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' 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> Sequoia 404 LN Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> �Ily Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9t6)921 0100 <br />' EA Engineering Client Project ID Exxon #3942 Stockton <br /> 3841 N Freeway Blvd , #145 Matrix Air <br /> Sacramento, CA 95834 <br /> Attention Kyrtacos Kyriacou QC Sample Group 702-0267 Reported Feb i], 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 Williams B Williams B Williams <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/ml 6 0 mg/m' <br /> LCS Batch# LSCO20797 LSCO20797 LSCO20797 LSCO20797 <br />' Date Prepared 02/07/97 02/07/97 02/07/97 02/07/97 <br /> Date Analyzed 02/07/97 02/07/97 02/07/97 02/07/97 <br /> Instrument I D # GCHP 7 3CHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 96 98 98 100 <br />' Control Limits 70-130 70-130 70-130 70-130 <br />' MS/MSD <br /> Batch # BS020797 BS020797 BS020797 BS020797 <br /> Date Prepared 02/07/97 02/07/97 02/07/97 02/07/97 <br /> Date Analyzed 02/07/97 02/07/97 02/07/97 02/07/97 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 96 98 98 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 97 99 100 100 <br /> t Relative % <br /> Difference 1 0 1 0 20 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed far the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> Edana M Belsehner and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br />' 7020267 EAE <2> <br />