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Tracer Research Corporation <br /> �L jI <br /> Table 2. Detection Limits for Groundwater Compounds <br /> Compound Detection Limits NO <br /> 1 <br /> benzene 0.2 <br /> toluene 0.4 <br /> ' eth Ylbenzene Q 8 <br /> xylenes 2 <br /> ' total volatile hydrocarbons 1 <br /> 6.0 QUALITY ASSURANCE AND QUALITY CONTROL <br /> Tracer Research's Quality Assurance (QA) and Quality Control (QC) <br /> program was followed to maintain data that was reproducible through the <br /> investigation. An overview presenting the significant aspects of this program is <br /> ' presented below. <br /> Soil Qas/Groundwatrj Sampling Quality ASSurance <br /> To ensure consistent collection of samples, the following procedures are <br /> ' performed: <br /> - Sampling 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 /> 19 pump. <br /> May 22.1992 page 6 1-92-358 <br /> 1 <br />