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| 1 | Geophysical Survey selecting borewell point At site pointed charges |
| 2 | Drilling of Borewells anywhere in Tamilnadu including transportation from one place to another with in Tamilnadu in alluvial soil sedimentary strata of clay and sand stone shale pebbles boulders etc. By first taking a pilot bore of 140 mm/150mm dia and then enlarging to required dia direct or reverse rotary mud circulation method using rotary rigs, fuel, labour and drilling bentonite and water required for drilling at site ( Site will be shown by the TWAD Board Officers) including construction of mud pit. (SOR VOL II 2024-25 P.NO 198) |
| 3 | a) Upto 60m depth below GL - WD-W0783 |
| 4 | b) From 60m to 90m below GL - WD-W0784 |
| 5 | c) From 90m to 120m below GL - WD-W0785 |
| 6 | d) From 120m to 150m below GL - WD-W0786 |
| 7 | e) From 150m to 180m below GL - WD-W0787 |
| 8 | Reaming 140/150 mm dia pilot bore to 300mm dia bore as directed by theOfficer. (SOR VOL II 2024-25 P.NO 199) |
| 9 | a) Upto 60m depth below GL - WD-W0794 |
| 10 | b) From 60m to 90m below GL - WD-W0795 |
| 11 | c) From 90m to 120m below GL - WD-W0796 |
| 12 | d) From 120m to 150m below GL - WD-W0797 |
| 13 | e) From 150m to 180m below GL - WD-W0798 |
| 14 | Reaming 300 mm dia pilot bore to 400mm/ 450mm dia bore as directed by the Officer. (SOR VOL II 2024-25 P.NO 200) |
| 15 | a) Upto 60m depth below GL - WD-W0816 |
| 16 | b) From 60m to 90m below GL - WD-W0817 |
| 17 | c) From 90m to 120m below GL - WD-W0818 |
| 18 | d) From 120m to 150m below GL - WD-W0819 |
| 19 | e) From 150m to 180m below GL - WD-W0820 |
| 20 | conducting Electrical logging test including Transporting charges. |
| 21 | Supply delivery and conveyance of PVC pipes and specials at site(SOR VOL II 2024-25) |
| 22 | a) 200mm PVC plain pipe (CM) - WD-M0031 |
| 23 | b) 200mm PVC Ribbed screen pipe - WD-M0032 |
| 24 | Labour Charges for inserting PVC Casing pipes assembly (with slots or without slots) in the drilled hole including jointing the pipes with PVC Couplers with Cement paste etc., complete, supply and packing the annular space with pebbles of size and quality as approved by the executive engineers in charge (SOR VOL II 2024-25 P.NO 201 WD-W0831) |
| 25 | 200mm casing pipe |
| 26 | Charges for developing the borewell with air compressor of 600 CFM capacity (Minimum 8 Hours) including transportation labour and fuel charges for compressor as directed by TWAD Board Officers and conducting yield test by \"V\" notch method. (SOR VOL II 2024-25 P.NO 201 WD-W0833) |
