacity air compressor, running the compressor for required time till well is fully developed, measuring yield of well by “V” notch method or any other approved method, measuring static level & draw down etc. by step draw down method, collecting water samples & getting tested in approved laboratory, including disinfection of tubewell, all complete, including hire & labour charges of air compressor, tools & accessories etc., all as per requirement and direction of Engineer-in-charge.

Providing and fixing suitable size threaded mild steel cap or spot welded plate to the top of bore well housing/ casing pipe, removable as per requirement, all complete for borewell of: 200 mm dia

Providing and fixing M.S. clamp of required dia to the top of casing/housing pipe of tubewell as per IS : 2800 (Part I) , including necessary bolts & nuts of required size complete. 200mm clamp

Providing and fixing Bail plug/ Bottom plug of required dia to the bottom of pipe assembly of tubewell as per IS:2800 (part I).

Earth work in excavation by mechanical means (Hydraulic excavator) / manual means in foundation trenches or drains (not exceeding 1.5 m in width or 10 sqm on plan), including dressing of sides and ramming of bottoms, for all lift, including getting out the excavated soil and disposal of surplus excavated soil as directed, within a lead of 50 m.