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819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> 4D (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> WO www sequoialabs com <br /> tler-Ryan-Rancho Cordova Project Unocal 0187,Stockton,CA <br /> 40 Gold Camp Dr,Ste 170 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager David Herzog 03/04/02 16 09 <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 2030025-EPA 5030B(P/T) <br /> Blank(2030025-BLK1) Prepared&Analyzed 03/01/02 <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-Trifluorotoluene 00166 00200 83 0 60-140 <br /> LCS(2030025-BS1) Prepared&Analyzed 03/01/02 <br /> Benzene 00168 00050 mg/kg 00200 84 0 70-130 <br /> Toluene 0 0172 00050 00200 860 70-130 <br /> Ethylbenzene 00192 00050 00200 960 70-130 <br /> lenes(total) 0 0553 00050 00600 922 70-130 <br /> yl tert-butyl ether 00257 00050 00200 128 70-130 <br /> Surrogate a,a,a-Trifluorotoluene 00172 00200 860 60-140 <br /> Matrix Spike(2030025-MSI) - Source S20_2316-04 Prepared&Analyzed 03/01/02 <br /> Benzene 00171 00050 mg/kg 00200 ND 85 5 60-140 <br /> Toluene 00170 00050 00200 ND 850 60-140 <br /> Ethylbenzene 00194 00050 00200 ND 970 60-140 <br /> Xylenes(total) 0 0546 00050 00600 ND 91 0 60-140 <br /> Methyl tert-butyl ether 0 0183 00050 00200 ND 91 5 60-140 <br /> Surrogate a a a-Trifluorotoluene 00171 00200 855 60-140 <br /> Matrix Spike Du 2030025-MSD1 Source 5202316-04 Pre ared&Analyzed 03/01/02 <br /> Benzene 00163 00050 mg/kg 00200 ND 81 5 60-140 479 25 <br /> Toluene 00165 00050 00200 ND 82 5 60-140 299 25 <br /> Ethylbenzene 00188 00050 00200 ND 940 60-140 3 14 25 <br /> Xylenes(total) 00536 00050 00600 ND 893 60-140 1 85 25 <br /> Methyl Cert-butyl ether 00170 00050 00200 ND 85 0 60-140 7 37 25 <br /> Surrogate a,a a-Trifluorotoluene 00175 00200 875 60-140 <br /> uom Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 7 of 9 <br />