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• J - ' Sequoia 610 a—p-ke Dn,c Red+ .d C.ty CA 94063 (415) 364 %00 FAX (415) 364 9233 <br /> 1�..� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenge Sere 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 OtOO <br /> lbbwn & Caldwell Client Project ID ARCO 02133, Stockton, CA <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner OC Sample Group 7060186-0195 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# LCS061797 LCS061797 LCS061797 LCS061797 <br /> Date Prepared 06/17/97 06/17/97 06/17/97 06/17/97 <br /> Date Analyzed 06/17/97 06/17/97 06/17/97 06/17/97 <br /> Instrument I D # GCHP-7 GCHP 7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 101 95 93 93 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 7060326 7060326 7060326 7060326 <br /> Date Prepared 06/17/97 06/17/97 06/17/97 06/17/97 <br /> Date Analyzed 06/17/97 06/17/97 06/17/97 05/17/97 <br /> Instrument l D # GCHP-7 GCHP 7 GCHP 7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 90 84 82 83 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 91 85 83 83 <br /> Relative % <br /> Difference 1 1 12 1 2 00 <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 /> *A M FAV0 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 OC limits for MS/MSDs are advisory only <br /> Edana M Fruclano and are not used to accept or reject Gatch results <br /> Project Manager/Sacramento Laboratory <br /> 7060186 BRS <7> <br />