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QSequoia <br />� Analytical <br />404 N Wiget Lane <br />Walnut Creels CA 94598 <br />{925} 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />I <br />Gettler Rydn hic - Dublin Protect Chevron <br />6747 Sierra Court Suite J Project Number Chevron 11 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 01 -Jun -00 1105 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />knalvte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE30023 - EPA 50308 (PIT] <br />510 <br />Soo 104 50.150 <br />Swrogate 12 Dkhloroethmm-d4 <br />Blank (OE30023-BLKI) <br />500 112 SO -150 <br />LCS (OE30023-M) <br />Prepared & Analvzed 28 -May -00 <br />tert-Butyl alcohol <br />ND <br />100 <br />ug1l <br />Methyl ten butvl ether <br />ND <br />20 <br />Surrogate 1 2-DwWoroethane-d4 <br />Di -isopropyl ether <br />ND <br />20 <br />" <br />Ethyl tert-butyl ether <br />ND <br />20 <br />" <br />ten -Amyl methyl ether <br />ND <br />20 <br />Surrogate 12-Dichloroethane-d4 <br />Surrogate DibromoJluoromethane <br />540 <br />500 108 50-150 <br />Surrogate 1 2-Dichloroerhane-d4 <br />580 <br />500 116 50-150 <br />Blank (OE30023-BLK2) <br />Prepared & Analyzed 30 -May -00 <br />tent -Butyl alcohol <br />ND <br />100 <br />ug/1 <br />Methyl tett-butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />Ethyl tert butyl ether <br />ND <br />20 <br />tent -Amyl methyl ether <br />ND <br />20 <br />" <br />Surrogate DibronroJluoromethane <br />550 <br />SO 0 110 50.150 <br />Surrogate 11-Drchloroethane-d4 <br />600 <br />Soo 120 50-150 <br />LCS (0E30023-BS0 <br />Prepared & Analyzed 28 -May -00 <br />Mcthyl tori-bwyl etl1w <br />525 <br />20 <br />ug/I 500 1105 70-130 <br />Surrogate Dibr nsafluoromethane <br />510 <br />Soo 104 50.150 <br />Swrogate 12 Dkhloroethmm-d4 <br />56.0 <br />500 112 SO -150 <br />LCS (OE30023-M) <br />Prepared & Analyzed 30 -May -W <br />Methyl Cert -butyl ether <br />550 20 ug/l <br />500 )to 70-130 <br />Surrogate Dtbromof luoromethmre <br />580 <br />SO 0 116 50-150 <br />Surrogate 1 2-DwWoroethane-d4 <br />600 <br />500 110 50-150 <br />Matrix Spike (OE30023-MSI) <br />Source W005627-01 <br />Prepared 28 -May -00 Analyzed 29 -May -00 <br />Methvl tert-butvl ether <br />296 20 ugll <br />500 220 152 60-150 Q-01 <br />Surrogate Dibromofluoromerhane <br />570 <br />500 114 50-150 <br />Surrogate 12-Dichloroethane-d4 <br />610 <br />500 122 50-150 <br />uola Analytical - Walnut Creels <br />The results m this repori apply to the samples analyzed to accordance with rhe sham <br />custody documeni This analytical report must be reproduced in its entire <br />Page 5 of 7 <br />