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Sequoia 680 Chesapeakc Drive Redwood City CA 94063 (415) 364 96W FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (5t0) 988 9600 FAX(510)988 9673 <br /> Analytical 8 t 9 Sinker Avenue Suttz 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 MO <br /> Grown &Caldwell Client Project ID ARCO 02133, Stockton, CA <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 7080752-0771 Reported Sep 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> 3enzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS082797 LCS082797 LCS082797 LCS082797 <br /> Date Prepared 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Date Analyzed 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Instrument 1 D # GGHP 7 GCHP-7 GCHP-7 GCHP 7 <br /> LCS <br /> Recovery 101 95 93 94 <br /> Control Limits 70 130 70-130 70-130 70 130 <br /> MS/MSD <br /> Batch # 7080800 7080800 7080800 7080800 <br /> Date Prepared 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Date Analyzed 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Instrument 1 ❑ # GCHP-7 GCHP-7 GCHP-7 GCHP 7 <br /> Matrix Spike <br /> % Recovery 98 93 92 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 94 93 92 <br /> Relative % <br /> Difference 20 1 1 1 1 0 0 <br /> SECS OlA ANALYTI AL 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/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora ory <br /> 7080752 BRS <11> <br />