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J819 Striker Avenue Suite 8 <br /> 1 <br /> Sequoia <br /> o�a _ Sacramento C2 95$34 <br /> Il.i (91 G)921-9600 <br /> FAX <br /> Analytical 100 <br /> (916)9com <br /> www sequoialab5 abs com <br /> • <br /> Gettler-Ryan-Petaluma Project Former Tosco 6981,Stockton,CA 5208311 <br /> _ 1364 N McDowell Blvd Ste B2 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 08/29/02 14 28 <br /> Gaso11ne1BTEX\Oxygenates 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 ?Motes <br /> Batch 2080256-EPA 5030B JP/T] <br /> Blank(2080256-BLKl) Prepared&Analyzed 08/27/02 <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 050 " <br /> Gaso)ine(C6 C 10) ND 50 " <br /> Surrogate 12 DCA-d4 269 250 108 60-140 <br /> Surrogate Toluene-d8 24 7 250 99 60-140 <br /> Surrogate 4-BFB 252 250 101 60-140 <br /> Laboratory Control Sample(2080256-BS1) Prepared&Analyzed 08/27/02 <br /> Benzene 154 050 ugA 134 115 70-130 <br /> Toluene 83 5 050 81 0 103 70-130 <br /> Methyl tert butyl ether 284 050 218 130 60-140 <br /> Gasoline(C6 C 10) 1070 50 1100 97 70-130 <br /> Surrogate 1 2-DCA-d4 260 250 104 60-140 <br /> Surrogate Toluene-d8 239 250 96 60-140 <br /> Surrogate 4-11FB 247 25 0 99 60-140 <br /> Matrix Spike(2080256-MS1) Source 5208332-01 Prepared&Analyzed 08/27/02 <br /> Benzene 158 050 ug/1 134 ND 118 70-130 <br /> Toluene 855 050 81 0 067 105 70-130 <br /> Methyl tert-butyl ether 508 050 21 8 23 128 60-140 <br /> Gasoline(C6-Cl0) 1480 50 1100 ND 97 60-140 <br /> Surrogate 1 2-DCA-d4 250 250 100 60-140 <br /> Surrogate Toluene-d8 252 250 101 60-140 <br /> Surrogate 4-BFB 254 250 102 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 4 of 7 <br />