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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364.9233 <br /> 404 N.Wiget Lane Walnut Geek,CA 94598 (510) 988-9600 FAX(51o)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921-0100 <br /> *---E:::-M:::r`CON Client Project JD: Arco 2186, Stockton, CA <br /> 1 1433 N. Market Blvd, Matrix: Water <br /> Sacramento, CA 95834 <br /> Attention: Dave Foley QC Sample Group 8620465-0469 Reported: Mar 4, 1998<„ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes MTBE <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst: LMH LMB LMB LMB M.Williams <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 ug/L <br /> LCS Batch#: LCS022398 LCS022398 LCS022398 LCS022398 VMB0228S <br /> Date Prepared: 02/23/98 02/23/98 02/23/98 02/23/98 02/28/98 <br /> Date Analyzed: 02/23/98 02/23/98 02/23/98 02/23/98 02/28/98 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 H6 <br /> LCS <br /> Recovery: 91 89 86 85 106 <br /> Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch#: 8020458 8020458 8020458 8020458 9802102-01 <br /> Date Prepared: 02/23/98 02/23/98 02/23/98 02/23/98 02/28/98 <br /> Date Analyzed: 02/23/98 02/23/98 02/23/98 02/23/98 02/28/98 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 H6 <br /> Matrix Spike <br /> % Recovery: 96 93 92 90 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 100 99 97 95 105 <br /> Relative% <br /> Difference: 4.1 6.2 5.3 5.4 1.9 <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 /> J 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 limits for MS/MSD's are advisory only <br /> Ronald W. Bobel and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Laboratory <br /> 8020465.EMG <4> <br />