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1551 lndusinal Road <br /> San Carlos CA 94070 <br /> Sequoia (650)232-9600 <br /> j FAX <br />�W Analytical wwsug0ialabs om <br /> www sequaialabs com <br /> G Ryan/Geostrategies(1) Project Unoca](4) <br /> 6747 Sierra Court Suite] Project Number Former Unocal SS#12859 Stockton,CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 09/06/01 12 14 <br /> '%701atile Organic 8 07,3,genated Compounds by EPA Metbod 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> 4nalvie Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> latch 3080082 - EPA 5030B EP/T!_ - <br />,CS(1080082-BS2) Prepared&Analyzed 08/23/01 <br /> 4ethyl teri-butyl ether 44 1 20 ugll 500 882 70.130 <br /> urrogate 1 2-Dichloioeihane-d4 445 500 890 76-114 <br /> urrogaie Toluene-d8 473 500 946 88-110 <br /> ilatnx Spike(1080082-MSI) Source L108103-12 Prepared 08/19/01 Analyzed 08/23/01 <br />✓lethyl ten-butyl ether 45 6 20 ugll 500 ND 912 60-140 <br />,urrogate 1 2-Dichloroeihane-d4 449 500 898 76-114 <br />,urrogate Toluene-d8 468 SO 0 936 88-110 <br /> Matrix Spike Du (1080082-MSDI) Source L108103-12 Prepared 08/19/01 Analyzed 08/23/01 <br /> Aethyl tert-bury]ether 479 20 ugA 500 ND 958 60-140 492 25 <br /> surrogate 1 2-Dichloroethane-d4 45 7 500 914 76-114 <br /> iurro are Toluene-d8 45 7 500 914 88-110 <br /> 13a 0.0,01 EPA 5030B IP/TJ <br /> Blank (1080101-BLKI) Prepared&Analyzed 08/23/01 <br /> ahanol ND 1000 UO <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> I-tsopropyl ether ND 2 0 " <br /> Ethvl ten-butyl ether ND 20 " <br />'Methyl Leri-butyl ether ND 20 " <br /> Teri-amyl methyl ether ND 20 " <br /> Ten-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dichloroethane-d4 447 500 894 76-114 <br /> Surrogate Toluene-d8 478 500 956 88-110 <br /> Se a ArlalyilCal - San CSI los The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report niust be reproduced in its enurery <br /> Page 13 of 22 <br />