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T` - - - _ -_ _ _ Tl--�w�r+.- _ - _ter_- _ - e. i Tracer Renearah Corporation particular, the sample size. If any component being analyzed was not detected, the detection limit for that compound in that analysis is given as a"less than"value(e.g. < 0.1 ug/L,). Detection limits obtained from GC analyses were calculated from the current response factor, the sample size, and the estimated minimum peak size (area) that would have been visible under the conditions of the measurement, QUALJE:'Yl ASSURANCE/QUALI'l<"Y CONTROL PROCCDUFES Tracer Research Corporation's normal quality assurance procedures were followed in order to prevent any cross-contamination of soil gas samples. These procedures are _. described below: Steel probes are used only once during the clay and then washed with high pressure soap and hot %;pater spray or steam-cleared to eliminate the possibility of cross-contamination. Enough probes are carried on each van to avoid the no,-yd to reuse any during the day. Probe adaptors(TRC's patented design)are used to connect the sample probe to the vacuum pump.The adaptor is designed to eliminate the possibility of exposing the sample stream to any part of the adaptor. Associated tubing connecting the adaptor to the vacuum pump is replaced periodically as needed during the job to insure cleanliness and good M. At the end of each day the adaptor is cleaned with soap and water and baked in the GC oven. Silicone tubing(which acts as a septum for the syringe needle)is replaced as needed to insure proper sealing around the syringe needle. This tubing does not directly contact soil gas samples. Glass syringes are usually used for only one sample per day and are washed and baked out at night. If they must be used twice, they are purged with carrier gas (nitrogen) and baked out between probe samplings. 5