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Tracer Research Corporation <br /> 7 Soil Gas/Groundwater Sarnphng Quality Assurance <br /> To ensure consistent collection of samples, the following procedures are <br /> J.—A performed <br /> -� - Samphrig Manifolds <br /> Tracer Research's custom designed sampling manifold connects the sample <br /> probe to the vacuum line and pump The manifold is designed to eliminate sample <br /> exposure to the polymeric (plastic) materials that connect the probe to the vacuum <br /> pump <br /> l� <br /> The sampling manifold is attached to the end of the probe, forming an air <br /> tight union between the probe and the silicone tubing septum The septum connects <br /> the manifold to the pump vacuum line and permits syringe sampling <br /> This sampling system allows the sample to be taken upstream of the sampling <br /> pump, manifold, and septum Since cross contamination of sampling equipment can <br /> be a mayor problem, Tracer Research replaces the materials (probe and syringe), <br /> between sampling points, that contact the soil gas before or during sampling <br /> -Sampling Probes <br /> Steel probes are used only once each day To eliminate the possibility of <br /> cross contamination, they are washed with high pressure soap and hot water spray, or <br /> steam-cleaned Enough sampling probes are carried on each van to avoid the need to <br /> i re-use any during the day <br /> I ' -Glass Syringes <br /> Glass syringes are used for only one sample a day and are washed and baked <br /> out at night If they must be used twice, they are purged with carrier gas (nitrogen) <br /> and baked out between probe samplings <br /> l.� <br /> - Polyethylene Tubing and VOA Vials <br /> Polyethylene tubing and VOA vials used for the collection of groundwater <br /> samples are used only once and then discarded to avoid cross contamination <br /> July 19,M4 Page 7 11402915 <br /> L <br />