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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792 1865 <br /> FAX 42 <br /> Analytical wwsequ7ialabs om <br /> . www sequotalabs corn <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P402408 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elanh 03/02/04 10 16 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - PetaIuma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020577-EPA 5030B waters <br /> Laboratory Control Sample Dup(4020577-BSD1) Prepared&Analyzed 02/26/04 <br /> Tert-amyl methyl ether 475 10 ug!] 500 95 78-117 5 20 <br /> Benzene 472 050 500 94 81-118 08 20 <br /> Tert-butyl alcohol 122 20 100 122 60-147 14 20 <br /> Di-isopropyl ether 462 10 500 92 70-125 2 20 <br /> 1,2-I)ibromoethane(EDB) 520 050 500 104 85-125 7 20 <br /> 1,2-Dichloroethane 498 050 Soo t00 77-126 5 20 <br /> Ethanol 122 100 100 122 55-200 31 20 QR-02 <br /> Ethylbenzene 492 050 500 98 89-122 02 20 <br /> Ethyl tert-butyl ether 457 10 500 91 71-120 5 20 <br /> Methyl tert-butyl ether 495 050 5 00 97 70-122 6 20 <br /> Toluene 438 050 500 88 84-119 05 20 <br /> AdhkXylencs(total) 152 050 15 0 101 86-132 0 20 <br /> urrogate Dibromofluoromethane 589 600 98 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 584 600 97 74-135 <br /> Surrogate Toluene-d8 576 600 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 629 600 105 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 busts <br /> Thts analytical report must be reproduced to its entirety <br /> Page 17 of 18 <br />