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a <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 111m, I,W Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> • EMCON Client Project ID ARCO 2130 Stockton CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Claudio Avila QC Sample Group 7080787-0798 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# 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 I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> • LCS % <br /> Recovery 101 90 94 93 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 7080789 7080789 7080789 7080789 <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 I D # GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 98 91 93 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 98 89 91 90 <br /> Relative% <br /> Difference 00 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 /> Xina <br /> preparation and analytical methods employed for the samples The LCS%recove data is used for <br /> validation of sample batch results nue to matrix effects the QC limits for MS/MSQs are advisory only <br /> Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora ory <br /> 7080787 EMC <5> <br />