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LA-7 Standard O en rating Procedures for Performing Head Snace Analysis: Head space <br /> analysis will be performed using a photoionization detector(PID)or a drager tube. The soil <br /> sample will be placed in a sealed glass container or plastic bag, agitated, and placed in a <br /> warm atmosphere. After approximately 15 minutes, which is generally sufficient for some <br /> of the volatiles to escape from the soil, the PID probe or tip of the drager tube will be <br /> inserted into the container and the gas will be sampled. The highest concentration of <br /> organic vapors recorded by the PID or the drager tube reading will be recorded on the <br /> boring log. <br /> L <br /> L <br /> L <br /> L - <br /> L <br /> L <br /> L <br /> L <br />