TANDCOVE undertakes unique Geological Analysis for sub surface conditions by the use of the latest generation Electrical Resistivity Imaging (ERI).

ERI measures sub surface structures and conditions from electrical resistant measurements made at the surface. These measurements are made across the site and validated by small-bore hole review evaluations. Some sites may require Test Pit review but imaging is the preferred review method.

Applications

• Landfill investigations
• Ground water investigations including depth to water table and aquifers
• Delineation of freshwater / saltwater interface
• Mapping and monitoring of soil salinity and inorganic contaminant plumes
• Location of paleochannels, faults / fractured zones
• Locating voids and mineshafts / cave systems
• Stratigraphic mapping including gravel and clay lenses
• Soil corrosion assessment

General Scope of Work

Tandcove will carry out or procure a geotechnical study at the proposed project site. The study will be used to determine the recommended type of foundations for PV module mounting structures, buildings and roads to receive accurate and binding EPC quotations. All results will be based on the output and reference system of the topographic survey.

Desktop Feasibility Study:
Tandcove will undertake a desktop geotechnical feasibility study based on a site visit and topographic and hydrological studies considering:

1. Site geomorphological survey to determine the nature and engineering properties of the soils/rocks underlying the site;
2. Geological and hydrogeological mapping;
3. Constraints definition; and
4. Seismic risk.

Onsite Investigations:
Tandcove will conduct or procure an onsite investigation of the surface and sub-surface geology and geotechnical conditions to determine properties such as excavability, ground bearing capacity, compatibility, gradability etc. consisting of at least:

1. Soil resistivity - ERI;
2. Test Bore Hole review
3. Limited test pits to determine refusal depths down to at least 4m below ground level;
4. Photographs of test pits;
5. Presence of groundwater in test pits, sidewall collapse;
6. Soil sampling testing and profiling (density, chemistry, sulphate content, cohesion, moisture content, conductivity, pH value, elastic/plastic modulus, direct shear strength, friction angle, grading, corrosivity, sieve analysis, Atterberg Limit and other engineering properties to international standards);
7. Penetrometer tests at the proposed locations of substation and transformer buildings; and
8. Representative number of pull-out and lateral testing of piled structures (see Foundation Study).

NATA Laboratory Testing
Deliverables
Tandcove will produce:
1. A feasibility report detailing:

a. The methodology, results and conclusions/recommendations of the desktop assessment;
b. Uncertainties in available information in determining the geotechnical conditions; c. Construction principals to be adopted;

2. Site investigation report detailing:

a. The methodology, results and conclusions/recommendations of the onsite tests;
b. Risks associated with construction;

3. A map referenced to the topographical survey developed in Subtask 2(a) indicating:

a. Locations of test sites inc. ERI;
b. Type of geology encountered;
c. Refusal depths encountered;
d. Soil pH;
e. Recommended foundation types; and
a. Soil parameters required for L Pile software.