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LI � City of Stockton A68107.09A May 29, 1996 Page A-3 • During groundwater sampling, a travel blank sample consisting of organic-free water is prepared and containerized in the laboratory, transported to the site, and handled and transported in the same manner as the groundwater samples. A-S Standard Operating Procedures for Using Photoionization Detector{PIDZ: The PID is calibrated in accordance with the manufacture's recommendations prior to use in the field. Upon arrival at the project site, the PID is used to monitor background concentrations of organic vapors in the atmosphere at the site. The background concentrations are measured in a location upwind and removed as possible from sources of organic vaporson the site. t When background concentrations of organic vapors register as "0.0" on the PID, subsequent readings of "0.0" registered from samples tested in the field are recorded as "ND" (not detected). When background concentrations of organic vapors register at some quantity above "0A", subsequent readings registered from samples tested in the field at or below this value are recorded as T/G" (background). t A-6 Standard Operating_Procedures for.Performing Head Space Analysis: Head space analysis is performed using a photoionization detector (PID) or a drager tube. A soil sample is placed in a sealed glass container or plastic bag, agitated, and placed in a warm atmosphere. After approximately 15 minutes, which is generally sufficient for some of the volatiles to escape from the soil, the PID probe or tip of the drager tube is inserted into the container or the bag and air above the sample is pumped into the PID or drager tube. The highest concentration of organic vapors recorded by the PID or the drager tube reading will } be recorded. 1.� �4 i C ti U U L.i