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1 <br /> VVZ1 INC <br /> 1 10 The PRT method will be used where only VOC soil gas is fudged potentially to be present <br /> as determined by soil boring screening, previous soil gas results, site history, and results <br /> ' from soil as sampling Using the PRT method will enable collection of soil as at four or <br /> 9 P 9 9 9 <br /> five discrete depths in one boring <br /> The sampling interval will be 0 5 to 3 feet depending upon the permeability of the interval <br /> Prior to soil gas sample collection, the system will be purged of one to two tubing volumes <br /> ' An PID will be used for optimization of purge volumes The soil gas will be collected when <br /> a maximum FID reading is achieved indicating that all the tubing volume has been <br /> ' removed A meter will monitor flow rates during sampling Soil gas samples will be <br /> collected in one-liter Tedlar bags at each sampling depth <br /> 1 <br /> One duplicate soil gas sample will be collected in a Tedlar bag for every 10 to 12 soil gas <br /> samples collected One soil gas sample will be collected each day and analyzed by a <br /> fixed base laboratory to confirm mobile laboratory identification of compounds This will <br /> abe referred to as the sample split One trip sample will be prepared each day by filling a <br /> ' Tedlar bag with nitrogen The trip sample will accompany soil gas samples collected in <br /> the field to the laboratory The pre labeled Tedlar bags will be placed in a non chilled, <br /> t light-tight insulated cooler for transport to the laboratory Sample information will be <br /> recorded on a chain of custody document Soil gas collection data (purge volume, vacuum <br /> ' pressure, sampling time, etc ) will be recorded on the Soil Gas Sampling Data sheet <br /> (Appendix III) All probes and sampling equipment will be cleaned and decontaminated <br /> ' prior to initiating work and following completion of work as described in Appendix III <br /> Borings will be abandoned with a bentonite/cement slurry through rods <br /> 1 <br /> i <br /> 12270020 025 7 <br />