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Sequoia 1551arlosCIndustrial Road <br /> San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX <br /> www <br /> 0)232 9612 <br /> www equoialabs com <br /> er-Ryan/Geostrategies(l) Project Tosco(l) <br /> 7 Sierra Court,Suite j Project Number Tosco 115886,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 12/06/01 16 51 <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 1110082-EPA 5030B JP/Tl <br /> Blank(1110082-BLK1) Prepared&Analyzed 11/21/01 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND I0 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND to " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl ten-butyl ether ND to " <br /> Tert-amyl methyl ether ND To " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1,1-Dichloroethane-d4 510 500 102 70-130 <br /> Surrogate Toluene-d8 512 500 104 70-130 <br /> LCS(1110082-BSI) Prepared&Analyzed 11/21/01 <br /> Methyl tert-butyl ether 560 1 0 ug/l Soo 112 70-130 <br /> ate 12-Dichloroethone-d4 574 500 MS 70-130 <br /> Surrogate Toluene-d8 526 500 105 70-130 <br /> _Matrix Spike(1110082-MSI) Source Ll 11130-03 Prepared&Analyzed 11/21/0I <br /> Methyl Cert-butyl ether 603 10 ug/t 500 20 806 60-140 <br /> Surrogate 1,2-Dichloroethane-0 564 500 113 70-130 <br /> Surrogate Toluene-d8 519 500 104 70-130 <br /> _Matrix Spike Dup(I 110082-MSDI) Source L111130-03 Prepared&Analyzed 11121/01_ <br /> Methyl tert-butyl ether 573 1 0 ug/l 500 20 746 60-140 773 25 <br /> Surrogate 1,2-Dschloroethane-d4 .535 500 111 70-730 <br /> Surrogate Toluene-d8 523 500 105 70-130 <br /> Batch 1110089-EPA 5030B <br /> Blank(1310089-BLK1) Prepared&Analyzed 11/26/01 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl teri-butyl ether ND 10 " <br /> Tert-anlyl methyl ether ND 1 0 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1 2-Dichloroethane-d4 496 500 992 70-130 <br /> is Analytical -San CarloS The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 18 of 23 <br />