Carrying out the work of Geo-technical investigations

Amount

Locating bore hole, shifting &Setting up of drilling equipment at each of the drill locations within Kaiga 5&6 township area, including following activities: 1. Conducting survey and locating the borehole as per the drawing or as directed by engineer in charge. The location of the borehole to be identified based on the coordinates provided in the drawing by transferring the coordinates from the marked-up points given in the drawing/ shown by Engineer along with grid / bench mark. The distance of survey traverse will not be more than 2 KM. Use of GPS instrument for locating bore holes will not be acceptable, however it may be used as a confirmatory system only. 2. Making temporary access roads as required to the boring/ drilling locations from existing approach roads to site. 3. Arranging water supply for the drilling and testing. 4. This item shall be operated only once for each bore hole. Any replacement or change of equipment needed due to any reasons, contractor shall carry out at his own cost. 5. Required Site clearance, earthwork etc. suiting for mounting of the equipment and creating working environment. 6. No extra payment shall be made for any crisscross or back and forth movement of the rig after setting, required for proper positioning, including marking the drill hole location on ground by actual survey, as per the drawing or instructions of the Engineer in charge.

Rotary boring/ drilling of ‘SX’ size holes vertically to log and collect samples through all kinds of soil mixed with boulders/pebbles with adequate and suitable equipment for all depths below existing ground level as per specifications, drawings and as directed by the Engineer. The quoted rate shall include the following: 1. Mobilization and Demobilization of adequate numbers of suitable boring and drilling rigs of hydraulic type, including necessary drilling rods, pumps, miscellaneous equipment, tools, spares, consumables etc. adequate for each set of plant, survey equipment, etc. Additional rigs and equipment shall be mobilized by contractor, if needed, for timely completion of the work at his own cost. 2. Deployment of technical, skilled, semiskilled & unskilled man power required for carrying out the complete work as per specifications & drawings. 3. Providing suitable temporary removable casing for ensuring stability of boreholes in soil/ weathered rock. 4. Measurement of ground water level as per specifications & drawings. 5. Maintenance of drilling records and submission of final geological logs in hardcopy as well as soft copy. 6. Conducting Standard Penetration Test (SPT) in the bore holes in soil @ every 3.0 m depth or any change of strata. 7. Soil sample to be placed in core boxes as directed. 8. Minimum 5m drilling in hard rock.

Same as item no. 2 of this schedule rotary drilling with NX size holes in rock formations (excluding carrying out SPT) including collection, numeration and logging of cores, placing of core samples in the boxes, labelling of cores samples, placing inside the core boxes as per relevant IS Code. Transporting and storing at core sample library at location indicated by engineer (within 3 Km radius), measurement of ground water level etc. complete as per specifications & drawings. Rotary drilling for following depth:

From GL to 20 m below GL

Obtaining Undisturbed tube / piston soil samples, 90 mm diameter & 450 mm long from all depths of the drilled boreholes, necessary sealing and transporting the same to testing laboratory as per specifications and as directed by the engineer. Collection of undisturbed samples may require deployment of special samplers depending on the soil type encountered.

Plugging of bore holes as per specifications and as directed by Engineer-In-Charge using 1:2 cement-sand grout. Note: 1. The grouting of the hole shall be done using a tremie extending up to bottom of the hole and raising the same as the grouting proceeds. 2. The payment will be made in running metre for the depth of bore hole plugged.

Laboratory Tests on Soil samples Conducting Grain size analysis, particle size & percent fines distribution of soil and soil classification (IS 1498), (Sieve analysis & Hydrometer or Pipette analysis) including Grain Size Distribution curve as per drawings, specifications, IS 2720 (part-4) and as directed by the Engineer.

Finding out Atterberg Limit of soil such as Liquid limit, plastic limit and plasticity index etc as per drawings, specification, IS 2720 (Part 5), IS 9259 and direction of the Engineer. Three tests of each soil sample will be considered as one set.

Conducting Specific gravity as per specification, drawings, IS 2720 (Part 3) and as directed by the Engineer. Three tests of each soil sample will be considered as one set.

Conducting chemical analysis of undisturbed soil samples or disturbed SPT soil samples including total soluble solids , organic matter , Calcium carbonate , cation exchange capacity , silica sesquioxide ratio , sulphates (expressed as SO3), Chlorides and PH as per drawing, specification, IS 2720 ( Part 21,22,23,24, 25, 26, & 27) and as directed by the Engineer.

Conducting Permeability test on undisturbed soil samples (constant or variable head type) as per drawing, specification, relevant IS codes and instructions of the engineer.

Conducting Consolidation test on undisturbed soil samples, giving full test results including e - log p curve, virgin curves, Cv ,e, av, Cc , etc as per drawing and relevant IS code:2720 Part 15.

Conducting unconfined compressive strength test on undisturbed soil samples or remoulded soil samples as per IS: 2720 Part-10

Conducting triaxial compressive strength test on undisturbed soil samples or on remoulded soil samples as per drawings, specifications, relevant IS 2720 (Part-11 & 12) and as directed by the Engineer,

Unconsolidated undrained type

Consolidated undrained type including measurement of pore water pressure.

Consolidated drained type

Conducting direct shear test on undisturbed soil samples or on remoulded soil samples as per drawings, specifications, relevant IS 2720 (Part-13) and as directed by the Engineer,

Un drained type

Consolidated un drained type

Consolidated drained type

Conducting vane shear test on undisturbed soil samples or on remoulded soil samples as per drawings, specifications, relevant IS 2720 (Part-30) and as directed by the Engineer.

Conducting CBR test on soil samples as per drawings, specifications, IS 2720 (Part 16) and as directed by the Engineer.

Laboratory Tests on ground water samples Collecting ground water samples as applicable at specified depths from drill holes (minimum 2 litres) and conducting full chemical analysis of water sample as per relevant IS code in an approved laboratory, complete as per drawing, specifications, including submission of test reports. The following tests are to be conducted: Determination of turbidity. • PH Value determination. • Alkalinity determination. • Arsenic determination. • Chlorides content determination. • Sulphates content determination. • Nitrites content determination • Nitrates content determination • Fluorides content determination • Free & Saline ammonia content determination. • Determination of hardness. • Bacteriological analysis

Laboratory Tests on Rock Core samples Carrying out laboratory tests on rock samples in an approved laboratory, complete as per specifications and as directed by Engineer-In-Charge, including necessary transportation of samples to approved laboratories and submission of test report in hardcopy as well as soft copy.

Natural moisture content

Dry Density and Specific Gravity

Uniaxial compression test to determine unconfined compressive strength, Young's Modulus E and Poisson's ratio

Tensile test by Brazilian method as per IS 10082

Tensile test by Point load method as per IS 8764

Conducting Triaxial compression strength with internal pressure up to 80 kg/cm2 as per relevant IS Code. Note: For measurement, one set means 3 samples with 3 different confining pressures.

With saturation

Without saturation

Determination of Water absorption and Porosity as per relevant IS Code.

Conducting Chemical analysis as per relevant IS Code.

Detailed Petrographic examination of core including grinding thin sections for study under electronic microscope analysing strained quartz, taking photo (micro-graphs) of sections etc. Complete for including in the report and submission of report.

Field Tests: Conducting static plate load test on soil as per IS 1888 up to a depth of 5m at specified locations up to an ultimate load of 100 t/sq.m, for determining safe bearing capacity and Modulus of sub grade reaction as per IS: 9214 at various locations and depths as per drawings, specifications and as directed by the engineer, up to failure The quoted rate shall be inclusive of preparation of the test surface, making access, mobilization and demobilization of all equipment, anchors, trusses, Kent ledge and jacks for tests etc., all materials, suitable & adequate skilled, semiskilled & unskilled personnel etc. all complete as specified and required for executing the works under the scope of this item. This pit shall be used as a trial pit. The pit shall be used to take samples, colour photographs, indexing, location of sample, date of sampling etc.

Conducting field CBR test as per IS: 2720 (Part-31) at 1.5, 3.0 and 4.0 m depths below existing ground level, complete as per drawings, specifications and as directed by engineer (Conducting the test at all the three specified depths at one location is treated as one set). The quoted rate shall be inclusive of preparation of the test surface, making access, mobilization and demobilization of all equipment, anchors, truss, Kent ledge and jacks for tests, all materials, suitable & adequate skilled, semiskilled & unskilled personnel etc. all complete as specified and required for executing the works under the scope of this item.

Report submission of Geo-technical investigations, Geo-physical investigations, field tests, Lab tests and Foundation parameters: Preparation and submission of comprehensive draft (2 Copies) and final (3 copies) reports of all the tests, field investigations, laboratory tests etc. in the scope of this tender as detailed in various schedules, specifications, drawings inclusive of bore logs, Compilation, interpretation, analysis of the data, recommendations of the foundation design parameters found out from the tests, survey and investigations in the area. All the draft, final reports and the number of copies at various stages shall be submitted as per specification. The reports shall be proof checked by a renowned geotechnical expert from IITs/IISc/NIT having ME/M. Tech. in relevant field with minimum 10 years of experience, to be approved by the Engineer. The expert shall also finalise the requirement of geo-technique investigation to be carried out. The scope of works also includes study and preparing design and drawings for slope stabilisation of hillocks wherever required. The rate is inclusive of faculty’s visit to NPCIL Kaiga5&6 construction site as and when required.

CEG Test House And Research Centre Pvt. Ltd.

GEOSERVICES MARITIME PVT LTD

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