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Sequoia 660 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 Stnkcr 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 1 D # GGHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> • LCS % <br /> Recovery r 92 92 93 91 <br /> Control Limits 70130% 70-130% 70-130% 70130% <br /> MS/MSD <br /> Batch# 8031064 8031064 8031064 8031064 <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-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> Recovery 87 88 88 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 86 89 90 90 <br /> Relative% <br /> Difference 1 2 1 1 22 00 <br /> ,SEQU IA ANALYT ,,AL Please Note <br /> f 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 LGS%recovery data is used for <br /> v <br /> / v validation of sample batch results Due to matrix effects the QC Ismts for M5 MSDs are advisory only <br /> inda C SC nelder and are not used to accept or refect match results <br /> Project Manager/Sacramento Lab ara ory <br /> $030992 SES <13> <br />