Geotechnical investigations, Field / In-Situ Testing at Sirkari Bhyol Rupsiabagar (SBR) Hydro- Electric Project (120 MW), Munsiyari , District Pithoragarh

Diamond core drilling vertical hole (with 0-10 angle from vertical) of desire depth with double barrel core samplers for geological & geotechnical investigation in the project area and around the project alignment of Sirkari Bhyol Rupsiabagar HEP (as given below in desired mode) as per specification of NX size, having depth as per Direction of Engineer In Charge including all cost of material, labour, T&P etc. complete in all respect, with a core recovery as per relevant IS I.S Specifications and boxing (Making and supplying of sal wood/ local wood core boxes with dummy (core loss), wooden blocks and packing materials as per IS Specification number 4078 - 1980 with latest amendments, if any, including all cost of labour, materials, carriage and T&P complete in all respect with painting and writing, marking etc) levelling and transportation of the core etc. the above work also includes water permeability test (Double packer method) at every 3.0 to 5.00 M depth in ascending and descending order including all cost of materials, labour, T&P others equipment’s etc. complete in all respect required for performing the test including and cost of geological logging of drilled holes as per Indian standards and submission of report complete in all respect to full specification of Engineer-in-Charge. As per ToR Sl no 3 (A) & (B-1) Location :- Surge Shaft (70m), Pressure Shaft (180m)

Diamond core drilling vertical hole (with 0-10 angle from vertical) of desire depth with double barrel core samplers for geological & geotechnical investigation in the project area and around the project alignment of Sirkari Bhyol Rupsiabagar HEP (as given below in desired mode) as per specification of NX size, having depth as per Direction of Engineer In Charge including all cost of material, labour, T&P etc. complete in all respect, with a core recovery as per relevant IS I.S Specifications and boxing (Making and supplying of sal wood/ local wood core boxes with dummy (core loss), wooden blocks and packing materials as per IS Specification number 4078 - 1980 with latest amendments, if any, including all cost of labour, materials, carriage and T&P complete in all respect with painting and writing, marking etc) levelling and transportation of the core etc. the above work also includes Standard Penetration test (SPT) in Barrage area including all cost of materials, labour, T&P others equipment’s etc. complete in all respect required for performing the test including and cost of geological logging of drilled holes as per Indian standards and submission of report complete in all respect to full specification of Engineer-in-Charge. As per ToR Sl no 3 (H) Location:- On left bank of Barrage axis 35m +35m

Diamond core drilling vertical hole (with 0-10 angle from vertical) of desire depth with double barrel core samplers for geological & geotechnical investigation in the project area and around the project alignment of Sirkari Bhyol Rupsiabagar HEP (as given below in desired mode) as per specification of NX size, having depth as per Direction of Engineer In Charge including all cost of material, labour, T&P etc. complete in all respect, with a core recovery as per relevant IS I.S Specifications and boxing (Making and supplying of sal wood/ local wood core boxes with dummy (core loss), wooden blocks and packing materials as per IS Specification number 4078 - 1980 with latest amendments, if any, including all cost of labour, materials, carriage and T&P complete in all respect with painting and writing, marking etc) levelling and transportation of the core etc including all cost of materials, labour, T&P others equipment’s etc. complete in all respect required for performing the test including and cost of geological logging of drilled holes as per Indian standards and submission of report complete in all respect to full specification of Engineer-in-Charge. As per ToR Sl no 3 (G – 12 & 13) Location:- On Landslide zone on left bank of downstream of Barrage 50m +100m

Rock mechanics laboratory test on NX size(54mm) in surge shaft and pressure shaft area (11 tests) As per ToR 3 (C) a. Specific Gravity (Grain Density) b. Bulk Density (Dry & Saturated) c. Water absorption d. Void Ratio / Apparent Porosity e. Hardness f. Slake durability Index (I Cycle & II cycle) g. Brazilian Tensile Strength (Normal and Saturated Condition) h. Modulus of Elasticity and Poisson’s Ratio i. Point Load Strength Index (Diametric & Axial) j. Unconfined Compressive Strength (Normal and Saturated Condition) k. Triaxial Compressive Test (For determination of Shear strength parameters i.e. Cohesion (c) and Angle of Internal friction (ø)

In-situ shear tests near pressure shaft location a. rock-to-concrete interface b. rock-to-rock interfaces

Net Bearing capacity (plate load test) at barrage location as per ToR 3 (D)

Landslide susceptibility Mapping of landslide zone on left bank of downstream of Barrage including laboratory testing on slide martial samples & other work as per TOR 3 (G) (Point no 1 to 11) 1. Detailed study of geology, geomorphology, lithology and structural elements around landslide zone. 2. Study of change in dimension / expansion of slides (as compared to earlier study /map) and recording of manifestations such as ground cracks / fissures in adjoining areas of the landslide scar - laterally and above the crown. 3. Identification of nature of the landslide i.e. active or dormant. 4. Nature, composition and thickness of the debris material subjected to subsidence. Size of debris forming clasts/ fragments. 5. Identification of source of debris material and causative factors of the slide. 6. Study of surface/ ground water conditions i.e. seepage/ piping etc. in the material contributing/enhancing subsidence. 7. Demarcation /depth of debris versus rock contact or interface. 8. Identification of depth of level of weathering in rock and distressed rock mass if any. 9. Preparation of geological L-sections along left bank (of the river) and upslope at 40m interval up to a height of 100m above the top of the proposed barrage. (From barrage axis to d/s of main / large slide). 10. Landslide hazard, vulnerability and risk assessment. 11. Recommendation of mitigation measures and treatment.

Laboratory testing on slide martial samples (at Sl no 7) needs to be carried out to determine the engineering properties to facilitate the treatment design as per TOR 3 (G) (Point no 14) a. Specific Gravity (Grain Density) b. Bulk Density (Dry & Saturated) c. Modulus of Elasticity and Poisson’s Ratio d. Triaxial Compressive Test (For determination of Shear strength parameters i.e. C

Soil Resistivity testing at Barrage axis area as per ToR 3 (E)

Soil Resistivity testing at valve house area as per ToR 3 (E)

Soil Resistivity testing at Power house area as per ToR 3 (E)

Soil Resistivity testing at Pothead area as per ToR 3 (E)

Open pit sieve analysis and shear strength parameter in barrage area As per ToR 3 (F) • 2 or 3 nos. open pit sieve analysis shall be carried out including determination of silt factor to be used evaluate the scour depth at barrage area. • To determine the shear strength parameters, i.e., Cohesion (c) and Angle of Internal Friction (Ø), of the barrage overburden, Direct Shear Tests (Consolidated Undrained – CU) under saturated conditions are to be conducted Indian standard code IS 2720 Part-13. • Additionally, the cohesion (c) value between the overburden material and concrete (M-25) shall also be determined.

Clearing Grass and Removal of Rubbish Clearing grass and removal of rubbish up to a distance of 30m outside the periphery of the area as per Technical Specification Clause 201. (By Manual Means)

Excavation in hilly area in ordinary rock not requiring blasting by mechanical means including cutting and trimming of slopes and disposal of cut material with a lift upto 1.5 m and lead upto 20 m as per Clause 1603.2.

Random Rubble Stone Masonry laid Dry, in breast walls, retaining walls, etc. including supply of all material, labour, T&P and royalties etc. complete as per drawing and technical specifications Clauses702, 704, 1202 & 1203 of MORD Specification

Random Rubble Stone Masonry laid in1:6 cement and sand mortar, in breast walls, retaining walls, etc. including supply of all material, labour, T&P and royalties etc. complete as per drawing and technical specifications Clauses702, 704, 1202 & 1203 of MORD Specification

Construction of coolie walling including supply of all material, labour, T&P etc. cu.m required for proper completion of the work. (As per PWD Uttarakhand specifications)

Providing concrete for plain/ reinforced concrete in open foundations complete as per drawings and technical specifications Clause 802, 803, 1202 & 1203 Nominal mix 1:2:4 (Hand mixed)

ohesion (c) and Angle of Internal friction (ø))