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6) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (5t0) 686 9600 FAX(510) 686 9689 <br /> VCV Analytical 8 t 9 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> F=ugro West, Inc Client Project ID Shell, 2575 Country Club, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Sod <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki QC Sample Group 5050331-340 Reported May 18, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman K Berta <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br /> LCS Batch# LCS051095 LCS051095 LCS051095 LCS051095 LCS051095 <br /> Date Prepared- 5/10/95 5/10/95 5/10/95 5/10/95 5/10/95 <br /> Date Analyzed 5/10/95 5/10/95 5/10/95 5/10/95 5/15/95 <br /> Instrument 1 D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 P-40 <br /> . LCS % <br /> Recovery- 90 90 90 92 98 <br /> Control Limits 75-125 75-125 75-125 75-125 80-120 <br /> MS/MSD <br /> Batch # 5050463 5050463 5050463 5050463 5050335 <br /> Date Prepared 5/10/95 5/10/95 5/10/95 5/10/95 5/10/95 <br /> Date Analyzed 5/10/95 5/10/95 5/10/95 5/10/95 5/15/95 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 P-40 <br /> Matrix Spike <br /> % Recovery 90 90 90 93 99 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 90 95 95 97 <br /> Relative% <br /> Difference 5 4 00 54 21 20 <br /> SEQUOIA ANALYTICAL Please Nate <br /> r , The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> / f 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/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or refect batch results <br /> Project Manager 5050331 FUG <6> <br />