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Sequoia 819 Striker Avenue Suite S <br /> Sacramento CA 95834 <br /> 4 (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequotalabs com <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton,CA <br /> 6747 Sierra Court, Ste 7 Project Number C-Sparge Test Reported <br /> Dublin CA 94568 Project Manager Paul LeCheminant 06/25/01 14 29 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT -- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporpng Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Lcmits RPD Limit Notes <br /> Batch 1060183- EPA 50308 PIT <br /> Blank(1060183-BLKI) Prepared&Analyzed 06/20/01 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Surrogate a a a T'rifluorotoluene 100 100 100 60-140 <br /> LCS(1060183-BSI) Prepared&Analyzed 06/20/01 <br /> Benzene 832 050 ug/l 100 83 2 70-130 <br /> 40uene 933 050 100 93 3 70-130 <br /> ylbenzene 899 050 100 899 70-130 <br /> Xylenes(total) 28 7 050 300 95 7 70-130 <br /> Methyl tert-butyl ether 11 8 25 10 0 118 70-130 <br /> Surrogate a a a-Trifl uorotoluene 996 100 996 60-140 <br /> Matrix Spike(1060183-MSI) Source 5106302-03 Prepared&Analyzed 06/20/01 <br /> Benzene 797 0 50 ug/l 100 ND 79 7 60-140 <br /> Toluene 8 86 050 too ND 886 60-140 <br /> Ethylbenzene 863 050 100 ND 863 60-140 <br /> Xylenes(total) 27 7 0 50 300 ND 923 60-140 <br /> Methyl tert-butyl ether 11 7 2 5 10 0 ND 117 60-140 <br /> Surrogate a a a-Trac luorotoluene 105 100 105 60-140 <br /> Matrix Spike Dup(1060183-MSDI) Source 5106302-03 Prepared&Analyzed 06/20/01 <br /> Benzene 828 050 ug/l 10 0 ND 82 8 60-140 3 82 25 <br /> Toluene 924 050 t 0 0 ND 924 60-140 420 25 <br /> Ethylbenzene 902 050 100 ND 902 60-140 442 25 <br /> Xylenes(total) 290 050 300 ND 96 7 60-140 459 25 <br /> Methyl tert-butyl ether 11 7 2 5 10 0 ND 117 60-140 0 00 25 <br /> Surrogate a a a-Trtuorololuene 101 100 101 60-140 <br /> equota Analytical -Sacramento The results to this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 4 of 6 <br />