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Method blanks are run to check whether the glassware and reagents are free of interference from chemicals that would invalidate the analyses; Standards are prepared using the applicable reference materials; 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. Photo ionization Detector (PID) : The PD is calibrated in accordance with the manufacture's recommendations prior to use in the field. Upon arrival at the project site, the PD 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 PD, subsequent readings of "0.0" registered from samples tested in the field are recorded as "0"(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). Decontamination Rinsate, Monitoring Well Purge 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 or lined, roll-on/roll-off dumpsters. The drilling equipment decontamination rinseate 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 labeled 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. Performing Head Space Analyses: Head space analysis is performed using a photo ionization detector (HD) 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 PD probe or tip of the drager tube is inserted into the container and the gas is sampled. The highest concentration of organic vapors displayed by the ND or the drager tube reading will be recorded.