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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA <br /> 95834 <br /> (916)921-9600-9600 <br /> FAX(916)921-1100 <br /> Analytical www sequolalabs com <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton CA <br /> 6747 Sierra Court,Ste I Project Number C-Sparge Test Rep1rted <br /> Dublin CA,94568 Project Manager Paul LeCheminant 05/30/01 16 33 <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 1050329-EPA 5030B(P/T) <br /> Blank(1050329-BLKI) Prepared&Analyzed 05/24/01 <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-Trri luorololuene 868 100 868 60-140 <br /> LCS(1050329-BSI) Prepared&Analyzed 05/24/01 <br /> Benzene 8 85 0 500 ug/I 100 885 70-130 <br /> Qjene 951 0 500 l00 951 70-130 <br /> lbenzene 9 85 0 500 100 98 5 70-130 <br /> Xylenes(total) 30 1 0 500 300 100 70-130 <br /> Methyl tent-butyl ether 772 250 100 772 70-t30 <br /> Surrogate a a a-Tr]?uorotoluene 861 100 861 60-140 <br /> Matrix Spike(1050329-MS1) Source 5105291-02 Prepared&Analyzed 05/24/01 <br /> Benzene 859 0 500 ug/l too ND 859 60-140 <br /> Toluene 9 50 0 500 too ND 95 0 60-140 <br /> Ethylbenzene 959 0 500 100 ND 95 9 60-140 <br /> Xylenes(total) 294 0 500 300 ND 980 60-140 <br /> Methyl cert-butyl ether 103 250 100 ND 103 60-140 <br /> Surrogate a a a-Trifluorotoluene 828 100 82 8 60-140 <br /> Matrix Spike Dup(1050329-MSD1) Source 5105291-02 Prepared&Analyzed 05/24/01 <br /> Benzene 8 74 0 500 ug/l 100 ND 874 60-140 l 73 25 <br /> Toluene 9 66 0 500 100 ND 966 60-t40 1 67 25 <br /> Ethylbenzene 9 72 0 500 100 ND 972 60-140 135 25 <br /> Xylenes(total) 289 0 500 300 ND 963 60-140 172 25 <br /> Methyl tert-butyl ether 106 250 100 ND 106 60-140 2 87 25 <br /> Surrogate a a a-Triuorotoluene 830 100 83 0 60-140 <br /> equoia 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 4 of 6 <br />