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• a Sinker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical FAX(916)921 0108 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 11193, Stockton,CA S306625 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/30/03 13 04 <br /> Gasoline (2-Metbylpentane to 1,2,4-Trlmethylbenzene) and BTEX by EPA 8015M and 8021B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3070114-EPA 5030B(PIT) <br /> Laboratory Control Sample(3070114-BSI) _ Prepared&Analyzed 07/08/03 <br /> Benzene 9 59 0 50 ug/1 10 0 96 70-130 <br /> Toluene 9'70 0 50 10 0 97 70-130 <br /> Ethylbenzene 945 0 50 100 94 70-130 <br /> Xylenes(total) 284 0 50 30 0 95 70-130 <br /> Methyl tert-butyl ether 109 2 0 10 0 109 70-130 <br /> Surrogate a a,a-Trfluorotoluene 917 10 0 92 60-140 <br /> Laboratory Control Sample 3070114-13S2 Pre aced&Analyzed 07/09/03 <br /> Benzene 8 80 0 50 up/l 100 88 70-130 <br /> Toluene 9 03 0 50 10 0 90 70-130 <br /> Ethylbenzene 8 88 0 50 10 0 89 70-130 <br /> Xylenes(total) 27 2 0 50 30 0 91 70-130 <br /> thyl tent-butyl ether 9 18 2 0 10 0 92 70-130 <br /> 'qWrrogate a a a-Trifluorotoluene 8 75 100 - 88 60-140 <br /> Laboratory Control Sample(3070114-BS3) _ Prepared&Analyzed 07/10/03 <br /> Benzene 9 54 0 50 u8A 10 0 95 70-130 <br /> Toluene 9 86 0 50 10 0 99 70-130 <br /> Ethylbenzene 9 70 0 50 too 97 70-130 _- <br /> Xylenes(total) 290 0 50 300 97 70-130 <br /> Methyl tert-butyl ether 9 79 2 0 10 0 98 70-130 <br /> Surrogate a a a-Trifluorotoluene 9 62 100 96 60-140 <br /> Laboratery Control Sample 3070114-BS4 Prepared&Analyzed 07/14/03 <br /> Benzene 8 97 0 50 ug/l 10 0 90 70-130 <br /> Toluene 9 04 0 50 10 0 90 70-130 <br /> Ethylbenzene 8 86 0 50 10 0 89 70-130 <br /> Xylenes(total) 25 8 0 50 300 86 70-130 <br /> Methyl tert-butyl ether 9 27 2 0 10 0 93 70-130 <br /> Surrogate a,a,a-Trifluorotoluene 101 100 101 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 13 of 18 <br />