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y <br /> ADVISORY—ACTIVE SOIL GAS INVESTIGATIONS <br /> corresponding flow rates on field data sheets for each sample. If the pump is battery- <br /> operated, the batteries should be checked before and during the operation to ensure <br /> that a proper charge is maintained. As batteries lose charge the flow rate is lowered, <br /> effectively changing the purge rate. <br /> expand, drawing the soil gas from the probe into the bag. <br /> April 2012 21 <br />