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Sequoia 680 Ch."ake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364-9233 <br /> 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510) 686-9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 1916) 921 9600 FAX (916) 921 0100 <br /> 0 <br /> 91 <br /> ro West Inc Client Project ID Shell, 141 N EI Dorado, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Air <br /> Roseville CA 95678 <br /> Attention Sudhakar Talanki QC Sample Goup 5030530-532 Reported Mar 20, 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 mg/m' 2 0 mg/m' 2 0 mg/m3 6 0 mg/m' <br /> LCS Batch# LCS031295 LCS031295 LCS031295 LCS031295 <br /> Date Prepared 3/12/95 3/12/95 3/12/95 3/12/95 <br /> Date Analyzed 3/12/95 3/12/95 3/12/95 3/12/95 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP 2 GCHP-2 <br />• LCS <br /> Recovery 99 100 100 99 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> i <br /> MS/MSD <br /> Batch # BLK031295 BLK031295 BLK031295 BLK031295 <br /> Date Prepared 3/12/95 3/12/95 3/12/95 3/12/95 <br /> Date Analyzed 3/12/95 3/12/95 3/12/95 3/12/95 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP 2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 99 100 100 99 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 99 99 100 99 <br /> Relative% <br /> Difference 00 10 00 00 <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 OC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5030530 FUG <2> <br />