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QSequoia <br />� Analytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />er Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron SS99-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 21 -Apr -0O 10 43 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />inalvte Result Limit Units Level Result %REC Ltmus RPD Limit Notes <br />Batch OD20010 - EPA 5030E fP/TJ <br />Blanc. (OD20010-BLKI) <br />Prepared & Analyzed 20 -Apr -00 <br />tent Butyl alcohol <br />ND <br />20 mp/m' Au <br />Methvl tert butyl ether <br />ND <br />050 <br />Di isopropyl ether <br />ND <br />050 <br />Ethyl tent -butyl ether <br />ND <br />050 <br />tert-Amyl methyl ether <br />ND <br />050 <br />Surrogate DibromoJluoromethane <br />51 0 <br />500 102 50-150 <br />Surrogate 1 2-Dichloroethane d4 <br />530 <br />500 ) 06 50-150 <br />LCS (OD20010-BSI) <br />Prepared & Analyzed 20 -Apr -00 <br />Methyl tert-butyl ether <br />493 <br />0 50 mgims Air <br />500 996 70-130 <br />Surrogate DibromoJluoromethane Soo Soo 100 50-150 <br />Surrogate 1 2-Dichloroethane-d4 530 500 106 50-150 <br />IAI&Dup (OD20010-BSDI) Prepared & Analyzed 20 -Apr -00 <br />MW tert-butyl ether 585 0 50 mg/ml Air 500 117 70-130 171 25 <br />Surrogate Dibromofluoromethane <br />Surrogate 1 2 Dtchloroethane-d4 <br />Sequoia Analytical - Walnut Creek <br />• <br />500 500 100 50-150 <br />530 500 106 50-150 <br />The retells in thtr report apply to the samples anal3ced to accordance with the chain of <br />custody document Pus analytical report must be reproduced in its entirety <br />:# <br />Page 7 of 8 <br />