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' "' , Sequoia 819 Straker Ave Ste 8 <br /> �- '� Sacramento CA 95834 <br /> (916)921 9606 <br /> Iwo Analytical V.1W se uoiala nlon <br /> wu"x sequoialabs corn <br /> Gettler-Ryan-Petaluma Project Tosco 6981,Stockton,CA 5305526 <br /> 1364 N McDowell Blvd Ste B2 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 06/04/03 17 28 <br /> Gasolme\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 Limit Notes <br /> Batch 3060024-EPA 5030B JP/Tl <br /> Laboratory Control Sample(3060024-BS2) Prepared&Analyzed 06/03/03 <br /> Benzene 147 050 ug/l 136 108 70-130 <br /> Toluene 982 050 834 106 70-130 <br /> Methyl tent butyl ether 21 6 050 224 96 60 140 <br /> Gasoline(C6-C10) 1080 50 1100 98 70 130 <br /> Surrogate 12 DCA-d4 214 25 0 86 60-140 <br /> Surrogate Toluene-d8 24 7 25 0 99 60-140 <br /> Surrogate 4 BFB 227 25 0 91 60-140 <br /> Matrix Spike(3060024-MSI) Source 5305581-01 Prepared&Analyzed 06/03/03 <br /> Benzene 13 4 050 ug/l 13 6 064 94 70 130 <br /> Toluene 820 050 834 13 97 70 130 <br /> Methyl tort butyl ether 225 050 224 ND 100 60 140 <br /> Gasoline(C6-C 10) 943 50 1100 ND 86 60-140 <br /> Surrogate 12 DCA-d4 167 250 ID7 60-140 <br /> Surrogate Toluene d8 247 250 99 60 140 <br /> Surrogate 4 BFB 242 15 0 97 60 140 <br /> Matrix Spike Dup(3060024-MSD1) Source 5305581-01 Prepared&Analyzed 06/03/03 <br /> Benzene 13 3 050 ug/I 136 064 93 70 130 0 7 25 <br /> Toluene 839 050 834 1 3 99 70 130 2 25 <br /> Methyl tert butyl ether 236 050 224 ND 105 60-140 5 25 <br /> Gasoline(C6 CIO) 944 50 1100 ND 86 60-140 0 1 25 <br /> Surrogate 12 DCA44 256 25 0 102 60-140 <br /> Surrogate Toluene d8 251 250 100 60-140 <br /> Surrogate 4-BFB 236 25 0 94 60 140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its enitrety <br /> Page 5 of 6 <br />