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Sequoia <br /> 819 Striker Avenue Suite 8 <br /> Sacramento e uoia nto )9 95834 <br /> S <br /> (916)921 9600 <br /> Analytical <br /> ex) FAX(916)921 0100 <br /> www 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 /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1L26009-EPA 5030B(MeOH) <br /> Blank(IL26009-BLK1) Prepared&Analyzed 12/26/01 <br /> Ethanol ND 25 mg/kg <br /> tert-Butyl alcohol ND 25 " <br /> Methyl teat-butyl ether(MTBE) ND 0 10 " <br /> Di isopropyl ether ND 0 10 " <br /> Ethyl tent-butyl ether ND 0 10 " <br /> 1,2-Dichloroethane ND 010 " <br /> teat-Amy]methyl ether ND 0 10 " <br /> 1,2-Dibromoethane ND 010 " <br /> Surrogate Dibromofluoromethane 2 68 2 50 107 50-150 <br /> Surrogate 12-Dichloroethane-d4 3 15 2 50 126 50-150 <br /> LCS(1L26009-BSI) Prepared&Analyzed 12/26/01 <br /> Methyl tert-butyl ether(MTBE) 229 0 10 mg/kg 250 92 70-130 <br /> arrogate Dibromofluoromethane 2 71 012 50 108 50-150 <br /> Surrogate 12-Dichloroethane-d4 307 250 123 50-150 <br /> Matrix Spike(I L26009-MSI) Source W112393-01 Prepared&Analyzed 12/26/01 <br /> Methyl tert-butyl ether(MTBE) 278 0 10 mg/kg 2 50 ND 111 60-140 <br /> Surrogate Dibromofluoromethane 260 250 104 50-150 <br /> Surrogate 12-Dichloroethane-d4 305 250 122 50-150 <br /> Matnx Spike Dup(IL26009-MSD1) Source WI 12393-01 Prepared&Analyzed 12/26/01 <br /> Methyl tert-butyl ether(MTBE) 2 83 0 10 mg/kg 250 ND 113 60-140 2 25 <br /> Surrogate Dibromofluoromethane 2 69 250 108 50-150 <br /> Surrogate 12-Dichloroethane-d4 306 250 122 50-150 <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 26 of 27 <br />