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n, • <br /> 819 Sinker Avehue Suite 8 <br /> Saento CA5834 <br /> Sequoia �arn(916)92199600 <br /> FAX(916)921-0100 <br /> Analytical www seNuolalabs corn <br /> SECOR International-Rancho Cordova Project Chevron 9-6171, Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 077 43512 251 Reported <br /> Rancho Cordova CA,95670 Project Manager Bill Brasher 07/12/01 18 32 <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 1F28008-EPA 5030B(MeOH) <br /> Blank(IF28008-BLK2) Prepared&Analyzed 0612810) <br /> Ethanol ND 25 mg/kg <br /> Cert-Butyl alcohol ND 25 " <br /> Methyl tert-butyl ether ND 020 " <br /> Di-isopropyl ether ND 0 10 " <br /> Ethyl tert-bury{ether ND 0 10 <br /> tert-Amyl methyl ether ND 0 l0 " <br /> Surrogate Dtbromofluoromethane 213 _ 250 85 2 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 248 250 992 50-150 <br /> LCS(IF28008-BS2) Prepared&Analyzed 06/28/01 <br /> Methyl tert-butyl ether 242 020 mg/kg 250 968 70-130 <br /> Nate Dibromofluoromethane 228 250 912 50-150 <br /> ale 1 2-Dichloroethane-d4 256 250 102 50-150 <br /> Matrix Spike(1F28008-MSI) Source W106496-01 Prepared 06/27/01 Analyzed 06/28/01 <br /> Methyl tert-butyl ether 277 020 mg/kg 250 ND 111 60-140 <br /> Surrogate Dibromofluoromethane 241 250 964 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 2 77 250 111 50-150 <br /> Matrix Spike Du (IF28008-MSD1) Source W106496-01 Prepared 06/27/01 Analyzed 06/28/01 <br /> Methyl tert-butyl ether 3 12 020 mg/kg 250 ND 125 60-140 119 25 <br /> Surrogate Dibromofluoromethane 234 250 936 50-150 <br /> Surrogate 12-Dichloroethane-d4 260 250 104 50-150 <br /> oia Analytical-Sacramento The results in this report apply 10 the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 12 of 13 <br />