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Sequoia 660 Chesapeake Drive Redwood City, CA 94063 (415) 364-9600 FAX (415) 364 9'233 <br /> 15) 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Iwo Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> � <br /> gro West, Inc Client Project ID Shell, 141 N EI Dorado, Stockton, CA <br /> 50 Melody Lane, Ste 160 Matra Air <br /> Roseville, CA 95678 <br /> Attention SudhakarTalankl QC Sample Goup 4100155-157 Reported Oct 11, 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/m' 2 0 mg/m3 2 0 mg/ml 6 0 mg/m3 <br /> LCS Batch#' LCS100594 LCS100594 LCS100594 LCS100594 <br /> Date Prepared. 10/5/94 10/5/94 10/5/94 10/5/94 <br /> Date Analyzed 10/5/x4 10/5/94 10/5/94 10/5/94 <br /> instrument I ❑.#' GCHP 2 GCHP-2 GCHP 2 GCHP-2 � <br /> I <br /> LCS % <br /> Recovery 95 95 95 95 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# BLK100594 BLK100594 BLK100594 BLK100594 <br /> Date Prepared: 10/5/94 10/5/94 10/5/94 10/5/94 <br /> Date Analyzed. 1015/94 10/5/94 10/5/94 10/5/94 <br /> Instrument I.D.#• GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 95 95 95 95 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 90 90 90 90 <br /> Relative % <br /> Difference: 54 54 54 54 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzes 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/MWs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4100155 FUG <3> <br />