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We are hiring a malagasy Design Office for all or part of the following fields. The scope of work for each field is detailed down here :
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– Perform a detailed and comprehensive geotechnical investigation at the site to provide subsurface information and to evaluate the bearing materials that will ultimately support the foundations for the proposed PV power plant.
– Take a borehole for each hectare, total Boreholes = 27 Boreholes.
– Recommend soil design criteria, appropriate foundation types, and allowable bearing capacities.
* Structures on the site will include PV panels supporting structures, Inverter stations, transformers and transformers compact stations, Combiner boxes, electrical rooms; firefighting building; administration building; warehouse; water and wastewater treatment plants; and treated water storage tank(s).
The PV mounting structures might be fixed to the ground using driven piles ramming and/or screw piles.
The design office shall complete the following scope of geotechnical services:
- Review geotechnical maps of the area (if available), including roads and canals, as well as published maps and aerial photographs.
- Conduct a site and area reconnaissance for evidence of geotechnical concerns.
- Conduct all field work in accordance with the aforementioned standards.
- Cone Penetration Test
- Cross hole Seismic Test
- Field logging
- Site characterization
- Soil Classification
- Soil Resistivity
- Standard Penetration Test and Split Barrel Sampling
- Thin-Walled Tube Sampling
- Soil Thermal Resistivity
- Soil Electrical Conductivity
- Make the necessary soil test borings to evaluate general subsurface conditions and consistency in the site. If the results are not consistent, extra boreholes to be done for the site. Soil test borings will extend to 10 meters below the existing surface or to auger refusal, whichever occurs first.
- Identify the location of each boring (E- and N-coordinates) to the nearest 0.3 meters. Prepare a log of each boring.
- Record water levels in the borings at the time of drilling.
- Take at least three (3) undisturbed samples per boring and at least three (3) disturbed samples per boring, to provide the laboratory testing required information.
- Perform standard penetration tests (SPTs) at approximately 1.5-meter intervals to assess the composition and consistency of the soil; collect disturbed samples.
- Backfill and patch borings as needed.
- Install two piezometers to measure shallow and deep groundwater levels (if groundwater exists)
- Analyze samples in accordance with the aforementioned standards.
- Atterberg Limits.
- Direct Shear
- Expansion Index
- Free swell
- Hydraulic Conductivity
- Modified Proctor
- Standard Proctor
- Triaxial Compression
- Unconfined Compressive Strength
- Moisture Content
- Sieve Analysis
- Collapse Potential of Soil
- Measuring pH of Soil
- Test for Chlorides, Sulfates, Sulfides
- California Bearing Ratio (CBR)- Soaked and un-soaked
- Site contamination study to be performed. 4 samples shall be made combined to make one combined sample for each sample
- Chemical analysis test for soil shall be performed to find out nature of corrosiveness of soil as per the aforementioned standards in addition to the following codes:
- ASTM D4972 – 13: Standard Test Method for pH of Soils
- ASTM-D4327- 11: Standard Test Method for Anions in Water by
- Suppressed Ion Chromatography
- Recommendations for the above tests also to be furnished.
- Upon completion of the field effort, submit a written report that documents findings along with conclusions and recommendations. The report shall be prepared under the supervision of a licensed professional engineer specializing in geotechnical engineering. The report shall include the following:
- A brief review of field procedures, including a site map showing boring locations. A review of area and site geological conditions.
- A review of subsurface soil and rock stratigraphy, including a thorough discussion of physical properties and illustration(s) of typical subsurface soil profiles.
- A discussion of site preparation issues, including any potential excavation difficulty due to rock or groundwater.
- Recommendations for site preparation.
- Recommendations for foundation design and construction.
- Recommendation on the type of Cement or Concrete and reinforcing bars per CIRIASP31 and C577.
- A thorough review of potential design and/or construction issues indicated by the exploration.
- All field and laboratory data in appropriate appendices.
- It is to be noted that, as the PV panels are light weight structures and wind load will govern the design of the foundation, the recommendation in the report shall cover the uplift nature of the possible types of PV foundations like anchor foundations, mini pile foundations and strip foundations.
- Recommendations for the drainage characteristics of the sites (isolated & combined) Seismic characteristics of the site area and horizontal seismic acceleration value for the sites.
- Recommendation for Erosion of site soil if applicable.