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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 44954 <br /> (ma)792-1865 <br /> �► <br /> FAX 7920342 <br /> Analytical <br /> www sequotquo�alabs com <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <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 '/.RFC Limits RPD Limit Notes <br /> Batch 4120414-EPA 5030B waters/EPA 8260B <br /> Blank(4120414-BLKI) Prepared&Analyzed 12/20/04 <br /> Tert-amyl methyl ether ND 1 0 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> �lenes(total) ND 050 <br /> '6urrogate Dibromofluoromethane 481 500 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 5 14 500 103 74-135 <br /> Surrogate Toluene-d8 501 500 100 84-119 <br /> Surrogate 4 Bromofluorobenzene 537 5 00 107 86-119 <br /> Laboratory Control Sample(4120414-BSI) Prepared&Analyzed 12/20/04 <br /> Tert-amyl methyl ether 5 05 l 0 ug/I 500 101 78-117 <br /> Benzene 4 58 050 500 92 81-118 <br /> Tert-butyl alcohol 85 6 20 100 86 60-147 <br /> DI-isopropyl ether 492 1 0 500 98 70-125 <br /> 1,2-Dibromoethane(EDB) 4 79 050 500 96 85-125 <br /> 1,2-Dichloroethane 520 050 Soo 104 77-126 <br /> Ethanol 81 3 100 100 81 55-200 <br /> Ethylbenzene 464 0 50 500 93 89-122 <br /> Ethyl tert-butyl ether 495 l 0 500 99 71-120 <br /> Methyl tert-butyl ether 4 94 050 500 99 70-122 <br /> Toluene 4 58 050 5 00 92 84-119 <br /> Xylenes(total) 14 2 0 50 150 95 86-132 <br /> Surrogate Dibromofluoromethane 498 500 100 84-122 <br /> Surrogate 1 2-Dichloroeihane-d4 536 500 107 74-135 <br /> Surrogate Toluene-d8 504 5 00 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 79 500 116 86-119 <br /> Sequoia Analytical-Petaluma The results to 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 16 of 21 <br />