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• Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> IQF <br /> Etna Environmental Client Project ID Shell, 7910 Lower Sacramento Rd, Stockton <br /> P 0 Box 259 Matrix Soil <br /> Sonoma, CA 95476-0259 <br /> Attention Thomas Manney QC Sample Group 7120768, 771, 775-776, 778, 781-782 Reported Jan 13, 1998 <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 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS122397 LCS122397 LCS122397 LCS122397 <br /> Date Prepared 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Date Analyzed 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Instrument I D # GGHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> LCS % <br /> Recovery 98 89 92 92 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 7121007 7121007 7121007 7121007 <br /> Date Prepared 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Date Analyzed 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 95 86 90 89 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 88 80 83 84 <br /> Relative % <br /> Difference 76 72 81 58 <br /> U A 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 /> alidatoon of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> In a C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> I 7120768A CES <10> <br /> R�) <br />