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el 'l► M City of Stockton A68101.02C February 23, 1996 Page A-4 • Matrix spikes are analyzed in duplicate to validate the accuracy and precision of the method; and • 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-5 Standard Operating Procedures for Using Photoionization Detector(PIDI: 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 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 detected). When background concentrations of organic vapors register at some quantity above "0.0", subsequent readings registered from samples tested in the field at or below this value are recorded as "B/G" (background). A-6 Standard Operating Procedures for Decontamination Rinsate Monitoring Well Pure Water, and Soil Cuttings Disposal: The soil cuttings generated by drilling operations • are retained on site, and either covered by plastic sheeting or containerized in United States Department of Transportation (DOT)-approved drums. The drilling equipment decontamination rinsate is also stored in drums. Water purged from monitoring wells is containerized in drums if contamination is known or suspected. Drums containing soil, rinsate, and purged water are sealed and temporarily stored on site at a location remote to the public. Each drum is labelled to identify its contents. Disposal of these wastes will be the responsibility of the client. The client will be informed that the wastes must be disposed in accordance with applicable Federal, State, and local regulations. A-7 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 and the gas is sampled. The highest concentration of organic vapors recorded by the PID or the drager tube reading will be recorded.