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819 Sinker Ave Ste 8 <br /> (1), Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> WO Analytical FAX(916)9210100 <br /> www sequoialabs coin <br /> eider-Ryan-Petaluma Project Tosco 1]192,Stockton,CA S212209 <br /> ]364 N McDowell Blvd Ste B2 Project Number NIA Reported <br /> Petaluma CA,94954 ProjectManager 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 5030B McOH) <br /> Laboratory Control Sample(2120200-BS1) Prepared 12/16/02 Analyzed 12/19/02 <br /> Surrogate a a a Trifluorotoluene 00161 mg/kg 00200 81 60-140 <br /> Laboratory Control Sample(2120200-BS2) Prepared&Analyzed 12/12/02 <br /> Benzene 00123 00050 mg/kg 00200 62 70-130 <br /> Q LIM <br /> Toluene 00160 00050 00200 80 70-130 <br /> Ethylbenzene 00175 00050 00200 88 70-130 <br /> Xylenes(total) 00570 00050 00600 95 70-130 <br /> Methyl tert-butyl ether 00139 00050 00200 70 70-130 <br /> Surrogate a a a-Trifluorotoluene 00137 00200 68 60-140 <br /> Jftboratory Control Sample(2120200-BS3) Prepared 12/18/02 Analyzed 12/20/02 <br /> nzene 1 64 00050 mg/kg 200 82 70-130 <br /> Toluene 1 69 00050 200 84 70-130 <br /> Ethylbenzene l 76 00050 200 88 70-130 <br /> Xylenes(total) 520 00050 600 87 70-130 <br /> Methyl Cert-butyl ether 1 76 00050 200 88 70-130 <br /> Surrogate a a a-Trifluorotoluene 00150 00200 75 60-140 <br /> Matrix Spike(2120200-MSI) Source 5212186-09 Prepared 12/16/02 Analyzed I2/18/02 <br /> Benzene 00141 00050 mg/kg 00200 ND 70 60-140 <br /> Toluene 00141 00050 00200 ND 70 60-140 <br /> Ethylbenzene 00139 00050 00200 ND 70 60-140 <br /> Xylenes(total) 00370 00050 00600 ND 62 60-140 <br /> Methyl tert-butyl ether 00163 00050 00200 ND 82 60-140 <br /> Surrogate a a a-Trifluorotoluene 00147 00200 74 60-140 <br /> Matrix Spike Dup(2120200-MSDI) Source 5212186-09 Prepared 12/16/02 Analyzed 12/18/02 <br /> Benzene 00149 00050 mg/kg 00200 ND 74 60-140 5 25 <br /> Toluene 00147 00050 00200 ND 74 60-140 4 25 <br /> Ethylbenzene 00144 00050 00200 ND 72 60-140 4 25 <br /> Xylenes(total) 00382 00050 00600 ND 64 60-140 3 25 <br /> quota 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 7 of 13 <br />