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F2 City of Stockton A68106.01A May 29, 1996 Page A-3 1 • Matrix spikes are analyzed in duplicate to validate the accuracy and precision of the method; and F, • During groundwater sampling, a trav l blank sample consisting of organic-free water is prepared and containerized in the laboratory, transported to the site, and handled and transported in the some manner as the groundwater samples. A-5 Standard Operatinp,Procedures for Usin2 P riotoignization Detector PID : The PID is calibrated in accordance with the manufacture's r commendations prior to use in the field. v' Upon arrival at the project site, the PID is used to monitor background concentrations of organic vapors in the atmosphere at the site. The t ackground concentrations are measured in a location upwind and removed as possible fro sources of organic vapors on the site. 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 r detected). When background concentrations of organic vapors register at some quantity above "0.0", subsequent readings registered from sa ples tested in the field at or below this value are recorded as "B/G" (background). A-6 Standard Operating Procedures for Performing Head Space Analysis. Head space analysis is performed using a photoionization de ector (PID) or a drager tube. A soil sample is placed in a sealed glass container or pla itic bag, agitated, and placed in a warm '-` atmosphere. After approximately 15 minutes, whi h 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 bag and air above the sample is puniped into the PID or drager tube. The highest concentration of organic vapors recorded by the PID or the drager tube reading will Fbe recorded. F F w G. 1 �C F! I '