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q 1455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA 949544 <br /> iow Analytical (707)792-1365 <br /> FAX(707)792-0342 <br /> www sequoialabs corn <br /> er-Ryan/Geostratepies(1) Project Unoca](4) <br /> Sierra Court, Suite J Project Number Former Unocal 40187,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/24/02 16 38 <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 Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050026- EPA 5030B JP/TJ <br /> Matrix Spike Dup(2050026-MSDI) Source L205039-03 Prepared&Analyzed 05/13/02 <br /> Methyl ten-butyl ether 468 1 0 ug/1 Soo ND 936 60-140 238 25 <br /> Surrogate 1,1-Dichloroelhane-d4 475 500 950 70-130 <br /> Batch 2050028-EPA 5030B P/T <br /> Blank(2050028-BLKI) Prepared&Analyzed 05/14/02 <br /> Ethanol ND 500 ug/l <br /> Tert-butyl alcohol ND 20 " <br /> Methyl ten-butyl ether ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> Ethyl cert-butyl ether ND 10 " <br /> Teri-amyl methyl ether ND 10 " <br /> Surrogate 11-Dichloroethene-d4 493 500 986 70-130 <br /> LCS(2050028-BSI) Prepared&Analyzed 05/14/02 <br /> Methyl ter(-butyl ether 45 1 1 0 ug/l 500 902 70-130 <br /> Surrogate 1.2-Dichloroelhane-d4 490 11500 980 70-130 <br /> Matrix Spike(2050028-MSI) Source L205039-16 Prepared&Analyzed 05/14/02 <br /> Methyl tort-butyl ether 43 1 1 0 ug/l 500 ND 862 60-140 <br /> Surrogate 1 1-Dichloroeihane-&4 466 11500 932 70-130 <br /> Matrix Spike Dup(2050028-MSDI) Source L205039-I6 Prepared&Analyzed 05/14/02 <br /> Methyl tort-butyl ether 444 1 0 ug/l 500 ND 88 8 60-140 297 25 <br /> Surrogate 1,1-Dichloroethane-d4 494 500 988 70-130 <br /> la 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 27 of 30 <br />