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' Tracer Research Corporation <br /> 5.2 Analyses <br /> Subsamples (replicate injections) of each soil gas and groundwater headspace <br /> sample were injected into the GC in volumes of 1 to 1,000 microliters (µL). The <br /> detection lirnits 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 lint is <br /> given as a "less than" value, e g , <0 1 µglL The following table presents the <br /> approximate detection limits of the soil gas and groundwater targeted compounds <br /> Table 2. Detection Lunits for Targeted Compounds <br /> Compound Detection Lmuts(ig/L) <br /> Benzene 003 sg 0 2 gr water <br /> Toluene 0 05 sg 0 4 gr water <br /> Ethyl 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 /> ' <br /> sg = Soil Gas gr water =Ground Water <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 on the following pages <br /> July 19 1994 Page 6 11402916 <br />