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NEI/GTEL Client ID BLAOICHV08 QUALITY CONTROL RESULTS <br /> Login Number W7450359 Volatile Organics <br /> Method EPA 8020A <br /> Project ID (number) 970521-H2 <br /> Project ID (name)- CHEVRON/9-1848/1257 YOSEMITE WEST/MANTECA/CA Matrix A ueous <br /> Matrix Spike(MS) Results <br /> GTEL Sample ID W7050359-03 MS ID MS05035903 <br /> Anal sis Date 28-MAY-97 28-MAY-97 <br /> Units ug/L Sample Spike MS MS Acceptability Limits <br /> Analyte Conc Added Conc Rec %Rec <br /> Benzene < 0 5 (0.000) 20 0 16 7 83 5 67-110 <br /> Toluene < 0 5 (0 000) 20 0 18 2 91 0 68-115 <br /> Ethylbenzene < 0 5 (0 000) 20 0 15,8 79,4 65-120 <br /> Xylenes (Total) < 0 5 (0 000) 60 0 50 2 83 7 62-119 <br /> Notes <br /> Values in parentheses in the sample concentration column are used for X recovery calculations <br /> NEI/GTEL Wichita, KS <br /> W7050359 6 <br />