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Indu <br /> 1551 Carlos, <br /> A 4070 <br /> Road <br /> Sequoia Saa Carlos,CA 94070 <br /> (650)232-9600 <br /> �W Analytical FAX(650)232-9612 <br /> www sequoialabs corn <br /> ler-Ryan/Geostrategies(l) Project Unocal(4) L208033 <br /> 7 Sierra Court, Suite] Project Number Former Unocal 40187,Stockton Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 08/29/02 07 10 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEXM by EPA 8021B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 21421004-EPA 5030B PIT <br /> Matrix Spike Dup(2H21004-MSDI) Source L208033-31 Prepared&Analyzed 08/21/02 <br /> Xylenes(total) 471 050 119/1 461 071 101 60-140 912 25 <br /> Surrogate aaa-Triuorotoluene 186 100 186 70-130 QM-07 <br /> Batch 2H22002- EPA 5030B[P/TJ <br /> Blank(2)i22002-BLKI) Prepared&Analyzed 08/22/02 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 + <br /> Xylenes(total) ND 050 I <br /> I <br /> tert-butyl ether ND 2 5 " <br /> Surrogate a a a-Trifluorotoluene 913 - 100 923 70-130 �- <br /> Laboratory Control Sample(21422002-BSI) Prepared&Analyzed 08/22/02 <br /> Benzene 103 050 ug/l 100 103 70-130 <br /> Toluene 103 050 100 103 70-130 <br /> Ethylbenzene 9 92 050 100 992 70-130 <br /> Xylenes(total) 306 050 300 102 70-130 <br /> Surrogate aaa-Triuorotoluene 107 100 107 70-130 <br /> Laboratory Control SaMle(2H22002-BS2) Prepared&Analyzed 08/22/02 <br /> Gasoline Range Organics(C6-C10) 266 50 ug/I 250 106 76-130 <br /> Surrogate aaa-Triuorotoluene 113 11100 123 70-130 <br /> Matrix Spike(21122002-MSI) Source MLH0346-01 Prepared&Analyzed 08/22/02 <br /> Gasoline Range Organics(C6-C10) 477 50 u8A 550 - ND 867 60-140 <br /> Benzene 309 0 50 6 60 ND 164 60-140 QM-07 <br /> Toluene 395 0 50 397 ND 995 60-140 <br /> Ethylbenzene 948 050 920 ND 103 60-140 <br /> Xylenes(total) 461 0 50 461 ND 100 60-140 <br /> la Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 32 of 36 <br />