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Sequoia 1551IodustnalRoad <br /> San Carlos GA 94070 <br /> Analytical (650)232-9600 <br /> FAX(650)232-9612 <br /> www sequoialabs corn <br /> ettler-Ryan/Geostrategies(1) Protect Unocal(4) <br /> 7 Sierra Court,Suite 7 Project Number Former Unocal#5098,Stockton Reported <br /> lin CA,94568 Project Manager Deanna Harding 07/01/02 07 46 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunit Units Level Result %REC Limits RPD Lunit Notes <br /> tch 2060028-EPA 5030B [P/TJ <br /> mk(2060028-BLKZ) Prepared&Analyzed 06/19/02 <br /> I12-Dibromoethaie ND 10 u0 <br /> Dichloroethane ND I0 " <br /> sopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 10 <br /> hyl tert-butyl ether ND 10 " <br /> -amyl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 20 „ <br /> vogate 1,2-Dtchloroethane-d4 531 Soo 106 70-130 <br />�Jffogate Toluene-d8 493 500 986 70-130 <br /> LCS(2060028-BSI) Prepared&Analyzed 06/18/02 <br /> yl tert-butyl ether 534 10 ug/l 500 107 70-130 <br />> ogale 1,2-Dichloroethane-d4 523 500 105 70-130 <br /> surrogate Toluene-d8 514 500 103 70-130 <br /> Jwh)60028-BS2) Pre erred&Analyzed 06/19/02 <br /> A"Itert-butyl ether 537 10 ug/1 500 107 70-130 <br /> fgate <br /> 1,2-Dichloroethane-d4 535 Soo 107 70-130 <br /> gate Toluene-& 510 300 102 70-130 <br /> 4atrix Spike(2060028-MSI) Source L206021-27 Prepared&Analyzed 06/18/02 <br /> yl tert-butyl ether 518 10 ugA 500 ND 104 60-140 <br /> gate 1 2-Dichloroethane-d4 506 500 101 70-130 <br /> urrogate Toluene-d8 516 Soo 103 70-130 <br /> Tffirix Spike Dap(2060028-MSD1) Source L206021-27 Prepared&Analyzed 06/18/02 <br /> I yl tert-butyl ether 50 1 1 0 ug/1 500 ND 100 60-140 3 92 25 <br /> arrogate 12-Dichloroelhane-d4 524 500 105 70-130 <br /> gate Toluene-d8 521 Soo 104 70-130 <br /> Bola 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 97 of 103 <br />