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izSequoia 1455 McDowePetalluma,CA 949 D <br /> (707)792-1865 <br /> �� Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/04 14 40 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - PetaIuma <br /> Reporting Spike Source "/oREC RPD <br /> Analyte Result Limit Units Level Result %REC limits RPD Limit Notes <br /> Batch 4110667-EPA 5030B waters/EPA 8260B <br /> Blank(4110667-BLK1) Prepared&Analyzed 11/26/04 <br /> Tert-amyl methyl ether ND 10 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> I,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> urrogate Dibromofluoromethane 474 500 95 84-111 <br /> Surrogate 1 2-Dichloroethane-d4 411 500 82 74-135 <br /> Surrogate Toluene-d8 439 500 88 84-119 <br /> Surrogate 4-Bromofluorobenzene 529 500 106 86-119 <br /> Laboratory Control Sample(4I10667-BSI) Prepared 11/26/04 Analyzed 11/27/04 VQ'1' <br /> Tert-amyl methyl ether 502 1 0 ug/1 500 too 78-117 <br /> Benzene 501 050 500 100 81-118 <br /> Tert-butyl alcohol 103 20 " 100 103 60-147 <br /> D&-isopropyl ether 5 11 10 Soo 102 70-125 <br /> 1 2-Dibromoethane(EDB) 529 050 500 106 85-125 <br /> 1,2-Dichloroethane 480 050 500 96 77-126 <br /> Ethanol 936 100 100 94 55-200 <br /> Ethylbenzene 5 11 050 500 102 89-122 <br /> Ethyl tert butyl ether 491 to 500 98 71-120 <br /> Methyl tert-butyl ether 474 050 500 95 70-122 <br /> Toluene 554 050 500 111 84-119 <br /> Xylenes(total) 164 050 ISO 109 86-132 <br /> Surrogate Dibromofluoromethane 505 500 101 84-122 <br /> Surrogate 12-Dichloroethane-d4 465 500 93 74-135 <br /> Surrogate Toluene-d8 528 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 548 500 110 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 /> • Ars analytical report must be reproduced to its entirety <br /> Page 15 of 19 <br />