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Sequoia 819 Straker Avenue Suite <br /> Sacramento CA 958344 <br /> 4 4D (916)92I-9600 <br /> Ow Analytical FAX equa alabs92 1 c 00 <br /> www sequotalabs 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 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 Limits RPD Limit Notes <br /> Batch 1050007 - EPA 5030B(PIT) <br /> Blank(1050007-BLKI) Prepared&Analyzed 04130101 <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-Tri luorotoluene 102 100 102 60-140 <br /> LCS(1050007-BSI) Prepared&Analyzed 04/30/01 <br /> Benzene 100 0 500 ug/l too 100 70-130 <br /> 18ne 104 0 500 100 104 70430 <br /> benzene 105 0 500 10 0 t05 70-130 <br /> Xylenes(total) 31 5 0 500 300 105 70-130 <br /> Methyl tett-butyl ether 891 250 100 891 70-130 <br /> Surrogate a a a Tr fluorotoluene 102 100 102 60-140 <br /> Matrix Spike(1050007-MSI) Source 5104397-07 Prepared&Analyzed 04/30/01 <br /> Benzene 964 0 500 ug/l 100 ND 964 60-140 <br /> Toluene 974 0 500 too ND 974 60-140 <br /> Ethylbenzene 993 0 500 100 ND 993 60-140 <br /> Xylenes(total) 300 0 500 300 ND 100 60-140 <br /> Methyl tert-butyl ether 103 250 100 ND 103 60-140 <br /> Surrogate a a a-Trijluorotoluene 987 100 98 7 60-140 <br /> Matrix Spike Dup(1050007-MSDI) Source 5104397-07 Prepared&Analyzed 04/30/01 <br /> Benzene 984 0 500 ug/l too ND 98 4 60-140 2 05 25 <br /> Toluene too 0 500 10 0 ND 100 60-140 263 25 <br /> Ethylbenzene 104 0 500 10 0 ND t04 60-140 462 25 <br /> Xylenes(total) 310 0 500 300 ND 103 60-140 328 25 <br /> Methyl tert-butyl ether 926 250 100 ND 926 60-140 10 6 25 <br /> Surrogate a a a-Trifluororoluene 9 98 100 998 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 />