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4 t 5:) <br />Sequoia <br />wo Analytical <br />Gettler Ryan, Inc -Dublin Project Cheaper <br />6747 Sierra Court Suite J Project Number Chevron # 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 Wiget Lane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs cpm <br />Reported <br />12 -Apr -00 11 36 <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD09001 - EPA 5030B [PIT] <br />Matrix Spike Dup (OD09001-MSD1) Source W004029-07 Prepared & Analyzed 09 -Apr -00 <br />Methyl tert-butyl ether 449 20 ug/l 500 ND 898 60-150 3 17 25 <br />Surrogate Dibromofluoromethane 510 500 101 50-150 <br />Surrogate 1 2 Dichloroethane d4 500 500 100 SO -150 <br />Batch OD10012 - EPA 5030B JP/T] <br />Blank (OD10012-BLKI) Prepared 09 -Apr -00 Analyzed 10 -Apr -00 <br />tent -Butyl alcohol ND 20 mglm' Air <br />Mathyl lert-butyl ether ND 050 <br />Di -isopropyl ether ND 050 <br />Ethyl tent -butyl ether ND 050 " <br />tert-Amyl methyl ether ND 050 " <br />Surrogate Dibromofluoromethane <br />510 <br />500 104 <br />50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />520 <br />500 104 <br />50-150 <br />LCS (OD10012-BS1) <br />Prepared 09 -Apr -00 Analyzed <br />10 -Apr -00 <br />Methyl tert-butyl ether <br />410 <br />0 50 mglW Air 500 820 <br />70-130 <br />Surrogate Dibromofluoromethaie <br />510 <br />500 101 <br />50-150 <br />Surrogate 12-Dtchloroelhane-d4 <br />Soo <br />500 100 <br />50-150 <br />LCS Dup (OD10012-BSD1) <br />Prepared 09 -Apr -00 Analyzed <br />10 -Apr -00 <br />Methyl tent -butyl ether <br />461 <br />0 50 mg/m' Au 500 922 <br />70-130 117 25 <br />Surrogate Dibr+omofluoromethare <br />460 <br />Soo 920 <br />50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />520 <br />Soo 104 <br />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 to its entire)o <br />Page 11 of 12 <br />M11 <br />