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819 Striker Ave Ste 8 <br /> j <br /> Sequoia q Sacramento CA 99634 <br /> '�'t'''r"" u��a (915)921 960D <br /> T4WAnalytical www <br /> seq 6) labs21 co 0 <br /> www sequoialabs tom <br /> 7ttler-Ryan-Petaluma Project Tosco 11192, Stockton,CA 5303556 <br /> 1364 N McDowell$lvd Ste B2 Project Number NIA Reported <br /> taluma CA,94954 Project Manager Dave Vossler 04/04/03 18 20 <br /> Gasolme\BTEXIOxygenates by EPA method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> -- Batch 3040041 -IEPA5030E-SPIT] ------ ------- �_._-- ---- ----- - --- - - - - - ------------ _------ ------ <br /> Laboratory Control Sample(3040041-BS1) Prepared&Analyzed 04/02/03 <br /> Benzene 145 050 ug/l 13 6 107 70-130 <br /> Toluene 868 050 834 104 70-130 <br /> Methyl tert-butyl ether 208 2 0 224 93 60-140 <br /> Gasolme(C6-CIO) 1340 50 1100 122 70-130 <br /> Surrogate Toluene-d8 257 250 103 60-140 <br /> Surrogate 4-BFB 258 250 103 60-140 <br /> Laboratory Control Sample(3040041-BS3) Prepared&Analyzed 04/04/03 <br /> Benzene 146 050 ug/l 13 6 107 70-130 <br /> Toluene 820 050 834 98 70-130 <br /> Methyl tert-butyl ether 212 20 224 95 60-140 <br /> dohne(C6-Cl0) 1290 50 1100 117 70-130 <br /> Surrogate Toluene-d8 254 250 102 60-140 <br /> Surrogate 4-BFB 260 250 104 60-140 <br /> Matrix Spike(3040041-MS1) Source 5303632-02 Prepared 04/02/03 Analyzed 04/03/03 <br /> Benzene 13 0 0 50 ug/l 13 6 ND 96 70-130 <br /> Toluene 746 0 50 83 4 096 88 70-130 <br /> Methyl tert-butyl ether 227 2 0 224 ND 101 60-140 <br /> Gasoline(C6-C 10) 1160 50 1100 ND 105 60-140 <br /> Surrogate Toluene-d8 254 25 0 102 60-140 <br /> Surrogate 4-BFB 261 25D 104 60-140 <br /> Matrix Spike Du (3040041-MSD1) Source S303632-02 Prepared 04/02/03 Analyzed 04/03/03 <br /> Benzene 152 050 ugll 13 6 ND 112 70-130 16 25 <br /> Toluene 85 7 0 50 834 086 102 70-130 14 25 <br /> Methyl tert-butyl ether 243 2 0 224 ND 108 60-140 7 25 <br /> Gasoline(C6 C10) 1230 50 1100 ND 112 60-140 6 25 <br /> Surrogate Toluene-d8 247 230 99 60-140 <br /> Surrogate 4-BFB 260 250 104 60-140 <br /> Sequoia Analytical- Sacramento The results in ihrs report apply to the samples analyzed in accordance with the thorn of <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 5 of 6 <br />