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819 Stinker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical www <br /> (916) 00 <br /> sequaialabs alabs c tom <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton,CA <br /> 6747 Sierra Court, Ste I Project Number C-Sparge Test Reported <br /> Dublin CA,94568 Project Manager Paul LeCheminant 05/01/01 15 19 <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 Limas RPD Limit Notes <br /> Batch 1:040329- EPA 5030B(PIT) <br /> Blank(1040329-BLKI) Prepared&Analyzed 04/26/01 <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 2 50 " <br /> Surrogate a a a-Triuorotoluene 105 100 105 60-140 <br /> LCS(1040329-BSI) Prepared&Analyzed 04/26/01 <br /> Benzene 948 0 500 ug/l 100 948 70-130 <br /> WIb'nzcnene 960 0500 100 960 70-130 974 0 500 100 974 70-130 <br /> Xylenes(total) 298 0 500 300 993 70-130 <br /> Methyl tert-butyl ether 848 250 100 848 70-130 <br /> Surrogate a a a-Triuorotoluene 105 100 105 60-140 <br /> Matrix Spike(1040329-MSI) Source 5104353-02 Prepared&Analyzed 04/26/01 <br /> Benzene 973 0 500 ug/l 100 ND 973 60-140 <br /> Toluene 977 0 500 100 ND 977 60-140 <br /> Ethylbenzene 994 0 500 100 ND 994 60-140 <br /> Xylenes(total) 304 0 500 300 ND 101 60-140 <br /> Methyl tert-butyl ether 10 2 2 50 t 0 0 ND 102 60-140 <br /> Surrogate a a a-Triuorotoluene 10 7 100 107 60-140 <br /> Matrix Spike Dup(1040329-MSDI) Source 5104353-02 Prepared&Analyzed 04/26/01 <br /> Benzene 971 0 500 ug/l 100 ND 97 1 60-140 0206 25 <br /> Toluene 9 81 0 500 100 ND 98 1 60-140 0 409 25 <br /> Ethylbenzene 994 0 500 100 ND 994 60-140 0 25 <br /> Xylenes(total) 304 0 500 300 ND 101 60-140 0 25 <br /> Methyl tett-butyl ether 10 3 250 100 ND 103 60-140 0 976 25 <br /> Surrogate aaa-Tr fluorotoluene 10 7 100 107 60-140 <br /> --Sequoia Analytical- Sacramento The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must he reproduced in its entirety <br /> page 5 of 7 <br />