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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916) 00 <br /> FAX <br /> sequoialabs alabs com <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton,CA <br /> 6747 Sierra Court,Ste J Project Number C-Sparge Test Reported <br /> Dublin CA 94568 Project Manager P LeCheminant 02/22/01 18 49 <br /> Total Purgeable Hydrocarbons (C6-C12), 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 1020225-EPA 5030B (P/T) <br /> Blank(1020225-BLKI) Prepared&Analyzed 02/21/01 <br /> Purgeable Hydrocarbons ND 500 ug/l <br /> Benzene ND 0 500 " <br /> Toluene ND 0 500 " <br /> Ethylbenzene ND 0 500 " <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 250 <br /> Surrogate a a a-Trifluorotoluene 10 4 100 104 60-140 <br /> LCS(1020225-BSI) Prepared&Analyzed 02/21/01 <br /> Benzene 840 0 500 ug/I 100 840 70-130 <br /> ene 880 0 500 100 880 70-130 <br /> lbenzene 893 0 500 100 893 70-130 <br /> Xylenes(total) 269 0 500 300 897 70-130 <br /> Methyl tent-butyl ether 12 2 2 50 100 122 70-130 <br /> Surrogate a a a-Trifluorotoluene 926 100 92 6 60-140 <br /> Matrix Spike(1020225-MSI) Source 5102261-01 Prepared&Analyzed 02/21/01 <br /> Benzene 988 0 500 ug/l too ND 988 60-140 <br /> Toluene 10 2 0 500 100 ND 102 60-140 <br /> Ethylbenzene 105 0 500 10 0 ND 105 60-140 <br /> Xylenes(total) 31 2 0 500 300 ND 104 60-140 <br /> Methyl tert-butyl ether 930 250 100 ND 930 60-140 <br /> Surrogate a a a-TriJluorotoluene 104 1019 104 60-140 <br /> Matrix Spike Dup(1020225-MSD1) Source S102261-01 Prepared&Analyzed 02/21/01 <br /> Benzene 961 0 500 ug/1 10 0 ND 961 60-140 2 77 25 <br /> Toluene 10 0 0 500 100 ND 100 60-140 198 25 <br /> Ethylbenzene 10 3 0 500 l0 0 ND 103 60-140 1 92 25 <br /> Xylenes(total) 305 0 500 300 ND 102 60-140 227 25 <br /> Methyl tert-butyl ether 951 2 50 100 ND 951 60-140 223 25 <br /> Surrogate a a a-Trifluorotoluene 101 100 101 60-140 <br /> quota Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> page 6 of 7 <br />