GT investigation and material survey for the DPR for const of a 4-lane major bridge over River Bhagirathi, including viaducts, ROBs, etc, connecting Kalna of STKK Road and Gobindapur of NH 12 in the district of Purba Bardhaman and Nadia in WB

Amount

PART A: Geotechnical Investigation for Main Bridge over Bhagirathi River

Preparatory Works, mobilisation & demobilisation, carriage etc. Mobilisation, hire (including operation and maintenance) and demobilisation charges of all tools & plants along with accessories, material, labour, personnel, supervision etc. at site of work required in connection with boring and testing works, including setting up boring rigs and shifting to different Bore-hole points and also including withdrawal of same from the site after completion of work and complete as per direction of Engineer-in-Charge for detailed geotechnical and geophysical Investigation for requisite numbers as per detailed tender conditions and specifications. The rate shall be complete in all respect for mobilisation & demobilisation of all to complete the works as per the tender conditions and technical specifications. Note 1: Payment will be made after successful completion of work. Note 2: Charge is considered for total number of sets to be mobilised as per the tender conditions (List of Equipment). Note 3: The item description shall also be valid for the works under Part B and C and the rate quoted under this item shall include the relevant mobilisation, demobilisation etc. for Part B and C also.

Construction of Temporary Island (inside the water body) by construction of outer annular layer with sufficient rows of Steel channels/H piles/Sheet pile of U or Z type, suitably spaced, of suitable dimensions, driven suitably, properly tied, braced and supported and filling the annular space with sand / soil filled bagsor as the case may be, protected by drum sheet walling on both side and filling the core portion with locally available materials including the dismantling, removing and cleaning the site of the construction of main component of the structure. Note: The agency can also work with other means instead of making temporary island within the same rate quoted by them. In such cases, provision, mobilization, operation, and demobilization of floating working platform (e.g., interconnected drum pontoons or floating barge/fixed working platfor/jack up barges/or as the case may be) for stable execution (of specify activity, e.g., SPT boreholes and/or CPTu drilling, PMT and other tests as per the detailed tender conditions and specifications to complete entire scope of works or as the case may be) within the water body, including all necessary anchoring, positioning, towing and safety arrangements.

Carriage of all Disturbed & Undisturbed Samples from site of work to the Divisional office or elsewhere including loading and unloading for detailed geotechnical and geophysical Investigation. Note 1: Some samples may be required to be kept at Sub-Division Office for Additional testing by the Engineer-in-Charge. Note 2: Payment shall be made for actual number of carriages and to be certified by the supervisor of the client. Note 3: The rate shall include any type of samples which are to be carried from site to laboratory for testing including disturbed and undisturbed samples

Drilling and other drilling related works

Drilling for making Bore-Holes of 150mm by any standard method to any depth below ground level / bed level in all kinds of soil like clay, silt, sand, stiff clay, mixed soils etc. except rocks (for the purpose of collecting Disturbed & Un disturbed soil samples, conducting Standard Penetration Test at suitable intervals etc.) including preparation and submission of bore-log as per IRC : 75 and 78 and Clause 2400 of Specifications for Road & Bridge Works (5th Revision), Published by IRC, and also including hire charges of tools and plants complete as per the direction of Engineer-in-Charge. a) When Casing pipe is used to prevent collapse of bore hole (casing pipe to be finally withdrawn). Note 1: These are Rotary Cored Boreholes requiring Hydraulically operated Rigs. Note 2: Borehole diameter may be telescopically reduced with depth, as per requirement without compromising with the quality of works and as approved by the Engineer-in-Charge. Note 3: Atleast 3 boreholes (2 onshore and 1 offshore) shall have to beprepared for carrying out down-the-hole suspension logging test and the rate shall be quoted accordingly as no additional cost shall be borne by the client. Note 4: A total of 6 boreholes are expected to be drilled out of which, 4 boreholes shall be onshore/nearshore and 2 boreholes shall be offshore)

Depth 0m to 10m

Depth greater than 10 m and upto 20 m

Depth greater than 20 m and upto 30 m

Depth greater than 30 m and upto 40 m

Depth greater than 40 m and upto 50 m

Depth greater than 50 m and upto 60 m

Depth greater than 60 m and upto 70 m

Depth greater than 70 m and upto 80 m

Depth greater than 80 m and upto 90 m

Drilling of NX dia boreholes up to 90 m depth for pressuremeter test: Drilling for making Bore-Holes of NX size by any standard method to any depth below ground level / bed level in all kinds of soil like clay, silt, sand, stiff clay, mixed soils etc. except rocks including all kinds of tools & tackles, material, equipment complete in all respec but excluding cost of the test. Note 1: A total of 3 boreholes are expected to be drilled out of which, 2 boreholes shall be onshore/nearshore and 1 borehole shall be offshore). Note 2: The rate quoted by the bidder shall be applicable for both offshore and onshore works.

Preparation of Boreholes for resumption of CPTu till it reaches desired depth of 90m: Drill out of the CPTu refusal layer for the purpose of resumption of the CPTu test including double casing (if required) to successfully complete the CPTu test upto the desired depth of 90m. Note 1: A total of 6 Tests are expected to be done upto depth of 90m each out of which, 4 tests shall be onshore/nearshore and 2 tests shall be offshore). Note 2: The rate quoted by the bidder shall be applicable for both offshore and onshore works.

Collection of Disturbed soil sample from the bore hole for any depth between 0 to 90.0m.

Collecting undisturbed samples using Mazier Sampler (Using Swivel type Triple tube core barrel with PVC liner or as per the technical specification of the contract) at specified interval from any depth between 0 to 90m.

Collection of Undisturbed soil sample from the bore hole (Without using Mazier Sampler)

Standard Penetration Tests (S.P.T.) by Split Spoon Sampler using auto trip mechanism in the bore hole as per IS 2131.

Conducting in-situ test

Carrying out SPT Energy Measurement using SPT energy analyzer at store and submission of energy transfer ratio (ETR) certificate. Note: While quoting for relevant item of mobilisation, demobilisation etc., the biider shall include the cost of mobilisation, demobilisation etc. of SPT energy measurement test equipment also.

Carrying out borehole deviation survey as per ASTM D4432 recommendations

Carrying out Cone Penetration Test (CPTu) test using cone/probe for the determination soil characteristics. The test shall ensure minimum three outputs such as i) sleeve resistance ii) tip resistance, iii) pore water pressure and other parameters as directed by EIC. Note: It is clarified that the CPTu tests shall have to be conducted upto a depth of 90m. It is quite usual to push CPTu rig upto certain depth (approx. 50-60m) till it meets first refusal (meaning, the probe cannot be pushed down further due to meeting any one of the refusal criteria given in the specification). However, if refusal is met, the CPTu probe shall be withdrawn, the bore hole shall have to be drilled out till suitable soil is found through which the probe can be further pushed into the soil (suitability of the soil shall be determined based on the already conducted SPT boreholes and collected soil samples). This should be continued till the depth of 90m. The cost of such drilling (pre-drilling for restart of the CPTu) shall be paid as per item mentioned elsewhere in this document. Note 1: Instead of CPTu, the agency can also conduct the SCPTu but with no extra payment. Rate quoted against this item shall remain firm for both CPTu and SCPTu.

Conducting Down the Hole Suspension Logging/P-S logging along with data interpretaion and report. Note 1: Minimum 2 nos. shall be done onshore/nearshore and 1 no. shall be done offshore to get an idea across the entire width of the river bed material. Note 2: Each of the tests shall be carried out for a depth of 90m in those boreholes in which SPT has already been conducted and borehole has been prepared for carrying out Down-the-hole suspension logging. Note 3: Instead of Down-the-hole suspension logging/P-S logging, the agency can also conduct Cross Hole Seismic Test with 1:2 borehole configuration (1 transmitter and two receivers). However, NO additional cost towards drilling of additional boreholes, preparation of boreholes for CHST including liner, pipes, grouting etc. shall be borne by the owner/client.

Carrying out Menard Pressure Meter Test (PMT) in separate Boreholes dedicated for PMT including all and complete in all respect. Note: Cost of boreholes shall be paid separately under relevant item of boring. Frequency of the Test shall be 1 no. for each 5m or as directed by the Engineer-in-Charge.

Laboratory tests (Carrying out following laboratory tests (Index Tests)

Determination of Water Content as per IS 2720 (Part – II).

Determination of Water Content Dry Density relation using light compaction as per IS 2720 (Part – VII).

Determination of Water Content Dry Density relation using heavy compaction as per IS 2720 (Part – VIII).

Determination of Density Index (Relative Density of cohesion less soil) as per IS 2720 (Part – XIV).

Determination of Specific Gravity as per IS 2720 (Part – III).

Grain size analysis by Hydrometer Method as per IS 2720 (Part – IV).

Grain size analysis by Sieving as per IS 2720 (Part – IV).

Shrikage Limit

Liquid Limit

Plastic Limit

Maximum and Minimum void ratio

Strength and Compressibility Test

Direct Shear Test on Cohesive and Coarse Grained Material

Determination of Unconfined Compression Strength as per IS 2720 (Part – X) (Undisturbed)

Determination of Unconfined Compression Strength as per IS 2720 (Part – X) (Remoulded)

Triaxial Test

Consolidated Isotropically Drained (CID) Triaxial Test on Coarse Grained Material

Consolidated Anisotropically Undrained (CAU) Triaxial Test on Cohesive Material

Consolidation Test/Oedometer Test

Determination of Shear strength Parameters of a specimen tested in Unconsolidated Undrained Tri-axial compression without measurement of pore water pressure as per IS 2720 (Part – XI).

Chemical Analysis

Determination of pH Value of water as per IS 2720(Part– VIII).

Test for Sulphate & Chloride in Water

Determination of pH Value of soil sample

Test for Sulphate & Chloride of soil sample

Determination of Organic Matter as per IS 2720 (Part– XXII)

Mica Content

Conducting Dissipation test in the CPTu borehole at specified depth in cohesive soil Mximum time 3 hours or 50% dissipation of excess pore pressure whichever is earlier

Others

Preperation and Submission of Geotechnical Factual Report and Interpretative Report (3 Hard Copies) including supply of the Raw and finished data in CD/Pendrive. Report is required to be submitted in phases as per the work sequence and specified in the tender documents.

PART B: Geotechnical Investigation for viaduct, ROB, VUPs & other bridges

Drilling bore-Holes of 150mm by any standard method to any depth below ground level / bed level in all kinds of soil like clay, silt, sand, stiff clay, mixed soils etc. except rocks (for the purpose of collecting Disturbed & Un disturbed soil samples, conducting Standard Penetration Test at suitable intervals etc.) including preparation and submission of bore-log as per IRC : 75 and 78 and Clause 2400 of Specifications for Road & Bridge Works (5th Revision), Published by IRC, and also including hire charges of tools and plants complete as per the direction of Engineer-in-Charge. a) When Casing pipe is used to prevent collapse of bore hole (casing pipe to be finally withdrawn)

Depth 0m to 10m

Depth greater than 10 m and upto 20 m

Depth greater than 20 m and upto 30 m

Depth greater than 30 m and upto 40 m

Depth greater than 40 m and upto 50 m

Extra for boring in water (1.2m and higher depths).

Field Investigation v) Collection of Undisturbed soil sample from the bore hole to be made by the concerned Division / Party at their cost. (a) Undisturbed

iii) 20.0m-30.m

iii) Collection of Samples from the bore hole made (b) Disturbed

Standard Penetration Tests (S.P.T.) by Split Spoon Sampler using auto trip mechanism in the bore hole as per IS 2131.

iii) 20.0m-30.m

Laboratory Investigation:

Liquid Limit as per IS 2720 (Part – V).

Plastic Limit as per IS 2720 (Part – V)

Grain size analysis by Sieving as per IS 2720 (Part – IV).

Grain size analysis by Hydrometer Method as per IS 2720 (Part – IV).

Determination of Water Content as per IS 2720 (Part – II).

Determination of Specific Gravity as per IS 2720 (Part – III).

Direct Shear Test as per IS 2720 (Part – XIII).

Determination of Unconfined Compression Strength as per IS 2720 (Part – X) a) Undisturbed

Tri-Axial Shear Test.

Determination of Shear strength Parameters of a specimen tested in Unconsolidated Undrained Tri-axial compression without measurement of pore water pressure as per IS 2720 (Part – XI).

Laboratory Determination of Permeability as per IS 2720 (Part– XVII).

Determination of Consolidation Properties as per IS 2720 (Part-15)

Water Sample Test (Chemical analysis)

Determination of pH Value as per IS 2720(Part– VIII).

Test for Sulphate & Chloride in Water

Soil Sample Test (Chemical analysis)

i) Determination of pH Value as per IS 2720(Part– VIII).

ii) Test for Sulphate & Chloride

Preparation and submission of report in 6 (Six) copies, giving all relevant information data like site plan, Bore log and water table, test results, calculations, discussions, suggestions and recommendations in respect of suitable foundation etc. including including determination of silt factor calculation of waterways and complete design of foundation including analysis of Bearing Capacities and settlements in bound and presentable form complete as per direction of Engineer-in-Charge. b) Detailed Investigation

PART C: Material Survey

Pavement/Borrow Area Investigation

Conducting sub-grade/ Existing ground / Borrow area by excavation of Test Pit of size 1m x 1m up to the depth of sub-grade/ 1.0m or groundwater level or refusal to manual excavation, whichever is shallower. at the interface of pavement and shoulder or at proposed center line for determination of pavement composition/ soil strength including determination of field density and field moisture content at sub-grade Level/ ground level

Laboratory Investigation:

Water Content as per IS 2720 (Part-II)

Liquid Limit as per IS 2720 (Part – V).

Plastic Limit as per IS 2720 (Part – V)

Grain size analysis by Sieving as per IS 2720 (Part – IV).

Grain size analysis by Hydrometer Method as per IS 2720 (Part – IV).

Free Swell Index of soil as per is 2720 (Part-VIII)

Determination of Water Content Dry Density relation using heavy compaction as per IS 2720 (Part – VIII). (Modified Proctor Test)

Four days soaked CBR test at 97% of MDD as per IS: 2720, Part XVIII

Field Investigation:

Determination of Density of soil in place by Sand-replacement Method as per IS 2720 (Part – XXIII).

Field determination of California Bearing Ratio as per IS 2720 (Part XXXI)

Dynamic Cone-Penetration Test using 50mm cone without using Bentonite slurry as per IS 4968 (Part – I)

IDAX CONSULTING AND RESEARCH PVT. LTD. (BID ID -882224)

Constell Consultants Pvt. Ltd. (BID ID -884140)

Geo Designs and Research Pvt Ltd (BID ID -880924)

Pioneer Surveyors (BID ID -884904)

Cengrs Geotechnica Pvt. Ltd. (BID ID -875680)