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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)'792-18b5 <br /> 342 <br /> Analytical www <br /> com <br /> www scquoialabs com <br /> s <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P502227 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/26/05 14 14 <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 I.rmits RPD Limit Notes <br /> Batch 5020319-EPA 5030B waters/EPA 8260E <br /> Blank(5020319-BLK1) Prepared&Analyzed 02/25/05 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 12-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND t00 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> �Surrogare Dibromofluoromethane 558 I 500 112 84-122 <br /> Surrogate 12-Dtehloroethane-d4 5 99 500 120 74-135 <br /> Surrogate Toluene-d8 4 93 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 531 5 00 106 86-119 <br /> Laboratory Control Sample(5020319-BS1) Prepared&Analyzed 02/25/05 <br /> Tert-amyl methyl ether 539 10 ug/I 500 108 78-117 <br /> Benzene 447 050 5 00 89 81-118 <br /> Tert-butyl alcohol 994 20 100 99 60-147 <br /> Di-Isopropyl ether 446 1 0 500 89 70-125 <br /> 1,2-Dibromoethane(EDB) 554 050 500 111 85-125 <br /> 1,2-Dichloroethane 6 17 050 500 123 77 126 <br /> Ethanol 752 100 100 75 55-200 <br /> Ethylbenzene 4 88 050 500 98 89-122 <br /> Ethyl tert-butyl ether 492 10 500 98 71-120 <br /> Methyl tert butyl ether 5 32 050 500 106 70-122 <br /> Toluene 478 0 50 500 96 84-119 <br /> Xylenes(total) 14 8 050 150 99 86-132 <br /> Surrogate Dibromofluoromethane 559 Soo 111 84-122 <br /> Surrogate 12-Dichloroethane-d4 602 500 110 74-135 <br /> Surrogate Toluene-d8 518 500 104 84-119 <br /> Surrogate 4-Bromof7uorobenzene 503 500 101 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the charn 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 16 of 18 <br />