Geo Technical Investigation of 24 MW Karbi Langpi Middle II

Amount

Mobilization charges of staff & machinery to work site including shifting to first drill hole (complete drilling units with accessories and test equipment up to motorable Road).

Shifting of drilling machine from hole to hole (after initial hole) & motorable road to BH Point and back from last hole to motorable road.

Providing and Supply of Core Boxes of 1.5m long having max of 5 compartments to preserve samples with standard painted metal/wooden core boxes for storage soil and core sample as per IS specifications and shifting of the core boxes to the office of concerned PMC/Client (IS 4078).

Drilling NX size drill holes through all type of strata with diamond bits and Triple/Double Tube Core Barrels ensuring >85% core recovery at different location shown in the relevant drawings or as directed by the engineer or his authorized representative. Erection of rigs at bore hole locations, preparation of platform, lifting of cores in good condition and proper order, arranging them properly in core boxes with proper depth, markings, lifting all parts from the underground & dismantling the same after drilling operation is over, as per IS code. The rates include the cost of all labours, machine charges, drill bits, core barrel casing pipes, fuel, lubricants, water. Supply of core boxes and preservation of cores in core boxes and Geological field logging.

Drill holes in Overburden from 0m to 20m depth

Drill holes in Rock from 0m to 50m depth

Drill holes in Rock from 50m to 100m depth

Installation PVC pipes and covering with cap

Test in Bedrock- Conducting Permeability (Packer pressure) tests in drill holes at elevation as advised by engineer and as per IS:5529-part-II (tests in rock). Each set of tests shall be conducted at 3 .0m interval of drill holes under different pressure suitable for rock formation. a) Using Double Packer System b) Using Single Packer System

Test in Overburden- Conducting permeability (Falling head/constant head) tests in drill holes at 1.5/3.0m intervals as per IS :5529 -part- (test in overburden)

Standard Penetration Test (SPT) shall be conducted in 150mm dia. of boreholes using split spoon sampler (SPT) for the bore holes. Test shall be conducted in boreholes at Interval of 1.5m and wherever strata is changing. Test shall be discontinued when the blow count is equal to 100 or drilling 3m into hard strata whichever is earlier (IS 2131).

Progressive geological logging of drilled cores.

Preparation of Report and Submission Draft Report with soft copy of the same.

Geo-Physical Surveys with Electrical Resistivity Tomography (ERT) and Seismic Refraction Tomography (ERT/SRT) for determining Sub-surface material properties

Bidder Name

Amount in Words

Relaint Foundations

Techno Enterprise

Genstru Consultants Private Limited

ARK GEO DRILL ENTERPRISE

Genstru Consultants Private Limited

ARK GEO DRILL ENTERPRISE

Relaint Foundations