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Sequoia 1455McDowell SlhSte <br /> �-•-_�",' Petalumauma C CA 949544 <br /> �� Analytical FAX(707)792-1865 <br /> (707)792-0342 <br /> www sequoialabs com <br /> Gettler-Ryan/Geostrategtes(1) Project Unocal(4) <br /> 6747 Sierra Court,Suite j Project Number Former Unocal#0187, Stockton Reported <br /> Dublin CA, 94568 Project Manager Deanna Harding 05/24/02 16 38 <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 Limit Notes <br /> Batch 2050040-EPA 5030B T/D - - <br /> Blank(2050040-BLKI) Prepared&Analyzed 05/18/02 <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 tent-butyl ether ND so " <br /> Surrogate a a a-Trifluoroioluene 836 100 83 6 70-130 <br /> LCS(2050040-SSI) Prepared&Analyzed 05/18/02 <br /> Benzene 980 050 ug/1 too 980 70-130 <br /> Toluene 925 050 JOG 925 70-130 <br /> Ethylbenzene 846 050 100 84 6 70-130 - <br /> Xylenes(total) 25 6 050 300 853 70-130 <br /> Surrogate a a a-Triuorotoluene 934 100 934 70-130 <br /> -LCS(2050040-BS2) Prepared&Analyzed-05/18/02 <br /> Purgeable Hydrocarbons as Gasoline 250 50 ug/l 250 100 70-130 <br /> Surrogate a a a-Trfluorotoluene __ __� —928 _ _ , __ _ _- _ 10 0 _ _92 8 _ _70-130 <br /> Matrix Spike(2050040-MSI) Source L205039-04 Prepared&Analyzed 05/18/02 <br /> Benzene 931 050 ug/I 100 ND 93 1 60-I40 <br /> Toluene 869 050 100 ND 869 60-140 <br /> Ethylbenzene 798 050 100 ND 798 60-140 <br /> Xylenes(total) 242 050 300 ND 807 60-140 <br /> Surrogate a a a-Triuorotoluene 95.5 100 955 70-130 <br /> Matrix Spike Dup(2050040-MSDI) Source L205039-04 Prepared&Analyzed 05/18/02 <br /> Benzene 103 0 50 US/] 100 ND 103 60-140 101 25 <br /> , <br /> Toluene 947 050 100 ND 947 60-140 8 59 25 <br /> .Ethylbenzene 877 050 JOG ND 877 60-140 9 43 25 <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance wuh the chafe <br /> custoa),document This analytical report must be reproduced in its entirety 4 <br /> Page 22 of 30 <br />