Topographical Survey and Geo-Technical investigation works

Amount

ANNEXURE-1: TOPOGRAPHICAL SURVEY WORK

Traverse and topographic survey within the survey limit as shown in the tender drawing no “TCE.13309A-CV-3000-SI-30001” or as directed at site, including taking spot levels at 25 m or at closer intervals as necessary, plotting contours at 0.25m intervals, setting up of base zero and grid lines, survey of on/overground features, roads, railway tracks, drains, overhead pipe lines, power lines etc., complete in all respects, as specified and as directed

Setting out, construction and levelling benchmark/grid pillars as shown in the tender drawing or as indicated at site, complete in all respects.

Submission of three (3) prints of each sheet of final survey drawings as specified,together with two soft copies in separate CDs.

ANNEXURE-2: GEOTECHNICAL INVESTIGATION

MOBILISATION

Mobilization of hydraulic boring and drilling rig with suitable casing up to desired depth, other in-situ test equipment, personnel etc. for carrying out investigations on land and demobilization on completion of work and removal from site.

FIELD INVESTIGATION

Setting up of boring rig at each borehole location including moving between borehole positions, locating, and marking the location on the ground by actual survey (by using precision position instruments such as GPS and Total Station), setting up all field test equipment and bringing all personnel to the location, making area good for setting up rig etc. complete all as per the IS Specification and as directed by Engineer. Any criss-cross or back and forth movement of the rig can take place. No additional compensation will be paid for such movements. The break-ups for 40 Nos Boreholes of 20m and 15m depths (Total 650 RM) are given below:

Boring vertically through all kinds of soils, weathered rock, and soft rock with suitable and adequate equipment of diameter 150mm or 200mm, for depths as measured below existing ground level at rig location etc. all as per the IS Specification and as directed by Engineer:

0-10m This shall include collection of disturbed samples at every change in stratum and preserving the same in airtight container with proper labelling for conducting required laboratory tests.

10-20m This shall include collection of disturbed samples at every change in stratum and preserving the same in airtight container with proper labelling for conducting required laboratory tests.

Drilling vertically through boulders and hard rock strata using NX size diamond bit, using triple tube core barrel with suitable core catcher, including collection and logging of cores, placing them in wooden core boxes in a proper sequence, numbering each core etc. all as per IS Specifications for the following depths measured from existing ground level. Item includes all the handling charges and dispatching of the core’s boxes/ samples to store/ laboratory etc. all as per the IS Specification and as directed by engineer in charge. Note: Experienced geologist shall supervise the core logging and shall also describe the rock in their fresh condition with presence of discontinuity, fracture etc.

Obtaining 100 mm diameter 450 mm long undisturbed soil samples at every 3m interval up to 10 m depth or at change of strata alternate to SPT from boreholes and sealing and labelling the container. In case of UDS sample could not be extracted for a depth that shall be replaced with SPT for the respective depth as per drawing, IS specification and as directed by Engineer.

Conducting Standard Penetration Tests (SPT) in soil, soft and weathered rock at 3m intervals or at every change of strata alternate to undisturbed sampling and collecting the disturbed sample. Packaging and labelling the disturbed soil as per drawing, IS specification and as directed by Engineer.

Conducting Field Permeability Tests (FPT) in borehole at specified depth as per layer encountered during progress or as per drawing, IS specification and as directed by Engineer.

Collecting ground water samples from boreholes at specified depth including all provision of sampling, packing, sealing, and labelling as specified and including handling charges etc. all as per the IS Specification and as directed by Engineer. Water samples shall be collected in a five-litre polythene or glass container and shall be labelled, preserved, and sent to the laboratory for chemical analysis.

Conducting Field California Bearing Ratio (CBR) test as per specified depth or at a depth of 500mm below natural ground level at soaked condition all as per the specification and as directed by Engineer.

Excavating 3.0m x 3.0m x 3 to 4m deep trial pits at the locations specified by the Engineer in charge including visual inspection for description of the strata encountered and backfilling the trial pits to make the area clear after inspection and collecting soil and water samples at 0.5-1m intervals for analysis, including mobilisation of all the necessary equipments, excavation and inspection for soil classification including providing necessary shoring, side-slopes etc complete. Collecting site photographs (at least two nos. for each pit from different direction) of the strata encounter and enclosing the same with the report etc., carrying out field density test, all as per the specification and as directed by Engineer.

Conducting Eletrical Resistivity Tests (ERT) by Wenner’s four electrode method as per IS 3043. The tests at each location shall be conducted as a series of tests with the distances between the electrodes as 1.5m, 3m and 6m each on either side along each row axis etc. all as per the specification and as directed by Engineer. Note: Test shall be considered completed and shall be count as one number only if it is conducted in all 8 directions

Supply and installation of Standpipe inside the bore hole after field testing and sample collection up to desired depth. The installation is inclusive of all filter materials, screen pipes, geotextiles cover, fixed capping arrangement at top etc as per drawing or as directed by Engineer. No bentonite/ polymeric drilling fluid shall be used for stabilization of borehole walls. The temporary casing pipe shall be used up to end of borehole and withdrawn during standpipe installation after the filling of filter material as per drawing or as directed by the Engineer. The PVC-U standpipe for casing and screen shall be in accordance with IS 12818 and as per availability of diameter from manufacturer.

Conducting Down-Hole Seismic Test (DHST) including the borehole preparation, equipment (Geophones, Seismic Source, cables, connectors etc), manpower, geophysical expert, data processing, interpretation and reporting, at specified depths for the identified boreholes or as directed by Engineer in accordance with ASTM D7400.

LABORATORY TESTS Note: The numbers of laboratory test may be revised based on the actual site sampling after the completion of borehole.

Grain size analysis:

Hydrometer analysis

Sieve analysis

Liquid limit, plastic limit, plasticity index.shrinkage limit and shrinkage ratio.

Laboratory CBR test

Field density and moisture content.

Proctor Density (MDD & OMC)

Standard

Modified

Specific gravity of soil.

Free swell index measurement

Swelling pressure test

Laboratory permeability test

Unconfined compressive strength test on undisturbed soil samples or soil samples compacted to specified density.

Direct Shear test on soil samples compacted to specified density.

Tri-axial Compressive Strength test on undisturbed soil samples or soil samples compacted to specified density:

Unconsolidated undrained test.

Consolidated undrained test.

Consolidated drained test.

Consolidation test on undisturbed soil samples or on soil samples compacted to specified density, giving full test results including unit weights, specific gravity, e-log p curve, virgin curve, p0, e0, Cc, Cv and mv for all pressure increments, etc. (Tests without presentation of these results will not be paid for.)

Full chemical analysis of undisturbed soil samples or disturbed SPT soil samples including sulphates as SO3, chlorides and pH.

Full chemical analysis of ground water including colour, odour, pH value, sulphates, chlorides, carbonates, nitrates, and organic matter, etc.

Specific gravity of rock sample

Unit weight of rock sample

Water absorption & porosity of rock samples.

Point Load Index Test on core samples

Unconfined compression strength of rock core:

Without saturation

With at least 7 days saturation

PREPARATION OF REPORT

Preparation and submission of Soft Copies & Hard copies Draft & Final report of geotechnical investigations, interpretation, ground improvement and foundation recommendations for both shallow and deep foundation NOTE: The final report in soft copies in pdf / word format shall be submitted along with hard copies.

The Designers Consortium

THEODESH CONSULTANTS

CEG Test House And Research Centre Pvt. Ltd.

Visiontek Consultancy Services Pvt. Ltd.

Xplorer Consultancy Services Pvt. Ltd.

HRP Infra Pvt. Ltd.

Genstru Consultants Pvt. Ltd.

Soiltech (India) Private Limited

Geoservices Maritime Pvt Ltd

INDIAN RESOURCES INFORMATION AND MANAGEMENT TECHNOLGIES PVT LTD

S.M. Consultants Private Limited