Augmentation of Water Supply Scheme Chatterhama by way of construction of Additional Bore Well.

Boring/drilling 200 mm dia. Bore well and simultaneous lowering of casing/strainer pipe, by DTH/ODEX method prescribed in IS: 2800 (Part I), by fixing casing drive shoe including observing of samples from different strata, preparing and submitting strata chart/bore log, including hire and running charges of all equipment tools plants and machineries required for the job, all complete as per direction of Engineer-in-charge upto 90 m depth below ground level.

Boring/drilling 200 mm dia. Bore well and simultaneous lowering of casing/strainer pipe, by DTH/ODEX method prescribed in IS: 2800 (Part I), by fixing casing drive shoe including observing of samples from different strata, preparing and submitting strata chart/bore log, including hire and running charges of all equipment tools plants and machineries required for the job, all complete as per direction of Engineer-in-charge, beyond 90 m and upto 170 m depth below ground level.

Supplying, assembling, subsequent lowering and fixing in vertical position in above bore using ODEX method by double layer welding, ERW FE 410 M.S plain, bevel ended casing pipe of 200 mm dia. Having wall thickness not less than 6.40 mm and conforming to IS: 4270. The casing pipes supplied should be of reputed and approved make supported with manufacturers latest test certificate including painting of outside surface with two coats of anticorrosive paint and required hire & labour charges, fitting and accessories, all complete for all depths. The job includes Fabrication, flushing of holes in the pipes as per strata of the bore.

Development of the tube well in accordance with IS: 2800 (Part-I) and IS: 1189 to establish maximum rate of usable water yield without sand contents with required capacity of air compressor run for required time till well shall be fully developed. The job includes measuring static water level, draw down and safe yield not less than 4000 GPH using step draw down method by lowering of suitable capacity of submersible pumping unit run on DG set till the turbidity level comes below 5 NTU and safe yield is achieved. Moreover, collecting the water sample from the explored well and shall be tested at PHE central laboratory after disinfecting the bore well. The complete job shall include hire and labour charges of air compressor, DG set, pumping unit along with column pipes, starter, cable, tools and accessories etc required at site for harnessing.