Special repair to borewell against BER at 19 Wing, AF under GE (AF) Borjhar

Excavation in trenches not exc 1.5m wide and not exc 1.5m in depth, for laying of cables/pipes and getting out in soft/loose soil, complete all as as directed.

Removing excavated soil/materials not exc. 50mtr and depositing where directed at level not exc. 1.5m, above the starting point complete all as specified and as directed.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exc. 25cm in soft/loose soil complete all as specified and as directed.

Material and labour for sand cushioning for under ground cable with locally available sand for protection of cable including spreading and consolidations, complete all as specified and directed.

Supply and laying in trenches dry well burnt locally available sub class “B” bricks over sand cushioning for protection of cable complete all as per specified and directed.

M & L for Electrologging test with using suitable equipments for the bore hole before sinking/lowering of pipes, filters etc., for assessing proper delineation of water by government recognized agency/Govt firm and report shall be submitted to GE for approval for work complete all as specified and as directed.

M&L for provn of 50mm dia PVC pipe upto 150 metre depth or as reqd below ground level in any kind of soil/strata & testing the water availability incl all necessary arrangements of reqd length and PVC filter as required & other connected fittings complete all as directed. Note : Making of bore hole shall be measured under item No. 10 to 14 here in after.

M&L for testing of raw water for all chemical parameters PH value, TDS, turbilidty, chlorine, redness, sulphate, iron, Arsenic, floride, nitrate & other organic impurities etc. & other relevant parameters as per IS 3025, IS 5402 & IS 15185 & testing from Govt approved laboratory & as approved by the GE & furnishing test report indicating all chemical & bacteriological analysis, presence of fluorine contents if any including ref permissible parameters all as directed.

Transportation of well drilling rig and equipment to work site for trial bore and development of tube well including erecting and dismantling of the same and return back after completion of work including M&L for Yield test for the bore well by continuously pumping for 16 hours to determine safe pumping yield as desired complete all as specified and as directed. Note : Contractor shall arrange reqd pump set (electric/IC driven) for testing of reqd yeild 17000 GPH & obtaining water sample for testing purpose complete. If reqd yield & quality not achieved by pumping out water, compressor cleaning etc shall continue to be done by contractor for obtaining desired result or depth of trial bore increase/ decrease to be suggested by the contractor for achieving the reqd yeild. The increase/ derease of trial bore depth pipe shall be measured in item No. 07 here in before & compressor cleaning to be paid in item No. 24 here in after.

Drilling and development of bore hole of 300mm dia for tube well by reverse rotary circulation method rig machine 25 inch bore size of top or bottom by different cutters including all arrangement with appliances incl using bentonite or silty clay as per site/soil condition for settlement of bore hole for the depth from ground level upto 30 metre, complete all as specified and as directed.