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Ci� <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 6869600 FAX(510) 686 9689 <br /> 146V Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 x9161 921 9600 FAX(916)921 0100 <br /> Pugro West, Inc Client Project ID Shell, 141 N El Dorado, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Air <br />. Roseville, CA 95878 <br /> Attention Paul Graff OC Sample Goup 5020195-197 Reported Feb 10, 1995 <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 C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 ug/L 2 0 ug/L 2 0 ug/L 6 0 ug/L <br /> LCS Batch# LCS020895 LCS020895 LCS020895 LCS020895 <br /> Date Prepared 2/8/95 2/8/95 2/8/95 2/8/95 <br /> Date Analyzed 2/8/95 2/8/95 2/8/95 2/8/95 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> LCS % <br /> Recovery 94 93 94 94 <br /> . Control Limits 75-125 75-125 75 125 75 125 <br /> MS/MSD <br /> Batch # BLK020895 BLK020895 BLK020895 6LK020895 <br /> Date Prepared 2/8/95 2/8/95 2/8/95 2/8/95 <br /> Date Analyzed 2/8/95 2/8/95 2/8/95 2/8/95 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 94 93 94 94 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 102 101 102 101 <br /> Relative% <br /> Difference 82 82 8 2 72 <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 /> 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/MSDs are advisory only <br /> Onda C Schneider and are not used to accept or reject batch results <br /> Project Manager 5020195FlJU7F7 <br />