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Sequoia IHSS McDowell Blvd,North Ste D <br /> + Petaluma,CA 44954 <br /> 863 <br /> qW Analytical FAX(707)792 1(707)792-6342342 <br /> WWW sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/03 I6 58 <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 3100050-EPA 5030 waters <br /> Blank(3100050-BLK1) Prepared&Analyzed 10/02/03 <br /> Tert-amyl methyl ether ND 1 0 ugll <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Elhylbenzene 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 496 " 500 99 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 526 11 500 105 74-135 <br /> urrogafe Toluene-d8 4 92 5 00 98 84-I19 <br /> Labomto Control Sample(3100050-BSI) Prepared&Analyzed 10/02/03 <br /> Tert-amyl methyl ether 5 37 1 0�.gll 500 107 70-1 16 <br /> Benzene 484 050 " 5 00 97 81-118 <br /> Test-butyl alcohol 128 20 " 100 128 62-142 <br /> Di-isopropyl ether 5 11 10 11 500 102 71-121 <br /> Ethanol 141 100 1 100 141 65-135 Q-29 <br /> Ethylbenzene 534 050 " 500 107 89-122 <br /> Ethyl tert-butyl ether 500 10 5 00 100 71-110 <br /> Methyl Cert-butyl ether 563 050 " 500 113 77-123 <br /> Toluene 566 050 11 500 113 84-119 <br /> Xylenes(total) 166 050 " 15 0 111 86-132 <br /> Surrogate Dibromofluoromethane 4 77 1 500 95 84-122 <br /> Surrogate 1 1-Dichloroethane-d4 492 1 500 98 74-135 <br /> Surrogate Toluene-d8 520 " 500 104 84-119 <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 13 of 16 <br />