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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (4t5) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (5 10) 988 9600 FAX(510)988 9673 <br /> X1,1 Analytical 8t9 Sinker Avenue Suite 8 Sacramento CA 95834 (9 16) 921 9600 FAX(916)921 WOO <br /> *own & 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 /> 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# LCS082597 LCS082597 LCS082597 LCS082597 <br /> Date Prepared 08/25/97 08/25/97 08/25/97 08/25/97 <br /> Date Analyzed 08/25/97 08/25/97 08/25/97 08/25/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP-7 GCHP 7 <br /> LCS <br /> Recovery 116 108 105 106 <br /> Control Limits 70-130 70-130 70.130 70-130 <br /> MS/MSD <br /> Batch # 7080730 7080730 7080730 7080730 <br /> Date Prepared 08/25/97 08/25/97 08/25/97 08/25/97 <br /> Date Analyzed 08/25/97 08/25/97 08/25/97 08/25/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP 7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 111 105 109 106 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 114 110 111 107 <br /> Relative % <br /> Difference 27 46 18 0 94 <br /> SEQDIA ANALYTI AL Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSO s are advisory only <br /> tnda C Schneider and are not used to accept or reject batch results <br /> Pro]ect Manager/Sacramento Labora ory <br /> 7080752 BRS <9> <br />