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' Tracert search Corporation S ` 5.0 QUALITY ASSURANCE AND QUALITY CONTROL .Tracer Research's Quality Assurance (QA)-and Quality Control (QC) program was followed to maintain data that was reproducible through the investigation. An overview presenting the significant aspects of this program is presented below.- . Soil Gas SamplingQuality Assurance To ensure"consistent collection of soil°gas samples,-the"following procedures are performed: " - Sampling Manifolds �ITracer Research's custom designed sampling manifold connects the sample probe to the vacuum line'and pump. The manifold is designed to eliminate sample exposure to the polymeric (plastic) materials that connect the probe to'the vacuum pump. f h The sampling manifold attached to the end of the probe, forming an air tight union between the probe and the silicon tubing septum. The.septum connect the manifold to the pump vacuum lineand permits syringe sampling. This.sampling system allows the sample to be taken upstream of the sampling pump, manifold, and septum. Since cross contamination of.sampling equipment can be a major problem,.Tracer Research replaces the materials (probe and syringe), between i sampling points, that contact the soil gas before or during sampling. If the equipment is contaminated, all..the components are replaced. .At the end of each day the manifold is cleaned with soap and water and baked-in the GC oven. Sampling Probes Steel probes are used only once each day. To eliminate the possibility of cross contamination, they are washed with high pressure soap and hot water spray, or steam-cleaned. Enough sampling probes are carried on each van to avoid the need to re-use, any during the day. -Glass Syringes Glass syringes are usually used for only one sample a day and are washed and t baked out at night., If they must be used twice, they are"purged with carrier gas(nitrogen) and baked out between probe samplings. May 21, 1992 Page 5 1-92=302