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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(5 Eo)9s8 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 45834 (916) 921 9600 FAX(916)921 0100 <br /> Caa <br /> mhrl Environmental Client project ID Shell, 7910 Lower Sacramento Fld, Stockton <br /> P O 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 MTBE <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst C Lee C Lee G Lee C Lee M Williams <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 4 20 mg/kg 0 60 mg/kg 2500 ug/kg <br /> LCS Batch# LCS122397 LCS122397 LCS122397 LCS122397 LCS 122597 <br /> Date Prepared 12/23/97 12/23/97 12/23/97 12/23/97 12/26/97 <br /> Date Analyzed 12/23/97 12/23/97 12/23/97 12/23/97 12/29/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 H6 <br /> LCS i <br /> Recovery 94 89 87 87 88 <br /> Control Limits 70-130 70-130 70 130 70-130 70-130 <br /> MS/MSD <br /> Batch # 7121027 7121027 7121027 7121027 9712EO901 <br /> Date Prepared 12/23/97 12/23/97 12/23/97 12/23/97 12/26/97 <br /> Date Analyzed 12/23/97 12/23/97 12/23/97 12/23/97 12/29/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 F2 <br /> Matrix Spike <br /> % Recovery 88 84 83 82 95 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 81 78 79 76 99 <br /> Relative % <br /> Difference 83 74 36 76 39 <br /> 7QU- ANALYTICA 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/MSDs are advisory only <br /> chneider and are not used to accept or reject batch results <br /> nager/Sacramento Labora or <br /> 7120768A CES <11> <br />