Name of Work: Core drilling in respect of 186 MW Tato-I Hydro Electric Project, Shi-Yomi District, Arunachal Pradesh
Sl. No.
Item Description
1
Mobilisation of boring equipment, personnel and all other necessarymachinery/accesories for boring works including any platform required for drilling work, transportation, shifting of equipment to site etc., all complete
2
Demobilisation of boring equipment, personneland all other necessary machinery/accessories brought for boring works including any platform required for drilling work, shifting of equipment from site, transportation etc., all complete
3
Shifting to the bore hole location: Shifting of boring equipment to all bore hole locations for boring works including assembling and dismantling of rigs etc.
4
Boring through all kind of soils with adequate/suitable equipment and approved method of boring and providing casing pipe as required and as per directions of the Engineer-in-Charge, for depth measured below existing ground level using triple tube core barrel
5
Boring through rock strata (both soft and hard rock) using hydraulic rigs at any depth with double/triple tube core barrel including collecting of cores in core boxes, determining core recovery (CR), rock quality designation (RQD), parameters for RMR assessment as per specifications and presentation of drilling information and core description as per IS Code 4464:2020
6
Conducting standard penetration test (SPT) (As per IS: 2131) and collecting distributed soil samples at every 1.5 meter at the change of strata at depth wherever undisturbed soil samples could not be collected, at depth of discontinuity on encountering of rock/at depths of borehole termination
7
Permeability test in overburden and rock at every 3.0 meter interval by appropriate method as per BIS guidelines
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