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A <br /> City o.f Stockton A68104 OIA <br /> October 25, 1995 Page A-7 <br /> A-10 Standard Operating Procedures for Performing Head_Space Analysis Head space <br /> analysis is performed using a photoiomzation detector (PID) or a drager tube A soil <br /> sample is placed in a sealed glass container or plastic bag, agitated, and placed in a warm <br /> atmosphere After approximately 15 minutes, which is generally sufficient for some of the <br /> volatiles to escape from the soil, the PID probe or tip of the drager tube is inserted into the <br /> container and the gas is sampled. The highest concentration of organic vapors recorded by <br /> the PID or the drager tube reading will be recorded <br /> i <br /> M <br />