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Sequoia 680 Chesapeake Drivc 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 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <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 /> 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# LCS032798 LCS032798 LCS032798 LCS032798 <br /> Date Prepared 03/27/98 03/27/98 03/27/98 03/27/98 <br /> Date Analyzed 03/27/98 03/27/98 03/27/98 03/27/98 <br /> Instrument I D # GGHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> . LCS % <br /> Recovery 92 93 93 91 <br /> Control Limits 70-130% 70-130% 70-130% 70130% <br /> MS/MSD <br /> Batch # 8031009 8031009 8031009 8031009 <br /> Date Prepared 03/27/98 03/27/98 03/27/98 03/27/98 <br /> Date Analyzed 03/27/98 03/27/98 03/27/98 03/27/98 <br /> Instrument I D # GCHP 2 GGHP-2 GCHP-2 GGHP-2 <br /> Matrix Spike <br /> % Recovery 91 92 92 91 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 94 93 94 94 <br /> Relative % <br /> Difference 32 1 1 22 3 2 <br /> .SE0U IA ANALYTICAL Please Note <br /> The LCS is 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 Is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSI)s are advisory only <br /> /ir6/d'a'C Schneider and are not used to accept or reject batch results <br /> ect Manager/Sacramento Laboratory <br /> 8030992 SES <12> <br />