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(2) P For identification and classification of the ground, at least one borehole or trial pit with sampling shall be available. Samples shall be obtained from every separate ground layer influencing the behaviour of the structure.
(3) Sampling may be replaced by field tests if there is enough local experience to correlate the field tests with the ground conditions to ensure unambiguous interpretation of the results.
(7) Samples should be taken at any change of stratum and at a specified spacing, usually not larger than 3 m. In inhomogeneous soil, or if a detailed definition of the ground conditions is required, continuous sampling by drilling should be carried out or samples recovered at very short intervals.
(1) P A number of checks and additional tests shall be made during the construction and execution of the project, when relevant, in order to check that the ground conditions agree with those determined in the design investigations and that the properties of the delivered construction materials and the construction works correspond to those presumed or specified.
(2) P The following control measures shall be applied:
−check of ground profile when excavating;
−inspection of the bottom of the excavation.