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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrtm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarih 01/18/05 1134 <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 5010022-EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample(5070022-BSI) Prepared&Analyzed 01/04/05 <br /> 1 ert amyl methyl ether 1 10 10 ug/l 100 110 78 117 <br /> Benzene 0 957 050 100 96 81-118 <br /> Tert butyl alcohol 176 20 200 88 60-147 <br /> Di-isopropyl ether 100 1 0 100 100 70-125 <br /> l 2 Dichloroethane 0 974 050 1 00 97 77-126 <br /> Ethanol 256 100 200 128 55-200 <br /> Ethylbenzene 0 941 050 1 00 94 89-122 <br /> Ethyl tent-butyl ether 0 982 1 0 100 98 71-120 <br /> Methyl tert-butyl ether 0 976 050 1 00 98 70-122 <br /> i <br /> Toluene 0 983 050 100 98 84-119 <br /> Xylenes(total) 299 050 300 100 86-132 <br /> �Surrogate Dibromofluoromelhone 470 500 94 84-122 <br /> urrogate 1 2-Dichloroethane-0 461 500 92 74-135 <br /> Surrogate Toluene-d8 527 500 Io5 84-119 <br /> Surrogate 4-Bromofluorobenzene 514 Soo 103 86 119 <br /> Laboratory Control Sample Dup(5010022-BSDI) Prepared&Analyzed 01/04/05 <br /> Tert-amyl methyt ether 1 07 1 0 ug11 1 00 107 78 117 3 20 <br /> Benzene 0 944 050 1 00 94 81-118 1 20 <br /> Tert-butyl alcohol 177 20 200 88 60 147 06 20 <br /> Di-isopropyl ether 1 02 1 0 1 00 IO2 70-125 2 20 <br /> 1 2-Dichloroethane 0 971 050 " 100 97 77-126 03 20 <br /> Ethanol 265 100 200 132 55-200 3 20 <br /> Ethylbeiizene 0 938 050 100 94 89-122 03 20 <br /> Ethyl tert-butyl ether 0 985 1 0 100 98 71-120 03 20 <br /> Methyl tert-butyl ether 0 959 050 1 00 96 70-122 2 20 <br /> Toluene 1 01 050 100 101 84-119 3 20 <br /> Xylenes(total) 292 050 300 97 86-132 2 20 <br /> Surrogate Dibromofluoromethane 4 77 500 95 84-122 <br /> Surrogate 12-Dichloroethane d4 457 500 91 74-135 <br /> Surrogate Toluene-d8 531 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 513 500 103 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 in its entirety <br /> Page 24 of 33 <br />