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Sequoia 1551arlosC Industrial Road <br /> San Carlos CA 94070 <br /> (650)232 9600 T <br /> '4FAX 232 9612!'✓ <br /> W Analytical r. <br /> www sequoiquoialabs coni <br /> Gen ler-Ryan/G eostrategies(I) Project Unocal(4) , <br /> 6747 Sierra Court, Suite 3 Protect Number Former Unocal SS42859 Stockton CA Reported <br /> Dublin CA 94568 Protect Manager Deanna Harding 09/06/01 12 14 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RAD Limit Notes <br /> Batch 1080101 - EPA 5030113 JP/Tl <br /> Blank(2080101-BLK2) Prepared&Analyzed 08/24/01 <br /> Ethanol ND 1000 ug/1 <br /> 2-Dibromoethane ND 2 0 " <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Teri-amyl methyl etber ND 2 0 " <br /> Teri-butyl alcohol ND 100 " <br /> t Surrogate 1 2-Drchloroethane-d4 429 500 858 76-114 W <br /> Surrogate Toluene-d8 468 500 936 88-110 <br /> LCS(1080101-BSI) Prepared&Analyzed 08/23/01 <br /> Methyl tert-bury]ether 44 1 2 0 ug/I 500 88 2 70-130 <br /> Surrogate 12-Dichloroethane-d4 445 .500 890 76-114 <br /> Surrogate Toluene-d8 473 300 946 88-110 <br /> LCS(1080101-BS2) Prepared&Analyzed 08/24/01 <br /> Methyl teri-butyl ether 44 6 2 0 ug/I 500 892 70-130 <br /> Surrogate 12 Dichloroeihane-d4 442 50 0 884 76-114 <br /> Surrogate-Toluene-d8 r= �_ 464 - 500 _ _ 92 888.110 <br /> Matrix Spike(1080101-NISI) Source L108144-04 Prepared&Analyzed 08/24/01 <br /> T Methyl teri-butyl ether 45 7 2 0 ugfl T 500 ND 9I 4 60-140 T <br /> Surrogate 1 2-Drchloroethane-d4 45 7 500 91 4 76-114 <br /> Surrogate Toluene-d8 464 Soo 928 88-110 <br /> Matrix Spike Dup(1080101-MSDI) Source L108144-04 Prepared&Analyzed 08/24/01 <br /> Methyl tent-butyl ether 45 1 2 0 ug/l 500 ND 90 2 60-140 132 25 <br /> Surrogate 1 2-Dichloroethane-d4 448 500 896 76-114 <br /> Surrogate Toluene-d8 460 500 920 88-110 <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain o <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 14 of 22 <br />