ARCHIVED REPORTS_TEMPORARY SOIL GAS PROBE PERMIT APPLICATION PACKAGE

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SOP TO-14A/15 Rev 4 December 2007 ' to enter the exclusion zone (nor any other areas designated as exclusive by the field safety officer) at any time. Sample handling will be carried out beneath the "hood" when possible. Smoking is not permitted in the van or lab and eating is not permitted in the analysis area. Fire extinguishers, first aid kits and Material ' Safety Data Sheets are located in each van or lab. The laboratory equipment may include high-pressure hydrogen which is a fire and explosion hazard. ' 4.0 Cautions The analyst is cautioned that the equipment uses high-pressure gases and cryogenics which, while not ' flammable nor explosive, are suffocating in large quantities. The analyst must use caution when changing cryogenic tanks since a leak could allow liquid nitrogen and/or carbon dioxide to contact the skin, which could result in permanent and painful skin damage. The analyst should be aware of any potential source of ' leaking gas and should inspect all plumbing from cylinders to the instruments on a daily basis. 5.0 Interferences ' When analyzing for volatile organics, samples can be contaminated by diffusion of volatile organics through the sample container septum during shipment or storage. A trip blank prepared from zero air or helium and ' carried through sampling and subsequent storage and handling can serve as a check on such contamination. Contamination carryover can occur whenever high-concentration and low-concentration samples are ' analyzed in sequence. To reduce the potential carryover, the sample syringe or other collection device is rinsed out between samples with zero air, nitrogen or ambient air that has been checked and found to contain sufficiently low amounts of the target compounds. Whenever an unusually concentrated sample is ' encountered, it should be followed by analysis of a blank to check for cross contamination. In the Entech 7100/7300 sampler a sample position may become contaminated from a high level sample. A ' good practice for the analyst is to purge all sampling positions to be used in that day's sequence prior to analysis. This is performed by placing the fitting for zero air or helium onto the position to be purged. The Entech sequence table is then used to select that position. A sample volume of 20-50 mis can be selected. No calibration standard volume is selected. Click on the "Flush" icon on the sequence table and select"Go". The Entech will flush and pressurize this position three times. Repeat this step for all positions. After flushing system it is recommended that the system is baked for 10 minutes before proceeding with analysis. ' 6.0 Personnel Qualifications This method is to be performed by a trained analyst in gas chromatographic/mass spectrometric methods. A bachelor's degree in science or equivalent training is the minimum requirement for performance of this method. In addition, a mobile lab analyst performing this method without on-site supervision must have a minimum of 3 months of GUMS experience with this method or equivalent. ' 7.0 Instruments and Materials The following subsections discuss the instrumentation and materials needed for this method. ' 7.1 Instruments ' Page 4 of 24 1