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819 Sinker Ave Ste 8 <br /> Sequoia Sacra nto,CA95834 <br /> Analytical equoia 21-9600 <br /> FAX(916)921-0100 <br /> www sequoielabs coin <br /> Gettler-Ryan-Dublin Project TOSCO 11192,Stockton,CA S305429 <br /> 6747 Sierra Court,Ste J Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 05/29/03 17 15 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunit Notes <br /> Batch 3050466-EPA 5030B [P/TJ <br /> Laboratory Control Sample(3050466-BS1) Prepared_&_ Analyzed 05/2.7/_03 <br /> Benzene 131 050 ug/l 13 6 96 70-130 <br /> Toluene 764 050 834 92 70-130 <br /> Methyl tert-butyl ether 192 20 224 86 60-140 <br /> Gasoline(C6-C10) 923 50 1100 84 70-130 <br /> Surrogate Toluene-d8 264 250 106 60-140 <br /> Surrogate 4-BFB 256 250 101 60-140 <br /> Laboratory Control Sample(3050466-BS2) Prepared&Analyzed 05/28/03 <br /> Benzene 137 050 ug/l 136 101 70-130 <br /> Toluene 864 050 934 104 70-130 <br /> Methyl tert-butyl ether 17 3 20 224 77 60-140 <br /> Gasoline(C6-C10) 1110 50 1100 101 70-130 <br /> Surrogate Toluene-d8 Y 273 250 109 60-140 ^ <br /> Surrogate 4-BFB 151 250 101 60-140 <br /> Batch 3050475-EPA 5030B INTI <br /> Blank(3050475-BLK1) Prepared 05/27/03 Analyzed 05/28/03 <br /> Benzene _. ... ND 050 ug/1 „�.. _ ...., <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Gasoline(C6-CIO) ND 50 " <br /> Surrogate Toluened8 260 250 104 60-140 <br /> Surrogate 4-BFB — r 195 _ 250 78 _ 60-140 <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 23 <br />