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819 Sinker Ave Ste S <br /> rY Sacramento C 95834 <br /> Sequoia (916)9221-9500 <br /> GFAX <br /> r O Analytical wwseq otala 01o0 <br /> www sequotalabs coin <br /> ttler-Ryan-Petaluma Pro}ect Tosco 11192,Stockton,CA 5212191 <br /> 1364 N McDowell Blvd Ste B2 Pro}ect Number NIA Reported <br /> Petaluma CA,94954 Pro}ect Manager Dave Vossler 12/20/02 13 28 <br /> Total Purgeable Hydrocarbon, BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Umts Level Result %REC Limits RPD Limit Notes <br /> Batch 2120200-EPA 5030B McOH <br /> Blank(2120200-BLKI) Prepared&Analyzed 12/16/02 <br /> Purgeable Hydrocarbons ND 050 mg/kg <br /> Benzene ND 00050 " <br /> Toluene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Methyl tent-butyl ether ND 00050 " <br /> Surrogate a a a-Triuorotoluene 00184 00200 92 60-140 <br /> Laboratory Control Sample(2120200-BS1) Prepared 12/16/02 Analyzed 12/19/02 <br /> Benzene 00163 00050 mg/kg 00200 82 70-130 <br /> Toluene 00167 00050 00200 84 70-130 <br /> 0-ylbenzene 00174 00050 00200 87 70-130 <br /> nes(total) 00508 00050 00600 85 70-130 <br /> Methyl tert-butyl ether 00167 00050 00200 84 70-130 <br /> Surrogate a a a-Trifluorotoluene 00161 00200 81 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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirely <br /> Page 5 of 7 <br />