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D- <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> � Analytical 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9 16)921 0100 <br /> roWest, Inc Client Project 10 Shell, 141 N EI Dorado, Stockton, CA <br /> 50 Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki QC Sample Goup 4080970-972 Reported Sep 1, 1994 <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/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS082594 LCS082594 LCS082594 LCS082594 <br /> Date Prepared 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Date Analyzed 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Instrument 1 D # GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 90 90 95 93 <br /> Control Limits 75-125 75-125 75-125 75 125 <br /> MS/MSD <br /> Batch # BLK082594 BLK082594 BLK082594 BLK082594 <br /> Date Prepared 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Date Analyzed. 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Instrument I D.#• GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery -CO 90 95 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 85 85 87 <br /> Relative % <br /> Difference 57 57 11 67 <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 /> f� preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> / La 7 f validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4080970 FUG <3> <br />