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819 Striker Ave Ste 8 <br /> a Sequoia Sacramento CA 95634 <br /> 921 900 <br /> 1W Analytical (916)921-01 <br /> FAX(91 fi 00 <br /> 0 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 /> Gasohne\BTEXIOxygenates by EPA method 8260B-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Aruilyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3070157-EPA 5030B[PIT] <br /> Blank(3070157-BLK1) Prepared&Analyzed 07_/11_/0_3 <br /> Benzene ND 050 ugn <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 1 0 " <br /> Gasoline(C6-CIU) ND 50 " <br /> Surrogate Toluene-d8 211 250 84 60-144 <br /> Surrogate 4-BFB 212 25 0 85 60-140 <br /> Laboratory Control Sample(30701-57-BSI)_ __ Prepared&AnalYzed 07/11/03 <br /> Benzene 14 6 0 50 ug/l 16 0 91 70-130 <br /> Toluene 82 2 0 50 74 2 111 70-130 <br /> thy]tent-butyl ether 275 2 0 24 8 1 1 1 60-140 <br /> ohne(C6-C10) 1160 50 1100 105 70-130 <br /> Surrogate Toluene-d8 204 25 0 82 60-140 <br /> Surrogate 4-BFB 235 25 0 94 60-140 <br /> Matrix Spike(307015.7-M_SI) Source 5306625-08 Prepared 07/11/03 Analyzed 07/12/03 „ <br /> Benzene 145 0 50 u9/1 160 ND 91 70-130 <br /> Toluene 798 0 50 H742 ND 108 70-130 <br /> Methyl tert-butyl ether 26 5 2 0 248 1 3 102 60-140 <br /> Gasoline(C6-C10) 989 50 1100 ND 90 60-140 <br /> Surrogate Toluene-d8 197 25 0 79 60-140 <br /> Surrogate 4-BFB 229 25 0 92 60-140 <br /> Matrix Spike Dup(3070157-MSD1) _ Source 5306625-08 _ Prepared 07/ 07/12/03 <br /> Benzene 145 0 50 u9/1 160 ND 91 70-130 0 25 <br /> Toluene 81 9 0 50 742 ND 110 70-130 3 25 <br /> Methyl tert-butyl ether 28 8 2 0 24 8 1 3 1 11 60-140 8 25 <br /> Gasoline(C6-C10) 1020 50 1100 ND 93 60-140 3 25 <br /> Surrogate Toluene-d8 197 15 0 79 60-140 <br /> Surrogate 4-BFB 239 25 0 96 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 15 of 18 <br />