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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> IQF <br /> �SECOR Client Project ID ARCO 2133, Stockton CA <br /> 3050 Fite Circle, Ste 204 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Rusty Benkosky QC Sample Group 8030992-1011 Reported Apr 7, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst L Bettencourt L Bettencourt L Bettencourt L Bettencourt <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS032698 LCS032698 LCS032698 LCS032698 <br /> Date Prepared 03/26/98 03/26/98 03/26/98 03/26/98 <br /> Date Analyzed 03/26/98 03/26/98 03/26/98 03/26/98 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP 7 GCHP-7 <br /> LCS <br /> Recovery 91 92 91 90 <br /> Control Limits 70-130% 70-130% 70 130% 70-130% <br /> MS/MSD <br /> Batch # 8030992 8030992 8030992 8030992 <br /> Date Prepared 03/26/98 03/26/98 03/26/98 03/26/98 <br /> Date Analyzed 03/26/98 03/26/98 03/26/98 03/26/98 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP 7 GCHP 7 <br /> Matrix Spike <br /> % Recovery 87 90 88 89 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 91 90 91 <br /> Relative% <br /> Difference 2 3 1 1 2 2 2 2 <br /> 7inrda <br /> SEQU IA ANALYTI AL Please Note <br /> The LCS 1s a control sample of known, interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used fot <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> C Schneider and are not used to accept or reject batch results <br /> otect Manager/Sacramento Lahora ory <br /> 8030992 SES <11> <br />