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■ Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (SFO) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Srnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 9 n & Caldwell Client Project ID ARCO 02133, Stockton, CA <br /> 616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Steve Misner QC Sample Group 7060166-0195 Reported Jun 18, 1997 <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 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# LCS061697 LC8061697 LCS061697 LCS061697 <br /> Date Prepared 06/16/97 06/16/97 06/16/97 06/16/97 <br /> Date Analyzed 06/16/97 06/16/97 06/16/97 06/16/97 <br /> Instrument I D # GCHP-7 GCHP 7 GCHP-7 GCHP 7 <br /> LCS % <br /> • Recovery 98 92 91 90 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> 13atch # 7060374 7060374 7060374 7060374 <br /> Date Prepared 06/16/97 06/16/97 06/18/97 06/16/97 <br /> Date Analyzed 06/15/97 06/16/97 06/18/97 06/16/97 <br /> Instrument I D # GCHP 7 GCHP 7 GCHP 7 GCHP 7 <br /> Matrix Spike <br /> % Recovery 98 92 90 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 90 88 88 <br /> Relative % <br /> Difference 21 22 22 22 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> M j2t1GtATlD 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 limas for MS/MSD s are advisory only <br /> Edana M Fruclano and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 7060186 BRS <57 <br />