 Geotechnical specialists are used in the investigation and interpretation of results.Section 3 Field investigation Pages 24–45

This section is more specific with regard to how the ground is investigated using methods such as excavating or drilling.Frequency of sampling and testing can be decided with the following in mind, the determination of the character and structure of all the strata and ground water conditions, the determination of the properties of the strata and the use of special techniques should ‘normal’ techniques not give satisfactory results.