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Sequoia <br />� Analytical <br />404 N Wlget Lane <br />Walnut Geek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequotalabs com <br />ttler Ryan Inc -Dublin Project Cheaper <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 12 -Apr -00 11 36 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />lnalyte Result Limit Units Level Result %REC Linuts RPD Limit Notes <br />Batch OD09001 - EPA 5030B JP/TI <br />410 <br />20 ugA 500 820 70- 430 <br />Surrogate Dibromoflrtaromedwte <br />Blank (OD09001-BLK2) <br />500 101 50.150 <br />Swmgate 12Dichlorvedham-d4 <br />Prepared 09 -Apr -00 Analyzed 10 -Apr -00 <br />tort -Butyl alcohol <br />ND <br />100 <br />ugll <br />Methyl tent butyl ether <br />ND <br />20 <br />Di-isopropvl ether <br />ND <br />20 <br />Ethyl tort -butyl ether <br />ND <br />20 <br />tett Amyl methyl ether <br />ND <br />20 <br />" <br />Surrogate Dibromofluoromethane <br />510 <br />Soo 104 50-150 <br />Surrogate 1 2-Dichloroethane d4 <br />510 <br />500 104 50-150 <br />Blank (OD09001-BLK3) <br />Prepared & Analyzed 10 -Apr -00 <br />tert-Butyl aloohol <br />ND <br />100 <br />Ug/1 <br />Methyl ten -butyl ether <br />ND <br />20 <br />" <br />Do -isopropyl ether <br />ND <br />20 <br />" <br />ND <br />20 <br />Arylether <br />Amyl methyl. ether <br />ND <br />20 <br />Surrogate DibromyRuorometharte <br />440 <br />500 880 50.150 <br />Surrogate 1 1-Dichloroethane-d4 <br />450 <br />500 900 50-150 <br />LCS (OD09001-BS2) <br />Prepared 09 -Apr -00 Analyzed 10 -Apr -00 <br />Methyl tat -butyl ether <br />410 <br />20 ugA 500 820 70- 430 <br />Surrogate Dibromoflrtaromedwte <br />510 <br />500 101 50.150 <br />Swmgate 12Dichlorvedham-d4 <br />500 <br />500 100 50-150 <br />LAM (OD090O1-BS3) <br />Prepared & Analyzed 10 -Apr -00 <br />Methyl test -butyl ether <br />459 <br />20 Ug/1 500 918 70.130 <br />Surrogate AbromofJuoromethane 510 500 102 so -ISO <br />Surrogate 1 1-Dichloroethane-d4 510 " 500 104 50-150 <br />Matra Spike (OD09001-MSI) Source W004029-07 Prepared & Analvzed 09 -Apr -00 <br />Methyl tett-butvl ether 435 20 ugll 500 ND 870 60-150 <br />Surrogate Dibromofluoromefhane 510 500 102 50-150 <br />Surrogate 12-Dichloroethane-d4 520 500 104 50-150 <br />Sequoia Analvueal - Walnut Creek The results in this report apply to the samples miahzed in accordance with the chain of <br />9 custody document Thir analytical report mast be reproduced to its entirety <br />Page 10 of 12 <br />PR <br />