GAVESHANA GEOSCIENCES PRIVATE LIMITED

(An ISO 9001:2008 Certified Company)

WHO WE AREGaveshana Geosciences Private Limited, a company registered under the Companies Act 1956, providesconsultancy and services in various near surface investigations, geo-technical studies, exploration activities and energy.Organized and managed by a team of experienced professionals, the company provides services in the followingapplication areas:

Subsurface Utility EngineeringGround Penetrating Radar (GPR) Survey

Cable & Pipe Locator Survey

Geophysical SurveysSeismic Refraction/Reflection Survey Seismic Cross-hole/Down-hole Test

Electrical Resistivity Tomography

Gravity & Magnetic Surveys

Geodetic SurveysDetailed Survey for Transmission Line / Pipe Line

Topographic Survey for Seismic Exploration

Engineering Design

Map Making

Consultancy ServicesSeismic Survey Designs

Seismic Processing

Renewable Energy (Geothermal, Solar, Bio)

Geotechnical InvestigationsGeotechnical Investigations

Drilling & Boring

In-situ Tests

Ground Improvement Services

Laboratory TestingLab testing of Soil / Rock for determination of

Geotechnical parameters

SEISMIC REFRACTION SURVEYSeismic Refraction measurements find applications in mapping geologic, geotechnical, hydrologic, environmental, mineralexploration, petroleum exploration, and archaeological investigations. The seismic wave velocities are related to themechanical properties of earth. Hence, seismic velocity coupled with complementary geological information (boreholelogs, geological maps, outcrops data, etc) yield vital information on characterization of subsurface material, such as, typeof rock, degree of weathering, elasticity, and rippability.

Applicable Standard

The company follows ASTM StandardDesignation D5777 Guide while usingthe Seismic Refraction Method forSubsurface Investigations.

Bedrock Profile Thickness of Overburden

Identification of Fractures Identification of Weak Zones

Soil Elasticity Modulii (Young’s, Bulk, Shear, Poisson’ Ratio) Rippability Assessment in Mines

Studies of Slope Stability Studies of Pipeline Route

Mapping

Identification

Estimation

Studies

SEISMIC CROSSHOLE TESTThe Seismic Cross Hole Test yields detailed measurements of in-situ compressional and shear wave velocities in casedboreholes typically spaced 3 to 6 m apart. The Cross Hole test provides information pertinent to the seismic wavevelocities of the material in question. These velocities are used as input into site specific static / dynamic analyses, or forcomputing Shear Modulus, Young’s Modulus, and Poisson’s Ratio for material characterization, or for determination oflateral heterogeneity existing at site.

Applicable Standard

The company follows ASTM StandardDesignation D4428/D4428M Guide whileusing the Seismic Crosshole Test forSubsurface Investigations.

Bedrock Profile Thickness of Overburden

Lateral & Vertical Material Continuity Liquefaction Analysis

In-Situ Seismic (P & S) wave velocities

Studies of Deformation Studies of Amplification & Attenuation of Ground Motion

Mapping

Evaluation

Profiling

Studies

Depth

(m)Vp (m/S) Vs (m/S) Vp (m/S) Vs (m/S) PR YM (GPa) SM (GPa) BM (GPa)

0.5 1855 972

1.5 1995 1028

3.0 2193 1076

4.5 2514 1204

6.0 2607 1247

7.5 2638 1261

9.0 2821 1356

10.5 2920 1404

12.0 2941 1416

13.5 3190 1520

15.0 3235 1534

16.5 3248 1546

18.0 3293 1567

19.5 3321 1567

20.0 3307 1567

12.50 m

3266 1550 0.35 15.63

1392

TABLE - 3: FORMATION INTERFACES

Crosshole Test for 2 X 660 MW Supercritical Based Tentulei TPP at Tentulei Site, Distt. Angul, Odisha

Date of Observations: 27 July 13 Summary of Formation Interfaces & Average Values of Dynamic Properties

2014 1025 0.32 5.58 2.11 5.35

5.77 17.91

0.35 9.42 3.48 10.57

0.35 12.56 4.65 13.90

7.75 m

3.75 m

2586 1237

2894

SEISMIC UPHOLE / DOWNHOLE TESTThis test method is applied for determination of the interval velocities from arrival times and relative arrival times ofcompression (P) and vertically (SV) and horizontally (SH) polarized shear (S) seismic waves which are generated nearsurface and travel down to an array of vertically installed seismic sensors. The method provides accurate in-situ P and Swave velocities essential for use in geotechnical foundation designs. The results are used in analyses of soil behavior inboth static and dynamic loads where elastic constants are input variables into the models defining different states ofdeformations such as elastic, elasto-plastic, and failure. Another use of estimated shear wave velocities in geotechnicaldesign is in liquefaction assessment of soils.

Applicable Standard

The company follows ASTMStandard Designation ASTMD7400-08 Guide while using theSeismic Downhole Test forSubsurface Investigations.

In-Situ Seismic (P & S) wave velocities

Applicable in Earthquake Engineering Structural Design

Studies of Deformation Studies of Amplification & Attenuation of Ground Motion Liquefaction Analysis Near Surface Modeling

Profiling

Site Response Modeling

Studies & Analysis

ELECTRICAL RESISTIVITY TOMOGRAPHYDC resistivity techniques, sometimes referred to as Electrical Resistivity (ER), Electrical Resistivity Imaging (ERI) or VerticalElectric Sounding (VES), measure earth resistivity by driving a direct current (DC) signal into the ground and measuring theresulting potentials (voltages) created in the earth. From that data, electrical properties of the earth (the geo-electricsection) can be derived and thereby the geologic properties inferred.

Applicable Standard

The company follows ASTMStandard Designation ASTMD6431-99 Guide while usingthe Electrical Resistivity Methodfor Subsurface Investigations.

Depth to Bedrock Depth to Water Table Depth to Geo-electric Boundaries

Geologic Features Aggregate deposits for quarry operations

Estimation

Mapping

Study

Earth Impedance or Resistance Cathodic Protection

GEODETIC SURVEYSThe Company provides the following range of topographic survey services usingDGPS and Total Stations

Boundary Surveys: for marking precise boundary of a project on ground

Route Surveys: for proposed routes of transportation and communication, such as, transmission lines, pipelines and tunnels

Transmission Line Surveys: Detailed survey for LV, HV and EHV Transmission Lines, Route Profiling and Tower Spotting

Land Surveys: for laying off or the measurement of lengths and directions of lines forming the boundaries of land or real property.

Construction Surveys: such as, highway pre-construction, construction and post –construction surveys

Topographic Surveys: for various geological and geophysical exploration surveys such as 2D/3D Seismic surveys, Gravity surveys, etc.

Contour Surveys: for land and water bodies

GROUND PENETRATING RADAR (GPR) SURVEYNear surface investigations using Ground Penetrating Radar (GPR) is a non-destructive technique to produce a crosssection profile of subsurface without any drilling, trenching or ground disturbances. The profiles are used for detectingburied utilities, such as, pipes, cables, etc in totally non-destructive manner.

Applicable StandardThe company follows ASTMstandard designation D6432–99 andASCE 38-02 in equipment, fieldprocedures, and interpretationmethods for the assessment ofsubsurface materials while using theGround Penetrating Radar (GPR).

Depth to Water Table Depth to Bedrock Depth & Thickness of Soil Strata Location of Subsurface Cavities

Pipes (Metallic & Non-Metallic) Underground Storage Tanks Pipelines, Sewer & Boulders Electric Cables

Inspection of Masonry Inspection of Concrete Structures Archaeological Investigations

Forensic Applications

Roads and Railroad Track-Bed Highway Bridge Scour Studies

Mapping Geologic Conditions

Location of Buried Utilities

Inspection & Investigation

Studies

GEOTECHNICAL INVESTIGATIONSThe geotechnical investigation for subsurface strata is performed by drilling/boring, sampling and other in-situ tests todelineate the mechanical and physical properties of the subsurface material to understand the feasibility for layingfoundation or other construction purposes. We also provide services for various ground improvement applications (likegrouting, shotcreting, soil/rock nailing, pilling, etc.) for slide zones, man made cut slope, underground basement andfoundation soil.

Applicable Standard

IS: 4464-1985: logging for foundation investigation

IS: 2131_1981 (SPT)

IS: 4968 (Part II)-1976IS: 4968 (Part II)-1976

IS: 4968 (Part III)-1976

IS: 1888:1982 (PLT)

IS: 5529 (Part I) 2013IS: 5529 (Part II) 2016

Standard Penetration Test of Soils (SPT) DCPT (50 mm Cone without bentonite slurry) DCPT (62.5 mm cone with bentonite slurry) SCPT (2 to 3 ton and 10 ton capacity)

Tube wells Rotary type drilling (ranging from 76 – 450 mm) Soil boring (ranging from 65 mm – 600 mm) Shot hole drilling for seismic surveys Blast hole drill Logging

For determining bearing capacity of foundation

Subsurface Sounding for Soils

Rock Drilling/Soil Boring

Plate load test

Field Permeability Test

In overburden material In Bed rock using Packers

GEOTECHNICAL INVESTIGATIONS (Contd..)

Applicable Standard IS: 4434 – 1978IS: 9214 – 1979

IS: 2720 (Part 31) – 1990

IS: 11309-1985

Soil nailing; Shotcreting; Grouting; Pilling

Other In-Situ Field Test

Ground Improvement

Vane Shear Test Modulus of Subgrade reaction (k Value) Field determination of California bearing ratio Pull-out Test on Anchor bars & Rock bolts Pressure Meter Test Geological understanding of the site

Machinery for drilling/boring

Laboratory Testing

Soil Testing

Grain size analysis Natural Moisture Content Shrinkage factor Relative density index Consolidation properties Unconfined Compressive Strength (UCS) Direct Shear Test Swelling pressure of soil Triaxial test

Geotechnical Lab Apparatus

Quality Health Safety and EnvironmentWe are an ISO 9001:2008 Certified Company. Our Quality Management System (QMS) is auditedand certified by Det Norske Veritas (DNV).

We endeavor to excel through the quality of our services.

We follow the ‘safety first' rule in all work practices. We are committed to the goal of a "ZeroAccident” operation.

We strive to minimize pollution and waste generation in all our work practices.

SALIENT FEATURES OF OUR QHSE PROCEDURES

We conduct our practices as per the standard quality norms.

We continually improve upon the quality of our services through regular internal training and

technology absorption .

We strictly adhere to safety rules and usage of mandatory PPEs. We follow hazard

identification and risk mitigation practices.

We consciously make efforts to minimize pollution and waste generation at work places.

We encourage routine inter-group and intra-group QHSE communications .

CONTACT US

GAVESHANA GEOSCIENCES PRIVATE LIMITED

Head Office:

132, First Floor, U S Complex, Opp: Apollo Hospital,

120, Mathura Road, New Delhi – 110 076 (India)

Ph: +91 11 2639 7059 / 7061, Cell: +91 99710 03022, 97172 39993

Email: enquiry@gaveshanageo.com; gaveshanageo@gmail.com

Branch Office:

944, Indira Nagar, Dehradun – 248 006 (Uttarakhand), India

Ph: +91 135 2762863, Cell: +91 94120 75734

Visit us atwww.gaveshanageo.com