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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 <br /> Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Stinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> FugroV4test;Inc h` Client project ID Shell, 4315 Waterloo Ad , Stockton,"CA` <br />' 1050 Melody Lane, Ste 160 Matmc Sod <br /> Roseville, CA 95678 <br /> Attention Kurt Martin QC Sample Goup 4120482-490 Reported Dec 16, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Organic <br />' Benzene Toluene Benzene Xylenes Lead <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 Luft <br />' Analyst C Chapman C Chapman C Chapman C Chapman D Ballard <br /> Concentration <br /> Spiked. 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 0 50 mg/Kg <br />' LCS Batch#- LCS121594 LCS121594 LCS121594 LCS121594 LCS121694 <br /> Date Prepared 12/15/94 12/15/94 12/15/94 12/15/94 12/16/94 <br /> Date Analyzed' 12/15/94 12/15/94 12/15/94 12/15/94 12/16/94 <br /> Instrument I D #' GCHP 1 GCHP-1 GCHP-1 GCHP-1 SH 1000 <br /> LCS % <br /> Recovery 76 75 77 76 83 <br />' Control Limits. 75-125 75-125 75 125 75-125 80-120 <br />' MS/MSD <br /> Batch#- 4120580 4120580 4120580 4120580 4120490 <br />' Date Prepared' 12/15/94 12/15/94 12/15/94 12/15/94 12/16/94 <br /> Date Analyzed- 12/15/94 12/15/94 12/15/94 12/15/94 12/16/94 <br /> Instrument I D.#' GCHP-1 GCHP-1 GCHP-1 GCHP-1 SH 1000 <br />' Matrix Spike <br /> % Recovery, 90 95 95 95 86 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 90 90 95 95 87 <br /> Relative% <br /> Difference: 00 5 4 00 00 1 2 <br /> SEQUOIA ANALYTICAL Please Note <br /> i The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> '0nCN�C preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> C' Ze e e L"r validation of sample batch results Due to matrix affects,the GC 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 4120482 FUG <15> <br />