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` 1551 Industnal Road <br /> Sequoia San CatlosCA94070 <br /> 4D (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www sequo+alabs eam <br /> ler-Ryan/Geostrategies(1) Project Unoca](4) <br /> 7 Sierra Court,Suite J Project Number Former Unocal#2859,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 03/04/02 08 47 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEXIMTBE 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 Limit Notes <br /> Batch 2020063-EPA 5030BP( IT) <br /> Blank(2020063-BLK1) Prepared&Analyzed 02/20/02 <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 050 " <br /> Methyl tert-butyl ether ND 50 " <br /> Surrogate a a a-Tnfluorotoluene 960 100 960 70-130 <br /> LCS(2020063-BSI) Prepared&Analyzed 02/20/02 <br /> Benzene 871 050 ug/l 100 87 1 70-130 <br /> Toluene 867 050 too 867 70-130 <br /> Ethylbenzene 870 050 100 870 70-130 <br /> Xylenes(total) 263 050 300 877 70-130 <br /> Wee a a a-Trifluorotoluene 853 100 85 3 70-130 <br /> _LCS(2020063-BS2) Prepared&Analyzed 02/20/02 _ <br /> Purgeable Hydrocarbons as Gasoline 243 50 ug/l 250 972 70-130 <br /> Surrogate a a a-Triuorotoluene 901 100 901 70-130 <br /> Matrix Spike(2020063-MSI) Source L202088-05 Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline 244 50 ug/l 250 ND 976 60-140 <br /> Surrogate a a,a-Tri luoroioluene 985 " 100 985 70-130 <br /> Matnx S rke Du (2020063-MSDI) Source L202088-05 Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline 260 50 ug/I 250 ND 104 60-140 635 25 <br /> Surrogate a a a-Tr fluorotoluene 969 100 969 70-130 <br /> �ia 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 12 of 18 <br />