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1551 lndusinal Road <br /> Sequoia San C rlos CA 94070 <br /> a_ _� (650)Analytical FAX 232-9600 <br /> (650)232-9612 <br /> www sequoialabs com <br /> ler-Ryan/Geostrategies(1) Project Unocal(4) <br /> Sierra Court, Suite J Project Number Former Unocal#2859,Stockton Reported <br /> Dublin 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 0/,,REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050056-EPA 5030B SPIT) <br /> Blank(2050056-BLKI) Prepared&Analyzed 05/23/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug(l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 50 " <br /> Surrogate a a a-Trifluorotoluene 943 100 943 70-130 <br /> LCS(2050056-BS1) Prepared&Analyzed 05/23/02 <br /> Benzene 915 050 ug/1 10 0 915 70-130 <br /> Toluene 880 050 10 0 880 70-130 <br /> Ethylbenzene 820 050 100 820 70-I30 <br /> Xylenes(total) 248 050 300 82 7 70-130 <br /> ate a a a-Triuorotoluene 10 6 100 106 70-130 <br /> LCS(2050056-BS2) Prepared&Analyzed 05/23/02 <br /> Purgeable Hydrocarbons as Gasoline 260 50 ugll 250 104 70-130 <br /> Surrogate a,a,a-Tr fluorotoluene 101 " 100 101 70-130 <br /> Matrix Spike(2050056-MSI) Source L205052-06 Prepared&Analyzed 05/23/02 _ <br /> Purgeable Hydrocarbons as Gasoline 294 50 ug/l 250 ND 118 60-140 <br /> Surrogate a a a-Trifluorotoluene 888 1110 0 888 70-130 <br /> Matrix Spike Dup(20501156-MSDI) _ Source L205052-06 Prepared&Analyzed 05/23/02 <br /> Purgeable Hydrocarbons as Gasoline 294 50 ug/I 250 ND 118 60-140 000 25 <br /> Surrogate a,a,a-Tr ftuorotoluene 983 100 983 70-130 <br /> is Analytical- San Carlos 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 14 of 20 <br />