SPECIAL REPAIR/ REPLACEMENT OF BORE WELL AT 5AFH UNDER GE (AF) JORHAT

Ground water survey and resistivity test for bore well to locate and identify the suitable site (point) for potable and good yield water by any Government or Govt approved agency by geologist and report to be submitted and approved by GE before drilling the borewell complete all as specified and as directed.

M&L for drilling of bore well by deploying required plant and machinery for boring 200mm dia size pilot bore through any kind of soil / strata including hard stone/boulder by direct rotary method up to and including 60 metre depth below ground level complete all as specified and as directed. Note : 01 (one) trial hole to be done at site and rate for the same as deemed to be included in the quoted rate complete all as specified and as directed (Each Bore 60m).

All as per Serial item No. 2 here-in-before but for depth from 60 metres below ground level up to 90 metres depth (Each bore 30 metre).

All as per Serial item No. 2 here-in-before but for depth from 90 metres below ground level up to 120 metres depth (Each bore 30 metre).

Development of trial bores by reaming 525mm dia for 60 metre depth from ground level complete all as specified and directed. (Each bore 60 metre) complete all as specified and as directed.

All as per Serial item No. 5 here-in-before but for depth from 60 metres below ground level up to 90 metres depth (Each bore 30 metre).

All as per Serial item No. 5 here-in-before but for depth from 90 metres below ground level up to 120 metres depth (Each bore 30 metre).

M&L for developing the tube well with 300 PSI, 450 CFM capacity air compressor as required until clear water is obtained including transportation, errection and dismantling of air compressor. Time for devloping the tube well be not less then 08 hours per borewell complete all as specified and directed by Engr in charge. Note : Compressor, pump, pipe and other allied items will be arranged by contractor and quoted rate shall be deemed to be all inclusive. No extra payment admissible.

Developing tube well with compressed air and after with 25% extra capacity pump by pumping muddy water along with required plants and equipments tools and sockets till sand free water of potable quality complete all as specified and as directed.

Yield test for the borewell by applying V-Notch method with continuously pumping for 16 hours to determine safe pumping yield including draw down test, verticality test and aquifier performance test and chemical including biological test from a Govt testing laboratory complete all as specified and as directed.