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a— ) <br /> 885 Jarvis Drive <br /> Sequoia Morgan 4 37 <br /> 08)776 9600 <br /> W Analytical FAX(408)782 6308 <br /> WWW sequoialabs com� <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton, CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Protect Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <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 4G21002 -EPA 5030B PIT <br /> Blank(4G21002-BLK1) Prepared&Analyzed 07/21/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 " <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 /> Ethylbenzene ND 050 " <br /> Methyl text-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 • <br /> Gasoline Range Organics(C4 C12) ND 50 " <br /> Surrogate 1 1-Dichloroethane d4 4 76 5 00 95 78-129 <br /> Laboratory Control Sample(4G21002-BSI) Prepared&Analyzed 07121/04___ <br /> tert-Amyl methyl ether T 10 1 050 ug/l. 100 - _ — 101 _ 82-140-- <br /> Benzene 108 050 100 108 69 124 <br /> Cert-Butyl alcohol 51 6 20 " Soo 103 56-131 <br /> Di-isopropyl ether 109 050 100 109 76 130 <br /> 1,2-Dtbromoethane(EDB) 108 050 100 108 77 132 <br /> 1,2-Dichloroethane 109 050 100 109 77436 <br /> Ethanol 198 100 200 99 31-143 <br /> Ethyl tert-butyl ether 108 050 100 1108 81-121 <br /> Ethylbenzene 103 050 100 103 84-132 <br /> Methyl cert butyl ether 10 6 050 100 106 63-137 <br /> Toluene 106 050 100 106 78-129 <br /> Xylenes(total) 294 0 50 300 98 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 487 500 97 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis • <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 24 <br />