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J \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4I5) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX (916)921 0100 <br /> Fugro West, Inc Client Project ID Shell, 2575 Country Club Blvd , Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Sod <br /> Roseville, CA 95678 <br /> Attention SudhakarTalanki QC Sample Group 5060292-294 Reported .tun 21, 1995 <br /> QUALITY CONTROL DATA REPORT j <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EC)A 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS061595 LCS061595 LCS061595 LCS061595 <br /> Date Prepared 6/15/95 6/15/95 6/15/95 6/15/95 <br /> Date Analyzed- 6/15/95 5/15/95 6/15/95 6/15/95 <br /> Instrument 1 D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> LCS % <br /> Recovery 92 93 94 92 <br /> Control Limits, 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# BS061595 BS061595 SS061595 8S061595 <br /> Date Prepared 6/15/95 6/15/95 6/15/95 6/15/95 <br /> Date Analyzed: 6/15/95 6/15/95 6/15/95 6/15/95 <br /> Instrument I D #- GCHP 2 GCHP-2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> % Recovery- 91 92 92 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 92 91 95 94 <br /> Relative % <br /> Difference- 1 1 11 32 22 <br /> i <br /> YOIA 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 GC limits for MS/MSG's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5060292 FUG [2> <br />