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1455 McDowell Blvd North Ste D <br />'•� �" <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX 792 0342 <br /> FAX <br /> sequoiequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P405290 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/02/04 19 44 <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 °/0REC Limits RPD Limit Notes <br /> Batch 4050576-EPA 5030B waters <br /> Blank(4050576-BLKI) Prepared&Analyzed 05/24/04 <br /> Tort-amyl methyl ether ND 10 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1 2-Dibromoethane(EBB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <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 /> �irrrogate Dibromofluoromethane 497 500 99 84-122 <br /> urrogate 1 2-Dichloroethane-d4 536 500 107 74-135 <br /> Surrogate Toluene-d8 478 500 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 538 500 108 86-119 <br /> Laboratory Control Sample(4050576-BSI) Prepared&Analyzed 05/24/04 <br /> Teri amyl methyl ether 501 10 ugll Soo 100 78-117 <br /> Benzene 481 050 500 96 81-118 <br /> Tert-butyl alcohol 998 20 " 100 ]o0 60-147 <br /> Di-isopropyl ether 4 82 to " Soo 96 70-125 <br /> 1,2-Dibromoethane(EDB) 542 050 500 108 85-125 <br /> 1 2-Dichloroethane 5 56 050 500 111 77-126 <br /> Ethanol 905 100 100 90 55-200 <br /> Ethylbenzene 496 050 500 99 89-122 <br /> Ethyl tert-butyl ether 506 to 500 lot 71-120 <br /> Methyl tent-butyl ether 501 050 500 100 70-122 <br /> Toluene 497 050 500 99 84-119 <br /> Xylenes(total) 152 050 150 lo] 86-132 <br /> Surrogate Dibromofluoromethane 469 500 94 84-122 <br /> Surrogate 12-Dichloroethane-d4 509 500 102 74-135 <br /> Surrogate Toluene-d8 4 68 500 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 74 500 95 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 15 of 17 <br />