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Sequoia 680 Chesapeake 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(5 10)686 9689 <br /> , ► Analytical 8t9 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 Water <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki QC Sample Goup 4120958-972 Reported Jan 4, 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 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#- LCS010395 LCS010395 LCS010395 LCS010395 <br /> Date Prepared 1/3/95 1/3/95 1/3/95 1/3/95 <br /> Date Analyzed 1/3/95 1/3/95 1/3/95 1/3/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 83 94 84 85 <br /> Control Limits. 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #- 4120969 4120969 4120969 4120969 <br /> Date Prepared 1/3/95 1/3/95 1/3/95 1/3/95 <br /> Date Analyzed 1/3/95 1/3/95 1/3/95 1/3/95 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery- 96 97 96 96 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 94 96 97 <br /> Relative% <br /> Difference. 00 31 00 10 <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 QC limits for MS/MSD's are advisory only <br /> lnda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4120958 FUG <4> <br />