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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4t5) 364 9600 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 <br /> (916) 921 9600 FAX (916) 921 0100 <br /> EA Engineering Client Project ID Exxon #7-3942, Stockton, CA <br /> 3841 N Freeway Blvd , #145 Matrix Air <br /> Sacramento, CA 95834 <br /> Attention Kynacos Kynacou QC Sample Group 703-0499 Reported Mar 18, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 6020 <br /> Analyst B Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m= 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS031497 LCS031497 LCS031497 LCS031497 <br /> Date Prepared 03/14/97 03/14/97 03/14/97 03/14/97 <br /> Date Analyzed 03/14/97 03/14/97 03/14/97 03/14/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 83 86 86 86 <br /> 1 Control Limits 70-130 70-130 70-130 70-130 <br />' MS/MSD <br /> Batch # SS031497 BS031497 BS031497 ES031497 <br />' Date Prepared 03/14/97 03/14/97 03/14/97 03/14/97 <br /> Date Analyzed 03/14/97 03/14/97 03/14/97 03/14/97 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 83 86 86 86 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 69 91 91 42 <br /> IRelative % <br /> Difference 7 0 56 5 6 67 <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 /> M �er— ` 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 OC limits for MS/MSD's are advisory only <br /> Edana M Belschner and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 7030499 EAE <2> <br />