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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 sequoia]abs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Dnve 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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD limit Notes <br /> Batch 5010108-EPA 5030B waters/EPA 8260B <br /> Blank(5010108-BLKI) Prepared&Analyzed 01/09/05 <br /> Tert-amyl methyl ether ND 1 0 uglE <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 0 50 " <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 /> Surrogate Dibromofluoromethane 5 09 500 102 84-122 <br /> urrogate 1 2-Drchloroethane-d4 5 74 „ 500 115 74-135 <br /> Surrogate Toluene d8 529 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 540 500 108 86-119 <br /> Laboratory Control Sample(5010108-BSI) Prepared&Analyzed 01/09/05 <br /> Tert-amyl methyl ether 526 1 0 ugll 500 105 78-117 <br /> Benzene 497 050 500 99 81-118 <br /> Tert-butyl alcohol 887 20 100 89 60-147 <br /> Di isopropyl ether 529 10 5 00 106 70-125 <br /> 1,2-Drchloroethane 562 050 500 112 77-126 <br /> Ethanol 994 100 100 99 55-200 <br /> Ethylbenzene 4 79 050 500 96 89-122 <br /> Ethyl tert-butyl ether 4 95 10 500 99 71-120 <br /> Methyl tert-butyl ether 5 19 050 500 104 70-122 <br /> Toluene 4 89 050 500 98 84-119 <br /> Xylenes(total) 148 050 15 0 99 86-132 <br /> Surrogate Drbromofluoromethane 4 91 500 98 84 122 <br /> Surrogate 1 2-Drchloroethane-d4 536 5 00 107 74 135 <br /> Surrogate Toluene d8 511 5 00 102 84 119 <br /> Surrogate 4-Bromofluorobenzene 497 500 99 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 /> I <br /> Page 25 of 33 <br />