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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA94954 <br /> 79 <br /> (707)792-1865 <br /> Analytical 342 <br /> www sequoiFAX(707) <br /> com <br /> i <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <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 4100021 -EPA 5030B waters/EPA 8260B <br /> Blank(4100021-BLKI) Prepared&Analyzed 10/01/04 <br /> Tert-amyl methyl ether ND 10 ugt] <br /> Benzene ND 050 " <br /> Tert butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> �rrogate Dibromofluoromethane 499 II Soo 100 84-122 <br /> -gate 12 Dichloroeihane-d4 547 Soo 109 74-135 <br /> Surrogate Toluene-d8 566 500 113 84-119 <br /> Surrogate 4-Bromofluorobenzene 516 500 103 86-119 <br /> Laboratory Control Sample(4100021-BSI) Prepared&Analyzed 10/01/04 <br /> Tert-amyl methyl ether 451 10 ug/l 500 90 78-117 <br /> Benzene 520 050 500 104 81-118 <br /> Tort butyl alcohol 650 20 100 65 60-147 <br /> Di-isopropyl ether 474 10 500 95 70-125 <br /> 1,2-Dichloroethane 485 050 " 500 97 77-126 <br /> Ethanol 164 100 100 164 55-200 <br /> Ethylbenzene 498 050 Soo 100 89-122 <br /> Ethyl tert-butyl ether 460 10 500 92 71-120 <br /> Methyl tert-butyl ether 479 050 500 96 70-122 <br /> Toluene 507 050 500 101 84-119 <br /> Xylenes(total) 153 050 150 102 86-132 <br /> Surrogate Dibromofluoromethane 530 500 106 84-122 <br /> Surrogate 11-Dichloroethane-d4 324 500 105 74-135 <br /> Surrogate Toluene-d8 571 500 114 84-119 <br /> Surrogate 4-Bromofluorobenzene 526 500 105 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 basis <br /> This analytical report must be reproduced in its entirety <br /> Page 25 of 29 <br />