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Sequoia 1551Industrial Road <br /> u01a S <br /> an Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical <br /> FAX(650)232-9612 <br /> www sequoialabs com <br /> ttler-Ryan/Geastrategics(1) Project Unocal(4) <br /> Stena Court, Suite j Project Number Former Unocal 42859,Stockton Reported <br /> ubl in CA,94568 Project Manager Deanna Harding 05/30/02 14 17 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunt Notes <br /> Batch 2050057-EPA 5030B(P/T) <br /> LCS(2050057-BS3) Prepared&Analyzed 05/24/02 <br /> Benzene 9 88 050 ug/l 100 98 8 70-130 <br /> Toluene 923 050 100 923 70-130 <br /> Ethylbenzene 886 0 50 100 896 70-130 <br /> Xylenes(total) 264 050 300 880 70-130 <br /> Surrogate a a,a-Triuorotoluene 963 100 963 70-130 <br /> LCS(2050057-BS4) Prepared&.Analyzed 05/24/02 <br /> Purgeable Hydrocarbons as Gasoline 233 50 u8/1 250 932 70-130 <br /> Surrogate a,a,a-Trifluorotoluene 852 " 100 852 70-130 <br /> Matrix Spike(2050057-MSI) Source L205055-07 Prepared 05/23/02 Analyzed 05/24/02 <br /> Purgeable Hydrocarbons as Gasoline 239 50 ug/l 250 ND 956 60-140 <br /> Surrogate a a a-Trifluorotoluene 9 77 " 100 977 70-130 <br /> x Spike Dup(2050057-MSDI) Source L205055-07 Prepared 05/23/02 Analyzed 05/24/02 <br /> ble Hydrocarbons as Gasoline 251 50 ug/l 250 ND 100 60-140 490 25 <br /> Surrogate aaa-Triuorotoluene 960 100 960 70-130 <br /> Batch 2050059-EPA 5030B(P/T) <br /> Blank(2050059-BLKI) Prepared&Analyzed 05/24/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 0 i0 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 50 " <br /> Surrogate a a a-Trruorololuene 101 100 101 70-130 <br /> Sala Analytical -San Carlos The results in 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 16 of 20 <br />