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Gcttler-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number: Tosco#11 195,Lathrop,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 05/25/01 14:01 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- San Carlos <br /> Reporting Spike Source O/uREC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1050074-EPA 5030B [PIT] <br /> LCS(1050074-BS2) Prepared&Analyzed:05/18/01 <br /> Methyl tert-butyl ether 45.2 2.00 ug/I 50.0 90.4 70-130 <br /> Surrogate:l,2-Dichloroethane-d4 47.0 50.0 94.0 76-114 <br /> Surrogate:Toluene-0 50.6 50.0 101 88-110 <br /> Matrix Spike(1050074-MS1) Source:L105074-12 Prepared&Analyzed: 05/17/01 <br /> Methyl tert-butyl ether 46.4 2.00 ug/l 50.0 ND 92.8 60-140 <br /> Surrogate:l,2-Dichloroethane-d4 48.0 50.0 96.0 76-114 <br /> Surrogate:Toluene-d8 52.3 50.0 105 88-110 <br /> Matrix Spike Dup(1050074-MSDI) Source:L105074-12 Prepared&Analyzed:05/17/01 <br /> Methyl tert-butyl ether 45.8 2.00 ugll 50.0 ND 91.6 60-140 1.30 25 <br /> Surrogate:1,2-Dichloroethane-d4 48.4 50.0 96.8 76-114 <br /> Surrogate:Toluene-d8 51.2 50.0 101 88-110 <br /> Batch 1050076-EPA 5030B PIT <br /> Blank(1050076-BLKI) Prepared&Analyzed:05/17/01 <br /> Ethanol ND 1000 ugli <br /> 1,2-Dibromoethane ND 2.00 " <br /> 1,2-Dichloroethane ND 2.00 " <br /> Di-isopropyl ether ND 2.00 " <br /> Ethyl tert-butyl ether ND 2.00 " <br /> Methyl tett-butyl ether ND 2.00 " <br /> Tert-amyl methyl ether ND 2.00 <br /> I <br /> Ted-butyl alcohol ND 100 " <br /> Surrogate:l,2-Dichloroethane-d4 41.1 50.0 82.2 76-114 <br /> Surrogate:Toluene-d8 51.9 50.0 104 88-110 <br /> Sequoia Analytical-San CarlosP PPY P analyzed The results in this report apply to the samples anal ed in accordance with the cht� <br /> custody document.This analytical report must be reproduced in its entirety. <br /> i <br /> I <br /> Page 16 of 20 <br />