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819 Sinker Avenue Suite 8 <br /> Sacramento 95834 <br /> Sequoia (916)9)921-96449600 <br /> �t. Analytical www <br /> (916)921 4100 <br /> sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 8671,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/14/02 15 16 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> North Creek Analytical- Bothell <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1L24025-EPA 5030B ]MeOH] <br /> Blank(1L24025-BLKI) Prepared&Analyzed 12/24/01 <br /> Ethanol ND 0 005 mg/kg <br /> 1,2-Dibromoethane(EDB) ND 0 005 " <br /> 1,2-Dichloroethane(EDC) ND 0 005 " <br /> Dusopropyl ether ND 0 005 " <br /> Ethyl tert-butyl ether ND 0 005 " <br /> Methyl to t-butyl ether ND 0 005 " <br /> tert-Amyl Methyl Ether ND 0 005 " <br /> tert-Butyl Alcohol ND 050 " <br /> Surrogate 1 2-DCA-d4 31 40 78 57-139 <br /> Surrogate Toluene-d8 37 40 92 66-122 <br /> LCS(IL24025-BS1) Prepared&Analyzed 12/24/01 <br /> Dnsopropyl ether 075 0 005 mg/kg 1 0 75 70-130 <br /> ethyl tert-butyl ether 089 0 005 ;' 1 0 89 70-130 <br /> -Butyl Alcohol Alcohol 43 050 50 86 70-130 <br /> Surrogate 1 2-DCA-d4 30 40 75 57-139 <br /> Surrogate Toluene-d8 35 40 88 66-122 <br /> LCS Dup(1L24025-BSDi) Prepared&Analyzed 12/24/01 <br /> Dnsopropyl ether 077 0 005 mglkg 10 77 70-130 26 40 <br /> Methyl tert-butyl ether 093 0 005 10 93 70-130 44 40 <br /> tent Butyl Alcohol 41 050 50 82 70-130 48 40 <br /> I <br /> Surrogate 1 2-DCA-d4 30 40 75 57-139 <br /> Surrogate Toluene-d8 35 40 88 66-122 <br /> Matnx Spike(1L24025-MS1) Source 5112270-28 Prepared&Analyzed 12/24/01 <br /> Dnsopropyl ether 084 0 005 mg/kg 10 ND 84 60-140 <br /> Methyl tert-butyl ether 1 1 0 005 10 ND 110 60-140 <br /> tert-Butyl Alcohol 48 050 50 ND 96 60-140 <br /> Surrogate 1 2-DCA-d4 32 40 80 57-139 <br /> Surrogate Toluene-d8 36 40 90 66-122 <br /> .Sequoia Analytical-Sacramento 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 Page 24 of 27 <br />