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| 1 | Core drilling in rock including overburden using hydraulic feed rotary drill and double tube core barrel with diamond bit including collection of core samples, maintaining continuous record of core recovery/ RQD, keeping the cores in wooden core boxes, transporting to laboratory, providing cap on top on completion of drilling, all complete as per the specification and instruction of the Engineer in Charge. |
| 2 | NX size drill hole (total 5 no. of holes of varying depth at different locations in project area). |
| 3 | Upto 20 m depth |
| 4 | From 20m to 40 m depth. |
| 5 | From 40 m to 60 m depth |
| 6 | From 60 m to 80 m depth |
| 7 | From 80 m to 100 m depth |
| 8 | From 100 m to 120 m depth |
| 9 | From 120 m to 140 m depth |
| 10 | From 140 m to 160 m depth |
| 11 | From 160 m to 180 m depth |
| 12 | From 180 m to 200 m depth |
| 13 | From 200 m to 220 m depth |
| 14 | Above 220 m depth. |
| 15 | Recovery of cores @ 80 % of total drilling. |
| 16 | Excavation of exploratory Drift at right bank of dam axis (total length 50 m)size 2.2. x 1.5 m. Providing Support System wherever required, all complete as per specification and instructions of the Engineer in charge. |
| 17 | Reach (upto 100 m) |
| 18 | Without support |
| 19 | With Support |
| 20 | Excavation of exploratory Drift in powerhouse area (total length 320 m, out of which 190 m completed and 130 m remaining) size 2.2. x 1.5 m. Providing Support System wherever required, all complete as per specification and instructions of the Engineer in charge. |
| 21 | Reach upto 100 m |
| 22 | From 100 to 200 m |
| 23 | Without support |
| 24 | With Support |
| 25 | From 200 to 300 m |
| 26 | Without Support |
| 27 | With Support |
| 28 | From 300 to 400 m |
| 29 | Without Support |
| 30 | With Support |
| 31 | For permeability and groutability tests, NX size drill holes as primary, secondary, and, if required, tertiary (based on the results of the WPT) are to be carried out on both banks near river. Total two sets of drill holes are required, with each set consisting of 6 to 7 holes, subject to WPT results. The depth of each drill hole shall be 91.5 meters. Total 12 to 14 holes are required. |
| 32 | From 0 to 20 m depth |
| 33 | From 20 to 40 m depth |
| 34 | From 40 to 60 m depth |
| 35 | From 60 to 80m |
| 36 | From 80 to 100m |
| 37 | Recovery of cores @ 80 % of total drilling. |
| 38 | Dismantling, shifting and assembling of drilling machine and accessories of drilling machine from hole to hole. |
| 39 | Permeability test in the drill hole using single or double packer method with 1.5 to 3 m test section including all machinery, equipment, manpower and material, complete as per specification and instructions of the Engineer in charge. |
| 40 | Groutability test in the drill hole using single or double packer method with 1.5 to 3 m test section including all machinery, equipment, manpower and material, complete as per specification and instructions of the Engineer in charge. |
| 41 | Sub Total |
| 42 | Additional 5 % of total provision to cover Unforseen expenditure. |
| 43 | NOTE: Excluding EPF, ESI and GST |
