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y 885 Jarvis Dr <br /> Morganf95037 <br /> Sequoia (40 77 <br /> ` 8)776 9600 <br /> 308 <br /> Analytical FAX cquai lab Goin <br /> www sequoialahs coal <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595, Stockton,CA MNG0109 <br /> 3017 Kilgore Rd Suite 100 Project Number 62546 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 20 24 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result "/"REC Limits RPD Limit Notes <br /> Batch 4G14020-EPA 5030B P/T <br /> Blank 4G14020-BLK1) Prepared&Analyzed 07/14/04 <br /> tert-Amyl methyl ether ND 050 ugA <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 50 <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzcnc ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Coluene ND 050 " <br /> ylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 1 2-Dtchloroethane-d4 213 250 85 78-129 <br /> Laboratory Control Sample(4G14020-BSI) Prepared&Analyzed 07/14/04 <br /> tert-Amyl methyl ether 102 050 ug11 100 102 82-140 <br /> Benzene 941 050 10 0 94 69-124 <br /> tert-Butyl alcohol 548 5 0 500 110 56-131 <br /> Di-isopropyl ether 998 0 50 too 100 76-130 <br /> 1,2-Dibromoethane(EDB) 105 0 50 100 105 77-132 <br /> 1,2-Dichloroethane 100 050 10 0 100 77-136 <br /> Ethanol 193 100 200 96 31-143 <br /> Ethyl tert-butyl ether 993 0 50 10 0 98 81-121 <br /> Ethylbenzene 10 8 050 too 108 84-132 <br /> Methyl tert-butyl ether 106 0 50 100 106 63-137 <br /> Toluene 104 0 50 10 0 104 78-129 <br /> Xylenes(total) 330 050 30 0 110 83-137 <br /> Surrogate 12-Drehloroethane-d4 208 250 83 78-129 <br /> �Sequata Anafyttcal -Morgan Htll The results rn this report apply to the samples analyzed rri accordance wuh the chain of <br /> custody document Unless otherwese staled results are repor[ed on a we!weight basis <br /> Virs analytical report must be reproduced in its entirely <br /> Page 13 of 21 <br />