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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 to)988 9673 <br /> 114I W Analytical 819 Striker Avenuc Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> A 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 7020490-91 Reported Feb 21, 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 S 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 /> 1 LCS Batch# LCS021997 LCS021997 LCS021997 LCS021997 <br />' Date Prepared 02/19/97 02/19/97 02/19/97 02/19/97 <br /> Date Analyzed 02/19/97 02/19/97 02/19/97 02/19/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP-7 GCHP 7 <br /> 1WLCS % <br /> Recovery 89 91 92 92 <br />' Control Limits 70-130 70 130 70-130 70130 <br /> MS/MSD <br /> Batch # BS021997 BS021997 BS021997 BSG21997 <br /> Date Prepared 02/19/97 02/19/97 02/19/97 02/19/97 <br /> Date Analyzed 02/19/97 02/19/97 02/19/97 02/19/97 <br /> Instrument I D # GCHP-7 GCHP 7 GCHP-7 GCHP-7 <br />' Matrix Spike <br /> % Recovery 89 91 92 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 92 94 95 96 <br />' Relative % <br /> Difference 33 32 32 42 <br /> SEQUOIA ANALYTICAL Please Mote <br /> The LCS 1s a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> f s 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/MSDs are advisory only <br /> kEcM BelSchner and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 7020490 EAE <2> <br /> gel <br />