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819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921-0 100 <br /> 0IWO Analytical www sequoialabs corn <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 LeChemtnant 02/07/01 14 38 <br /> Total Purgeable Hydrocarbons (C6-Ci2), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %ITEC RPD <br /> Analyte Result Limit Units Tavel Result %REC Limits RPD Limit dotes <br /> Batch 1020046-EPA 5030B McOH) <br /> Blank(1020046-BLKl) Prepared&Analyzed 02/05/01 <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 tent-butyl ether ND 250 <br /> Surrogate a a a-Trifluorotoluene 909 100 909 60-140 <br /> LCS(1020046-BSI) Prepared&Analyzed 02/05/01 <br /> Benzene 926 0 500 ug/l 100 92 6 70-130 <br /> I <br /> 49ene 924 0 500 100 92 4 70-130 <br /> )benzene 928 0 500 100 928 70-130 <br /> Xylenes(total) 277 0 500 300 923 70-130 <br /> Methyl tert-butyl ether 885 250 100 885 70-130 <br /> Surrogate a a a-Trifluorololuene 930 100 930 60-140 <br /> Matrix Spike(1020046-MSS) Source 5101454-09 Prepared&Analyzed 02/05/01 <br /> Benzene 762 0 500 ug/l too NO 762 60-140 <br /> Toluene 781 0 500 100 ND 78 1 60-140 <br /> Ethylbenzene 772 0 500 100 ND 77 2 60-140 <br /> Xylenes(total) 23 3 0 500 300 ND 777 60-140 <br /> Methyl tert-butyl ether 736 2 50 10 0 ND 73 6 60-140 <br /> Surrogate a a a-Trifluorololuene 691 100 691 60-140 <br /> Matrix Spike Dup(1020046-MSDI) Source 5101454-09 Prepared&Analyzed 02/05/01 <br /> Benzene 8 38 0 500 ug/i 10 0 ND 83 8 60-140 950 25 <br /> Toluene 858 0 500 100 ND 85 8 60-140 940 25 <br /> Ethylbenzene 855 0 500 too ND 85 5 60-140 102 25 <br /> Xylenes(total) 256 0 500 300 ND 85 3 60-140 941 25 <br /> Methyl tert-butyl ether 793 250 10 0 ND 793 60-140 746 25 <br /> Surrogate a a a-Trtfluorotoluene 819 100 819 60-140 <br /> equota 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 5 of 7 <br />