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F Tracer Research Corporation <br /> F <br /> J <br /> 1 52 Analyses <br /> Subsamples (replicate injections) of each soil gas and groundwater headspace <br /> JJ sam le were injected into the GC in volumes of 1 to 1,000 microliters (µL) The <br /> P <br /> detection limits for target compounds depend on the sensitivity of the detector to the <br /> ~- individual compound as well as the volume of the injection The detection limits of <br /> the target compounds were calculated from the response factor, the sample size, and <br /> the calculated minimum peak size (area) observed under the conditions of the <br /> analyses If any compound was not detected in an analysis, the detection limit is <br /> given as a "less than" value, e g , t0 1 µg/L The following table presents the <br /> approximate detection limits of the soil gas and groundwater targeted compounds <br /> Table 2 Detection Limits for Targeted Compounds <br /> Compound Detection Limits(}ig/L) <br /> 7— Benzene 003 sg 0 2 gr water <br /> 1� Toluene 005 sg 0 4 gr water <br /> LEthyl Benzene 0 1 sg 0 7 gr water <br /> Xylenes 0 1 sg 1 gr water <br /> TVHC 0 1 sg 1 gr water, <br /> 1 sg = Soil Gas gr water= Ground Water <br /> 6.0 QUALITY ASSURANCE AND QUALr1 Y 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 on the following pages <br /> k <br /> L <br /> July 19,1994 Page 6 1140291S <br /> i <br />