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Sequoia404 N.Wiget Lane <br /> Walnut Creek,CA 94.598 <br /> (925)988-9600 <br /> l ,nal }`ical + FAX(925)98&9673 <br /> e <br /> } wwwsequoialabs.com <br /> filer Ryan,Inc.-Dublin <br /> Project: Chevron t <br /> D I Sierra Court Suite] Project Number: Chevron 4 9-3232 Reported: f <br /> ' Dublin CA,94568 Project Manager: Deanna L.Harding 03-Aug-0I 07:33 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> ,f <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1 G30017-EPA 5030B(P/'I') <br /> _Blank(IG30017-BLKI) <br /> Prepared&Analyzed:30-]u1-01 i <br /> Ethanof ND 500 ugll <br /> tert-Butyl alcohol ND 20 <br /> Methyl cert-butyl ether ND 2,0 } <br /> Di-isopropyl ether ND 2.0 ^ <br /> Ethyl tent-butyl ether ND 2.o ^ <br /> je <br /> tert-Amyl methyl ether ND 2.0 " <br /> i <br /> Surrogate:Dibromofluoromerhane 56.0 50.0 112 50-150 <br /> Surrogate:1,1-Dichloroethane-d4 51.6 50.0 103 50-I50 <br /> Blank(IG30017-BLK2) Prepared&Analyzed:31-Jul-01 <br /> Ethanol _ ND 500 ugfl <br /> tert-Butyl alcohol ND 20 " <br /> i Niethyl tert-butyl ether ND 2.0 " <br /> propyl ether ND 2.0 " <br /> tert-butyl ether ND 2,0 " <br /> tent-Amyl methyl ether ND 2.0 <br /> Y <br /> Surrogate:Dibromofluoromelhane 47.0 50.0 94.0 50-150 <br /> Surrogate:l,1-Dichloroethane-d4 48.0 50.0 96.0 50-150 <br /> Blank(1G30017-BLK3) Prepared&Analyzed:01-Aug-01 <br /> Ethanol ND 500 ugll 6 j <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 2.0 " <br /> Di-isopropyl ether ND 2.0 <br /> Ethyl tert-butyl ether ND 2.0 " t <br /> Cert-Amyl methyl ether ND 2.0 <br /> Surrogate:Dibromofluoromelhane 51.0 50.0 ' 102 50-150 <br /> Surrogate: 1,1-Dichloroethane-d4 49.7 50.0 a 99.4 50-150 <br /> Sequoia Analytical-Walnut Creek 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 /> ,p <br /> Page 8 of 10 <br />