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QSequoia <br />� Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite 1 Project Number Chevron SS99-5775 <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 WigetLane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs com <br />Reported <br />25 -Apr -00 17 37 <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD21021 - EPA 5030B [PIT] <br />Blank (OD21021-BLKI) Prepared & Analyzed 20 -Apr -00 <br />Cert -Butyl alcohol ND 100 ug/l <br />1lethyl tcrt-butyl ether ND 20 <br />Di -isopropyl ether ND 20 <br />F,thv( tett butyl ether ND 20 <br />tort-Amyi methyi ether 'SID 20 <br />Surrogate Dibromofluoromethane <br />440 <br />500 880 50 150 <br />Surrogate 1 1-Dichlormthane W <br />390 <br />J00 780 50-150 <br />Blank (OD21021-BLK2) <br />Prepared & Analyzed 21 -Apr -00 <br />tent -Butyl alcohol <br />ND <br />100 ug/l <br />Methyl tent -butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />Ethyl tat -butyl ether <br />ND <br />20 " <br />Cert -Amyl methyl ether <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />480 <br />500 960 50-150 <br />Surrogate 1 1-Dichloroethane-& <br />410 <br />Soo 810 50.150 <br />LCS (OD21021-BSI) <br />Prepared & Analyzed 20 -Apr -00 <br />Mdhyl tat butyl ether <br />509 <br />20 UO <br />Soo 102 70-130 <br />Surrogate Dibromofimoromethane 420 Soo 840 50 -ISO <br />Surrogate 11-Drchlorvethane-d4 370 Soo 740 50-150 <br />LCS (OD21021-BS2) Prepared & Analyzed- 21 -Apr -00 <br />Methyl tat -butyl ether 600 20 ug/l Soo 120 70-130 <br />Surrogate Dibromofluoromethane <br />Surrogate I2-Drchloroethane-d4 <br />460 500 910 50.150 <br />400 500 Soo 50.150 <br />Matrix Spike (OD21021-MSI) Source W004314-01 Prepared & Analyzed 20 -Apr -00 <br />Methyl tett-butyl ether 542 20 ugll 500 ND 108 60-150 <br />Surrogate Dibromofluoromethane 430 500 860 50-150 <br />Surrogate l 1-Dichloroethane-d4 390 500 180 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 Pus analytical report must be reproduced in its entirety <br />0 <br />Page 8 of 10 <br />DR. <br />