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Standard Operating Procedures for Performing Head Space Analysis: Head space analysis is <br /> performed using a photoionization detector (PID) or a drager tube. A soil sample is placed in a <br /> sealed glass container or plastic bag, agitated, and placed in a warm atmosphere. After <br /> approximately 15 minutes,which is generally sufficient for some of the volatiles to escape from the <br /> soil,the PID probe or tip of the drager tube is inserted into the container and the gas is sampled. The <br /> highest concentration of organic vapors recorded by the PID or the drager tube reading will be <br /> recorded. <br /> Standard Operating Procedures for Equipment Decontamination: Proper decontamination <br /> procedures reduce the potential for cross-contamination among sample locations and introduction <br /> of contamination from outside sources. <br /> Before, during, and following drilling operations, drilling equipment is thoroughly cleaned using a <br /> high pressure hot water(steam)washer. Well casing, screen,end caps,and centralizers will also be <br /> cleaned using a steam washer. <br /> Steam cleaning condensate will be containerized for later disposal. Generally, disposal will be the <br /> client's responsibility. <br /> Sampling equipment and any tools,measuring devices, or other equipment which will contact soil, <br /> groundwater, or any media being assessed will be washed in a low-phosphate soap and water <br /> solution,and rinsed in clean water before each use. The type of soap used will depend upon project <br /> requirements. <br />