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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www segaoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source °/oREC RPD <br /> Analyte Result Limit Units level Result °/uREC Limits RPD Lima Notes <br /> Batch 5010152-EPA 50308 waters/EPA 8260B <br /> Laboratory Control Sample(5010152-BS1) Prepared&Analyzed 01/12/05 <br /> Tert-amyl methyl ether 494 1 0 ug/l 500 99 78-117 <br /> Benzene 545 050 500 109 81-118 <br /> Tert-butyl alcohol 936 20 100 94 60-147 <br /> Di-isopropyl ether 521 1 0 500 104 70-125 <br /> 1,2-Dichloroethane 505 050 Soo 101 77-126 <br /> Ethanol 148 100 100 148 55-200 <br /> Ethylbenzene 5 35 050 500 107 89-122 <br /> Ethyl tert-butyl ether 481 l 0 500 96 71-120 <br /> Methyl tert-butyl ether 497 050 Soo 99 70-122 <br /> Toluene 5 33 050 500 107 84-119 <br /> Xylenes(total) 169 050 150 113 86-132 <br /> Surrogate Dibromofluoromethane 499 500 100 84-122 <br /> eSurrogate <br /> Surrogate 1,2-Dichloroethane-d4 476 500 95 74-135 <br /> Toluene-d8 537 500 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 512 500 102 86-119 <br /> Matrix Spice(5010152-MS1) Source P501061-09 Prepared&Analyzed 01/12/05 <br /> Ten-amyl methyl ether 497 1 0 ugtl Soo ND 99 78-117 <br /> Benzene 5 12 050 5 00 ND 102 81-118 <br /> Ten-butyl alcohol 91 7 20 100 ND 92 60-147 <br /> Di-isopropyl ether 509 1 0 500 ND 102 70-125 <br /> 1,2-Dichloroethane 4 92 050 500 ND 98 77-126 <br /> Ethanol 104 100 " 100 ND 104 55-200 <br /> Ethylbenzene 4 96 050 5 00 ND 99 89-122 <br /> Ethyl tert-bury]ether 479 10 500 ND 96 71-120 <br /> Methyl tert butyl ether 748 050 5 00 2 5 100 70-122 <br /> Toluene 502 050 500 ND 100 84-119 <br /> Xylenes(total) 156 050 150 ND 104 86-132 <br /> Surrogate Dibromofluoromethane 501 500 100 84-122 <br /> Surrogate 12-Dichloroethane-d4 486 500 97 74-135 <br /> Surrogate Toluene d8 538 5 00 108 84-119 <br /> Surrogate 4-Bromofluorobenzene 504 500 101 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 an a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 31 of 33 <br />