Provision of Borewell alongwith recharge Pits and connected items at NOFRA I under GE Gomantak Vasco

Excavation in trenches not exceeding 1.5 m wide and not exceeding 1.5 m deep in hard/dense soil for foundation, etc. or for laying of pipe line/ cable etc. n exc 10 sqm on plan and getting out complete all as specified and as directed.

Returning filling in including spreading levelling, watering and well ramming in layers n.exc 25 cm thick in any type of soil/rock complete all as specified and directed.

Removing excavated material (Soils/rock) to a distance not exceeding 50 m and depositing where directed at a level n.exc. 1.5 m above the starting point complete all as specified and directed.

Supply & laying double walled corrugated (DWC) HDPE full rounded pipe conforming to IS 16205 Pt-24 of approved colour complete with fittings for cable protection of size 50 mm inner dia and 63 mm outer dia complete all as directed.

Providing, drilling and carrying out a trial bore of 200 mm diameter up to a depth of 140 metres below ground level, through all types of soil strata, including hard strata, hard rock, boulders, etc., complete in all respects, as specified and as directed by the Engineer-in-Charge, including all necessary labour, tools, plant, machinery, equipment, consumables and incidental works. Note: In the event of failure of the first trial bore to achieve the required objective/depth due to any unforeseen geological or site condition, a second trial bore shall be permitted and shall only be measured and paid separately.

Development of trial bore by drilling and reaming up to 200/250 mm diameter, to a depth of 66 (33 + 33) running metres (RM) below ground level, including setting up and shifting of drilling equipment, boring through all types of strata, removal of drill cuttings, supplying, lowering and fixing of 200 mm diameter MS casing pipe of approved quality and required thickness, including cutting, threading/welding and jointing of casing pipes, wherever required complete all as specified and directed.

Development of trial bore by drilling and reaming up to 200/250 mm diameter, to a depth of 66 (33 + 33) running metres (RM) below ground level, including setting up and shifting of drilling equipment, boring through all types of strata, removal of drill cuttings, supplying, lowering and fixing of 200 mm diameter MS ribbed screen pipe of approved quality and required thickness, including cutting, threading/welding and jointing of casing pipes, wherever required complete all as specified and directed.

M&L for fixing of MS reducer, bail plug, well cap, MS strip for centring, MS iron clamp, electric logging and sample strata box including providing 100 mm thick PCC 1:3:6 type C-1 using 20 mm graded stone aggregate around the borewell minimum 2 m radious complete all as specified and as directed

M&L for development of one tubewell by compressed air and subsequent pumping with a pump of 25% higher capacity than the designed discharge of the tubewell, including all necessary arrangements for airlifting, surging and pumping of muddy/turbid water, removal of sand, silt and other loose material from the tubewell, and continuous pumping until the water becomes substantially clear and the tubewell is properly developed and yields water at the required discharge, complete in all respects as directed

M&L for conducting a yield test of the borewell by continuous pumping for a period of 3 (three) hours to determine the safe yield/discharge of the borewell. The test shall be carried out strictly in accordance with the applicable standard procedure, including measurement and recording of discharge, pumping water level, and static water level at prescribed intervals complete all as directed.