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STANDARD OPERATING PROCEDURE <br /> FIELD SOIL VAPOR MONITORING <br /> • A representative soil sample will be collected from each sample interval and placed in a Ziplocke plastic <br /> bag The bag will be sealed and the soil dissaggregated At least ten minutes will be allowed for the soil to <br /> be heated by direct sunlight and for any VOCs in the soil to accumulate in the headspace of the bag <br /> Volatile gases will then be monitored by inserting the probe of a Photovac 2020 photoionization detector <br /> (PID) The PID is equipped with a 10 6 eV lamp which is capable of detecting VOCs at concentrations of <br /> 0 1 parts per million (ppm) The PID will be calibrated on-site using 100-ppmV isobutylene-in-air span gas <br /> (equivalent to benzene)prior to drilling operations PID readings will be recorded in the boring logs <br /> I <br /> f <br />