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J <br /> Road <br /> Sequoia an Carlos CAIndustrial 4070 <br /> San Carlos CA 94070 <br /> FAX 4D (650)232 9(650)232 966012 <br /> VQW Analytical wwwsequoialabsaom <br /> er-Ryan/Geostrategies(1) Project Tosco(l) <br /> Sierra Court, Suite 3 Project Number Tosco(Unocal)SS#6981 Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 09/27/01 10 19 <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 RPD Limit Notes <br /> Batch 1090075- EPA 5030B JP/T] <br /> LCS(1090075-BSI) Prepared&Analyzed 0912010) <br /> Methyl ter(-butyl ether 451 20 ugll 500 902 70-130 <br /> Surrogate 12-Dichloroethane-d4 473 500 946 76-114 <br /> Surrogate Toluene-d8 529 500 106 88-110 <br /> Matrix Spike (1090075-MSI) Source L109108-04 Prepared&Analyzed 09/20/01 <br /> Methyl tert-butyl ether 43 5 20 ug/l 500 ND 870 60-140 <br /> Surrogate 1,2-DtehIoroethane-d4 438 300 876 76-114 <br /> Surrogate Toluene-d8 479 500 958 88-110 <br /> Matrix Spike Dup(1090075-]11SD1) Source L109108-04 Prepared&Analyzed 09/20/01 <br /> Methyl tert-butyl ether 469 20 ug/l 500 ND 938 60-140 752 25 <br /> Surrogate 1,2-Dichloroethane-d4 437 500 874 76-114 <br /> Surrogate Toluene-d8 459 500 918 88-110 <br /> 1090076-EPA 5030B IP/T) <br /> Blank(1090076-BLK1) Prepared&Analyzed 09/20/01 <br /> Ethanol ND 1000 ug/l <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Ten-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dichloroethane-d4 490 500 980 76-114 <br /> Surrogate Toluene-d8 493 300 990 88-110 <br /> la Analytical- San Carlos The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 19 of 21 <br />