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4 t 5:� <br />Sequoia <br />wo Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron t! 9-5775 <br />Dublin CA, 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N WlgetLane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequotalabs com <br />Reported <br />19 -Apr -00 11 41 <br />Reporting Spike Source %REC RPD <br />analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 111313012 - EPA 5030B [PIT] <br />Blank (OD13012-BLKI) <br />ND <br />100 ug/t <br />Prepared &Analyzed 12 -Apr -00 <br />ter% -Butyl alcohol <br />ND <br />100 <br />ug/l <br />Methyl ter% butyl ether <br />ND <br />20 <br />20 <br />Di isopropyl ether <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />Ethyl Cert butyl ether <br />ND <br />20 <br />" <br />tett-Amyl methyl ether <br />ND <br />20 <br />" <br />Surrogate Dibromofluoromethane <br />520 <br />100 ug/l <br />500 104 50-150 <br />Surrogate 1 2-Dichloroelhane-d4 <br />520 <br />Di -isopropyl ether <br />500 104 50-150 <br />Blank (OD13012-BLK2) <br />Ethyl tert-butyl ether <br />ND <br />Prepared & Analyzed 14 -Apr -00 <br />tert-Butyl alcohol <br />ND <br />100 ug/t <br />Methyl tert-butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />thyl tett-butyl ether <br />ND <br />20 <br />rt Amyl methyl ether <br />We <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />530 <br />" <br />Surrogate I 1-Dichloroethane-d4 <br />490 <br />" <br />Blank (OD13012-BLK3) <br />tert-Butyl alcohol <br />ND <br />100 ug/l <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 />tett-Amyl methyl ether <br />ND <br />20 " <br />Surrogate DrbromoJluoromethmie <br />520 <br />" <br />Surrogate 12-Dichloroethane-d4 <br />550 <br />" <br />LCS (OD13012-BSI) <br />Methyl tent -butyl ether <br />540 <br />20 uWl <br />Surrogate Drbroinofluoromethime <br />510 <br />Surrogate 12 Dichloroefhane d4 <br />Soo <br />Soo 106 50-150 <br />500 980 50-150 <br />Prepared & Analyzed 19 -Apr -00 <br />500 <br />104 <br />50-150 <br />500 <br />110 <br />50-150 <br />Prepared & Analyzed <br />12 -Apr -00 <br />Soo <br />108 <br />70-130 <br />500 <br />102 <br />50.150 <br />500 <br />100 <br />50-150 <br />Sequoia Anah'ttcal - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chair of <br />0 custody document This analytical report must he reproduced in its entirety <br />Page 4 of 7 <br />