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Sequoia 680 Chesapeake Dnve 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(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Fugro West, Inc n Client Project 11)' 'Shell,'141 N El Dorado, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Air <br /> Ilosevifle, CA 95678 <br /> Attention Sudhakar Talankl OC Sample Group 5100154-155 Reported Oct 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 mg/m-1 2 0 mg/m, 2 0 mg/m' 6 0 mg/ma <br /> LCS Batch# LCS100595 LCS100595 LCS100595 LCS100595 <br /> Date Prepared 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Date Analyzed- 10/5/95 10/5/95 10/5/95 14/5/95 <br /> Instrument I.D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 104 102 103 102 <br /> Control Limits- 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# BS100595 BS100595 SS100595 BS100595 <br /> Date Prepared- 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Date Analyzed. 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Instrument I.D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 102 100 103 103 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 94 94 96 93 <br /> Relative% <br /> Difference. 82 62 7 0 10 <br /> SEQUOIA ANALYTICAL Please Dote <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> ` �+/�(/ � � !`r�/ preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> �/ c ( ` ( I validation of sample hatch results Due to matrix effects,the QC limits for MS MSD s are advisory only <br /> Inda C Schneider and are not used to accept or reject batch results <br /> Project Manager 5100154 F1.3 <2> <br />