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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> (9 16)922 1-9600 <br /> FAX(9 16)921-0100 <br /> Analytical www sequoialabs com <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton,CA <br /> Reported <br /> 6747 Sierra Court,Ste J Project Number C-Sparge Test <br /> Dublin CA,94568 Project Manager P LeCherrunant 02/07/01 14 38 <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 /> Po g <br /> IAnalytc Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1020066-EPA 5030B McOH <br /> Blank(1020066-BLKI) Prepared&Analyzed 02/06/01 <br /> Purgeable Hydrocarbons NO 50 0 ug/l <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene NO 0 500 <br /> Xylenes(total) NO 0 500 <br /> Methyl tert-butyl ether NO 2 50 — <br /> Surrogate a a a-Trifluorotoluene <br /> 11 0 10 0 110 d0-140 <br /> LCS(1020066-BS1) Prepared&Analyzed 02/06/01 <br /> Benzene 951 0 500 ug/l too 95 t 70-130 <br /> ene <br /> 955 0 500 100 955 70-130 <br /> Ibenzene 955 0 500 too 955 70-130 <br /> Xylenes(total) 293 0 500 300 977 70-130 <br /> Methyl tett-butyl ether <br /> 104 250 100 104 70-130 <br /> Surrogate a a a-Trifluorotoluene <br /> ��-�- IO b 100 106 60-140 <br /> Matrix Spike(1020066-MSI) Source S102048-02 Prepared&Analyzed 02/06/01 <br /> Benzene <br /> 947 0 500 ug,11 too NO 947 60-140 <br /> Toluene 974 0 500 100 ND 974 60-140 <br /> Ethylbenzene 978 0 500 10 0 ND 978 60-140 <br /> Xylenes(total) 30 1 0 500 300 NO 100 60-140 <br /> Methyl tent-butyl ether 978 2 50 too NO 97 8 60-140 <br /> Surrogate n a a-Trifluorotoluene <br /> 110 100 110 60-140 <br /> Matrix Spike Dup(1020066-MSDI) Source S102048-02 Prepared&Analyzed 02/06/01 <br /> Benzene 960 0 500 ug/l 100 NO 960 60-140 1 36 25 <br /> Toluene 9 89 0 500 100 NO 98 9 60-140 1 53 25 <br /> Ethylbenzene 989 0 500 100 NO 999 60-140 1 12 25 <br /> (total) <br /> 305 0 500 30 0 ND 102 60-140 1 32 25 <br /> Xylenes( 8 99 250 100 NO 899 60-140 842 25 <br /> Methyl tetotal) ether <br /> Surrogate a a a-Trifluorotoluene <br /> 109 100 109 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 6 of 7 <br />