The below may be useful.
1.0 SCOPE
The objective of the geotechnical and geophysical study is to determine the surface foundation condition of the project. The investigation shall include surveying, developing a description of the geologic field conditions, boring and test holes for surface lithology proposed sites, recording drilling rates for soil and bedrock, obtaining sample materials for soil and bedrock, conducting engineering geophysical surveys, and developing design parameters for dynamic machine foundation analysis. It will also study surface material rippability and retaining ponds, laboratory testing, and engineering evaluation of conditions encountered, recommendations, and issuance of a report. The report shall include all field data, laboratory test results, and the resulting interpretations and recommendations. All testing, interpretation of results, and recommendations shall be completed under the direct supervision of a practicing Professional Engineer.
1.1 References
Latest applicable ASTM, IEEE, and UBC references shall apply.
2.0 DRILLING AND SAMPLING
2.1 General
2.1.1 Before the drilling program begins, the Contractor must discuss the program with the Company.
2.1.2 The work shall be performed using equipment of a suitable type and in good operating condition. The equipment shall be capable of boring, sampling, and testing below the water level and preventing sidewall collapse.
2.1.3 Equipment materials shall be supplied by the contractor.
2.2 Probe Holes:
- The probe hole locations shall be provided by the Company. In consultation with the Company, the Contractor may recommend the need to add or delete specific probe holes to ensure that all required information is obtained.
- The depth of probe holes shall be agreed upon between the Contractor and the Company.
- A brief soil description and locations of any change in strata shall be recorded.
- Groundwater levels in probe holes shall be recorded after the water level has stabilized. Open stand pipes and pneumatic piezometers shall be installed in the probe holes at locations to be selected by the Contractor. The location(s) and numbers of these instruments shall be agreed upon between the Contractor and the Company.
- Piezometers shall be monitored soon after installation and then after a period of 14 days. Proper protective measures such as a cap and locking device shall be installed on these piezometers.
2.3 Bore Holes:
- The bore hole locations shall be provided by the Company. In consultation with the Company, the Contractor may recommend the need to add or delete specific bore holes to ensure that all required information is obtained.
- The depth of the bore holes shall ensure that the depth of competent material has been determined and all the required information has been obtained. If bedrock is encountered, drilling shall be carried out at least 10 ft into the bedrock and cores shall be obtained for laboratory tests. If bedrock is not encountered within reasonable depths and the Contractor, in agreement with the Company, decides not to drill into bedrock, then drilling shall be out at least 10 ft into the competent material beyond the recommended pile length.
- Depth(s) of bore holes to be drilled shall be finalized in agreement with the Company.
- Undisturbed samples shall be taken for cohesive soils at any change in strata, and at 5 ft intervals within a given stratum. In areas where soil properties change rapidly with depth, samples shall be taken at smaller intervals.
- Standard Penetration Tests should be conducted at bore hole locations close to the levels where undisturbed samples are taken. Standard Penetration values must be provided for cohesionless soils.
- Groundwater levels in bore holes shall be recorded after the water level has stabilized. Open stand pipes and pneumatic piezometers shall be installed in the bore holes at locations to be selected by the Contractor. The location(s) and numbers of these instruments shall be agreed upon between the Contractor and the Company.
- Piezometers shall be monitored soon after installation and then after a period of 14 days. Proper protective measures such as a cap and locking device shall be installed on these piezometers.
- Soil pH shall be measured in accordance with ASTM-G 51 - 95 completed at locations selected by the Contractor.
2.4 Soil Resistivity Testing:
- Soil resistivity testing locations shall be provided by the Company.
- Soils electrical resistivity measurements shall be taken per IEEE Std 81-1983 (Wenner Four-Electrode Method) to a depth of 15 ft. Test results are to be submitted in the written report. The report shall include ohmmeter values obtained and location of test points.
2.5 Dynamic Soil Property Testing:
- The Contractor shall discuss all aspects of the testing to evaluate dynamic soil/bedrock properties with the Company prior to proceeding.
- Dynamic soil/bedrock property testing locations shall be provided by the Company.
- Crosshole Seismic Testing shall be carried out to evaluate dynamic soil properties per ASTM-D4428 - 00 using the "three-hole" test method.
- The contractor shall provide justification to show the reliability of alternate testing if proposed. Alternate testing shall be approved by the Company.
3.0 LABORATORY TESTING
3.1.1 Sufficient tests shall be performed to permit the development of geotechnical design for earthwork and site development, including roads and foundation design criteria. The number and location of these tests shall be finalized after a review of field logs by the Company and Contractor. Tests on representative samples may include, but not necessarily be limited to, the following:
- Cohesive Soils
- Natural moisture content
- In-situ density
- Grain size analysis
- Atterberg limits
- Consolidation tests including rebound
- Shear strength tests (unconfined compression tests)
- Compaction tests
- Swell tests
- Cohesionless Soils
- Specific gravity
- Grain size analysis
- Friction angle
- Miscellaneous
- Water soluble sulphate content
- pH
- Soil resistivity
- CBR (both soaked and unsoaked)
- Other tests as required for recommendations
- Spare soil samples shall be retained for possible additional testing in the future. These samples shall be properly stored for a minimum of 6 months. The Company shall be notified before these samples are discarded.
- Test data points shall be shown on all plots, charts, or graphs of the report.
Regards.