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GTEL Client ID BLA01CHV08 QUALITY CONTROL RESULTS <br /> ogin Number C5090126 Volatile Organics <br /> roject ID (number) 950911-A1 Method EPA8020/15 <br /> Project ID (dame) Chevron/#9-4275/2905 W Benjamin Holt Dr Stockton, CA Matrix Aqueous <br /> Matrix Spike(MS) and Matrix Spike Duplicate(MSD) Results <br /> GTEL Sample ID C5090048-19 MS ID MS09004819 MSD ID MD09004819 <br /> Analysis Date 08-SEP-95 16-SEP-95 16-SEP-95 <br /> Units ug/L Sample Spikes Added MS MS MSD MSD Acceptability Limits <br /> Analyte Conc MS MSD Conc % Rec Conc % Ree RPD RPD %Ree <br /> Benzene 2 2 (2 06) 20 0 20 b 24 8 214 24 8 114 0 0 34 57 3-139 <br /> Toluene 0 6 (0 597) 20 0 20 0 24 6 120 24 5 120 0 0 31 63-134 <br /> Ethylbenzene < 0 5 (0 000) 20 0 20 D 24 B 124 24 5 123 9-80 38 59 3-13X <br /> Xylenes (Total) 0 8 (0 842) 60 0 60 0 72 7 120 70 6 116 3 4 31 59 3-144 <br /> Notes <br /> Values in parentheses in the sample concentration column are used for % recovery calculations <br /> GTEL Concord, CA GTE L <br /> ENVIRONMTAL <br /> C5090126 2 LABORATORIES INC <br />