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Sequoia680 Chesapeake Dnve Redwood City CA 94063 (415) 364 96W FAX(415) 364 9233 <br /> 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Vio- <br /> Brown & 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 u9/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS082697 LCS082697 LCS082697 LCS082697 <br /> Date Prepared 08/26/97 08/26/97 08/26/97 08/26/97 <br /> Date Analyzed 08/26/97 08/26/97 08/26/97 08/26/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP-7 GCHP 7 <br /> • LCS <br /> Recovery 97 92 90 90 <br /> Control Limits 70-130 70-130 70-130 70 130 <br /> MS/MSD <br /> Batch # 7080755 7080755 7080755 7080755 <br /> Date Prepared 08/26/97 08/26/97 08/26/97 08/26/97 <br /> Date Analyzed 08/26/97 08/26/97 08/26/97 08/26/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP 7 GCHP 7 <br /> Matrix Spike <br /> % Recovery 91 87 86 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 93 88 87 86 <br /> Relative % <br /> Difference 22 1 1 1 2 1 2 <br /> SE OlA ANQLYT AL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> reid <br /> preparation and analytical methods employed for the samples The LC5%recovery data rs used for <br /> (� validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> Linda C S and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 7080752 BRS <10> <br />