A minimum of three-man crew consisting of a driller, driller’s helper, and a logger shall perform the sampling and logging on the field. To ensure consistency, the same crew shall complete the drilling, sampling, and logging on a project. Photo log of all samples shall be provided to the client along with the field logs for verification of consistency of the logging.

Each crew shall maintain a copy of the TxDOT Geotechnical Manual and relevant Test Methods (TxDOT, AASHTO, or ASTM) required for drilling, sampling, and classification of soil and bedrock materials.