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�� 1455 McDowell Blvd North Ste <br /> '[/'`'_��%_�\� <br /> Sequoia Petaluma CA 9a9544 <br /> (707)792 1865 <br /> Analytical <br /> FAx(707)792-0342 <br /> . www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P403322 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/27/04 16 33 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4030678-EPA 5030B waters <br /> Blank(4030678-BLKI) Prepared&Analyzed 03/24/04 <br /> Tert-amyl methyl ether ND 10 ugll <br /> Benzene ND 4 50 " <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> dwylenes(total) ND 0 50 " <br /> 'Surrogate Drbromofluoromethane 592 5 00 118 84-122 <br /> Surrogate 12-Dichloroethane-d4 6 62 5 00 132 74-135 <br /> Surrogate Toluene-d8 4 85 5 00 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 518 5 00 104 86-119 <br /> Laboratory Control Sample(4030678-BS1) Prepared&Analyzed 03/24/04 <br /> Tert amyl methyl ether 522 10 ug/l 500 104 79-117 <br /> Benzene 483 0 50 500 97 81-118 <br /> Tert-butyl alcohol 94 1 20 100 94 60-147 <br /> Di-isopropyl ether 550 10 500 Ho 70-125 <br /> 1,2 Dibromoethane(EDB) 524 050 500 105 85-125 <br /> 1 2-Dichloroethane 553 050 500 NI l 77-126 <br /> Ethanol 92 7 100 100 93 55-200 <br /> Ethylbenzene 475 0 50 Soo 95 89-122 <br /> Ethyl tert-butyl ether 539 10 Soo 108 71-120 <br /> Methyl tert-butyl ether 529 050 500 106 70-122 <br /> Toluene 4 73 0 50 500 95 84-119 <br /> Xylenes(total) 14 8 050 15 0 99 86-132 <br /> Surrogate Dibromofluoromethane 518 5 00 104 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 539 5 00 108 74-135 <br /> Surrogate Toluene-d8 459 5 00 92 84-119 <br /> Surrogate 4-Bromofluorobenzene 490 5 00 98 86-119 <br /> Sequoia Analytical-Petaluma 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 to its entirety <br /> Page 4 of 6 <br />