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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,G 94954 <br /> (707)792-1965 <br /> FAX Analytical wwscq 7)labsco2 <br /> www sequoaalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrtm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vemon 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 '/WEC Limits RPD lama Notes <br /> Batch 4090738-EPA 5030B waters/EPA 8260B <br /> Blank(4090738-BLKI) Prepared&Analyzed 09/29/04 <br /> Tert-amyl methyl ether ND 10 ugr9 <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 /> W.rroogate Dibromofluoromethane 435 11 5 00 87 84-122 <br /> gate 1 2-Dichloroethane-d4 452 " 500 90 74-135 <br /> Surrogate Toluene48 453 " 500 91 84-119 <br /> Surrogate 4-Bromofluorobenzene 430 Soo 86 86-119 <br /> Laboratory Control Sample(4090738-BS1) Prepared&Analyzed 09/29/04 <br /> Tert-amyl methyl ether 490 To ugll 500 96 78-117 <br /> Benzene 5 08 050 500 102 81-118 <br /> Ten-butyl alcohol 922 20 " too 92 60-147 <br /> Di-isopropyl ether 4 71 10 500 94 70-125 <br /> 1,2-Dtchloroethane 502 050 " Soo 100 77-126 <br /> Ethanol 873 100 " 100 87 55-200 <br /> Ethylbenzene 496 050 " 500 99 89-122 <br /> Ethyl tert-butyl ether 4 76 to 500 95 71-120 <br /> Methyl ten butyl ether 473 0 50 500 95 70-122 <br /> Toluene 506 050 500 101 84-119 <br /> Xylenes(total) 151 050 150 101 86-132 <br /> Surrogate Dibromofluoromethane 429 " 500 86 84-122 <br /> Surrogate 12-Dichloroethane-d4 441 11500 88 74-135 <br /> Surrogate Toluene-d8 463 1, 500 93 84-119 <br /> Surrogate 4-Bromofluorobenzene 422 500 84 84-119 LG <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 entirely <br /> Page 21 of 29 <br />