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Sequoia <br />� Analytical <br />404 N Wiget Lane <br />Walnut Creek C4 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />(;Mier Ryan In(, - Dublin Prole(,t Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 18 -Apr -00 11 39 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Sourcc. %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD14016 - EPA 5030B [PIT] <br />513 <br />0 50 tngrm' Air <br />500 <br />103 <br />Blank (OD14016-BLKI) <br />Chlorobemene <br />499 <br />Prepared & Analyzed <br />14 -Apr -00 <br />Hexachlorobutadiene <br />ND <br />050 mgim' Air <br />496 <br />050 <br />Isopropylbenzene <br />ND <br />050 <br />Toluene <br />454 <br />p-Isopropyltoluene <br />ND <br />050 <br />60-140 <br />Tnchloroethene <br />Methylene chloride <br />ND <br />2 0 <br />998 <br />60-140 <br />Naphthalene <br />ND <br />10 <br />500 <br />106 <br />n Propylbenzene <br />ND <br />050 <br />500 <br />Stvrene <br />ND <br />050 <br />11,12' Cetrachloroethazte <br />ND <br />050 <br />1 12 2 -Tetrachloroethane <br />ND <br />050 <br />Tetrachloroethene <br />ND <br />050 " <br />Toluene <br />ND <br />050 <br />chlorobenzene <br />ND <br />050 " <br />chlorobenzene <br />*0'rn"chloroethane <br />ND <br />050 <br />ND <br />050 <br />1,1,2-Tnchloroethane <br />ND <br />050 " <br />Trichloroethene <br />ND <br />050 " <br />Tnchlorofluoromethane <br />ND <br />10 <br />1,2,3-Tnchlorapropane <br />ND <br />050 " <br />1.2,4-Trmwthylbenzene <br />ND <br />050 " <br />1,3,5-Trimethylbenzene <br />ND <br />050 " <br />Vmyl ditmcle <br />ND <br />050 " <br />Total Xylenes <br />ND <br />050 " <br />Surrogate Dibromofluoromethane <br />330 <br />Soo <br />106 70-130 <br />Surrogate 1 1-Dichloroethane-d4 <br />490 <br />500 <br />980 70-130 <br />Surrogate Toluene -d8 <br />Soo <br />500 <br />100 70-130 <br />Surrogate 4-Bromofluorobetrene <br />460 <br />500 <br />920 70-130 <br />LCS (OD14016-BSI) <br />Prepared & Analvzed <br />14 -Apr -00 <br />Batizene <br />513 <br />0 50 tngrm' Air <br />500 <br />103 <br />60-140 <br />Chlorobemene <br />499 <br />050 <br />500 <br />978 <br />60-140 <br />1,1-Dichloroethene <br />496 <br />050 <br />500 <br />992 <br />60 140 <br />Toluene <br />454 <br />050 <br />50 0 <br />908 <br />60-140 <br />Tnchloroethene <br />494 <br />050 <br />50 0 <br />998 <br />60-140 <br />Surrogate Dibromofluoromethane <br />530 <br />500 <br />106 <br />70-130 <br />Surrogate 1 1-Diehloroethane d4 <br />470 <br />500 <br />940 <br />'%0-130 <br />Siota Analytical - Walnut Creek The results mthis report apply to the samples analyzed iii accordance with the chain of <br />6 custody document Thrs analytical report must be reproduced in its entirety <br />Page 20 of 22 <br />