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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (4 15) 364 9600 FAX (415) 364 9233 <br /> r V� Sequoia <br /> 404 '� W get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue Sune 8 Sacramento CA 95834 (916) 921 9600 FAX (916)92t 0100 <br /> A Engineering Client Project ID Exxon # RS 7-3942, Stockton, CA <br />' 3841 N Freeway Blvd , #145 Matrix Air <br /> Sacramento CA 95834 <br /> Attention Kyriacos Kyriacou OC Sample Group 7020615-16 Reported Feb 26, 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 B Williams B wt€Hams B Williams B Williams <br /> Concentration <br />' Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS022497 LCS022497 LCS022497 LCS022497 <br />' Date Prepared 02/24/97 02/24/97 02/24/97 02/24/97 <br /> Date Analyzed 02/24/97 02/24/97 02/24/97 02/24/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS °!° <br /> Recovery 87 90 90 91 <br />' Control Limits 70 130 70-130 70-130 70-130 <br />' MS/MSD <br /> Batch # BS022497 BS022497 BS022497 BS022497 <br />' Date Prepared 02/24/97 02/24/97 02/24/97 02/24/97 <br /> Date Analyzed 02/24/97 02/24/97 02/24/97 02/24/97 <br /> Instrument I ❑ # GCHP 7 GCHP 7 GCHP-7 GCHP-7 <br />' Matrix Spike <br /> % Recovery 87 90 90 91 <br />' Matrix Spike <br /> Duplicate % <br /> Recovery 92 94 95 96 <br />' Relative % <br /> Difference 5 6 43 54 53 <br /> LSEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using 1he same reagerlts <br /> 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 /> VEdana M Belschner and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br />' 7020614 EAE :2> <br />