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' 680 Chesapeake Drive Redwood Ci CA 94063 415 364 9600 FAX 415 364 92 <br /> Sequoia City ( ) ( ) 33 <br /> 404 N Wiget 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 /> 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 Kyriacou QC Sample Group 7030228-29 Reported Mar 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Kiri 17 12 7 <br />' ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> i <br />' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst B Williams B Williams 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# LCS031097 LCS031097 LCS031097 LCS031097 <br />' Date Prepared 03/10/97 03/10/97 03/10/97 03/10/97 <br /> Date Analyzed 03/10/97 03/10/97 03/10/97 03/10/97 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP-1 <br /> M LCS % <br /> Recovery 94 97 100 99 <br />' Control Limits 70-130 70-130 70-130 70-130 <br />' MS/MSD <br /> Batch # BS031097 BS031097 BS031097 BS031097 <br />' Date Prepared 03/10/97 03/10/97 03/10/97 03/10/97 <br /> Date Analyzed 03/10/97 03/10/97 03/10/97 03/10/97 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br />' Matrix Spike <br /> % Recovery 94 97 100 99 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 96 100 103 102 <br /> Relative % <br /> Difference 21 30 30 3 0 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> � M ��ey' 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 CC limits for MS/MSOs are advisory only <br /> Edana M Belschner and are not used to accept or reject batch results <br /> Project Manager/Sacramento LaSora ory <br /> 7030228 EAE K2> <br />