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Sequoia 95834 819 Striker Ave Sacramento CA 95834 <br /> 4(D4 (916)921 9600 <br /> A n`.91 V t1 C a l FAX(916)921 0100 <br /> J www sequoialatis con, <br /> EGcr-Ryan-Petaluma Project Tosco 11192,Stockton,CA 5212209 N McDowell Blvd Ste B2 Protect Number N/A Reported <br /> uma CA 94954 Project Manager Dave Vossler 12/31/02 11 16 <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 Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2120200-EPA 5030E (MeoH) <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 tert-butyl ether ND 00050 " <br /> Surrogate a a a-Trijiuorotoluene 00184 00200 92 60-140 <br /> Blank(2120200-BLK2) Prepared&Analyzed 12/12/02 <br /> Purgeable Hydrocarbons ND 0 10 mg/kg <br /> Benzene ND 00050 " <br /> Toluene ND 00050 <br /> Ethylbenzene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Surrogate a a a-Triuorotoluene 00137 00200 68 60-140 <br /> Blank(2120200-BLK3) Prepared 12/18/02 Analyzed 12/20/02 <br /> Purgeable Hydrocarbons ND 0 10 mg/kg <br /> Benzene ND 00050 " <br /> Toluene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Surrogate a a a-Triuorotoluene 00150 00200 75 60-140 <br /> Laboratory Control Sample(2120200-BSI) 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 /> Ethylbenzene 00174 00050 00200 97 70-130 <br /> Xylenes(total) 00509 00050 00600 85 70-130 <br /> Methyl cert-butyl ether 00167 00050 00200 84 70-130 <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 entirety <br /> Page 6 of 13 <br />