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_Sequoia 819 Sinker Avenue,Suite 8 - <br /> _ Sacramento,CA 95634 <br /> T9_16_)_92_1_9600 <br /> Analytical www sequoialabs cam <br /> Iw <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Pmjeet Manager Rusty Benkosky 07/09/02 16 26 <br /> __7 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2060375-EPA 5030B [P/TJ <br /> Blank 2060375-BLKI Prepared&Analyzed 06/27/02 <br /> Ethanol ND 020 mg/kg <br /> Tert-butyl alcohol ND 0 050 <br /> Methyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 0 0050 " <br /> Tert-amyl methyl ether ND 00050 " <br /> 1,2-Dichloroethane ND 0 0050 " <br /> 1,2-Dibromoethane(EDB) ND 0 0050 " <br /> Benzene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Toluene ND 0 0050 " <br /> Xylenes(total) ND 0 0050 " <br /> Gasoline(C6-C10) ND 1 0 <br /> Surrogate 1 2-DCA-d4 00494 00500 99 60-140 <br /> Surrogate Toluene-d8 00546 00500 109 60-140 <br /> Surrogate 4-BFB 00574 00500 115 60-140 <br /> LCS(2060375-BS1) Prepared&Analyzed 06/27/02 _ <br /> Methyl tert-butyl ether 00423 0 0050 mg/kg 00436 97 60-140 <br /> Benzene 0 0268 0 0050 0 0268 100 70-130 <br /> Toluene 0 160 0 0050 0 162 99 70-130 <br /> Gasoline(C6-CIO) 1 91 1 0 2 20 87 70-130 <br /> Surrogate 12-DCA-d4 00512 00500 102 60-140 <br /> Surrogate Toluene-d8 00524 00500 105 60-140 <br /> Surrogate 4-BFB 00519 00500 104 60-140 <br /> Matrix Spike(2060375-MSI) Source 5206360-02 Prepared&Analyzed 06/27/02 <br /> Methyl tert-butyl ether 00404 00050 mg/kg 00436 ND 93 60-140 <br /> Benzene 00262 00050 0 0268 ND 98 60-140 <br /> Toluene 0 157 0 0050 0 162 ND 96 60-140 <br /> Gasoline(C6-CIO) 1 86 l 0 220 ND 85 60-140 <br /> Surrogate 1 2-DCA-d4 00506 00500 101 60-140 <br /> Surrogate Toluene-d8 00525 00500 105 60-140 <br /> Surrogate 4-BF8 00548 00500 110 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 4 of 6 <br />