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' Sea uoia 680 <br /> Sequoia Chesapeake Drive Redwood City CA 94063 (415) 364 9600 i:AX (415) 364 9233 <br /> Analytical 1900 Bates Avenue Suite L Concord CA 94529 (510) 686 9600 FAX(510) 686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> ' Agro West, Inc Client Project ID Shell, 4315 Waterloo Rd , Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Soil <br /> Roseville, CA 95678 <br /> Attention David L Poulsen QC Sample Goup 4120491-498 Reported Dec 28, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Total <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 Barta <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# LCS122294 LCS122294 LCS122294 LCS122294 LCS121994 <br />' Date Prepared 12/22/94 12/22/94 12/22/94 12/22/94 12/19/94 <br /> Date Analyzed 12/22/94 12/22/94 12/22/94 12/22/94 12/22/94 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP 1 P-40 <br /> LCS <br /> Recovery 85 80 85 83 94 <br />' Control Limits 75-125 75-125 75-125 75-125 80-120 <br />' MS/MSD <br /> Batch # 4120496 4120496 4120496 4120496 4120492 <br />' Date Prepared 12/22/94 12/22/94 12/22/94 12/22/94 12/19/94 <br /> Date Analyzed 12/22/94 12/22/94 12/22/94 12/22/94 12/22/94 <br /> Instrument i D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 P-40 <br />' Matrix Spike <br /> % Recovery 80 80 80 83 87 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 85 85 85 87 78 <br />' Relative % <br /> Difference- 61 61 61 47 9 8 <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 /> PL <br /> � preparation and analytical methods employedfor 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 /> nda C Sclhnelderk+`7(- and are not used to accept or reject batch results <br /> Project Manager <br /> 4120491 FUG <4> <br /> T <br />