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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1965707)(707)792-0342342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Protect Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical•Petaluma <br /> Reporting Spike Source %REC RPD <br /> IAnalytc Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3120631-EPA 5030B waters <br /> Blank 3120631-BLK1 Prepared&Analyzed 12/22/03 <br /> Tert-amyl methyl ether ND 10 ugll <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tent-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> rrrogate Dibromofluoromethane 5 19 " 500 104 84-121 <br /> urrogate 12-Dichloroethane-d4 5 42 " 5 00 108 74-135 <br /> Surrogate Toluene-d8 4 70 5 00 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 79 500 96 86-119 <br /> Laboratory Control Sample 3120631-BS1 Prepared&Anal d 12/22/03 <br /> Tert-amyl methyl ether 5 22 1 0 11911 500 104 78-117 <br /> Benzene 542 0 50 500 108 81-118 <br /> Tert-butyl alcohol 963 20 100 96 60-I47 <br /> Di-isopropyl ether 5 62 1 0 5 00 112 70-125 <br /> 1,2-Dtbromoethane(EDB) 5 48 0 50 5 00 110 85-125 <br /> 1,2-Dichloroethane 5 71 0 50 5 00 114 77-126 <br /> Ethanol 101 100 100 101 55-200 <br /> Ethylbenzene 5 38 0 50 5 00 108 89-122 <br /> Ethyl tert-butyl ether 5 38 1 0 500 108 71-120 <br /> Methyl tert-butyl ether 547 0 50 500 109 70-122 <br /> Toluene 5 39 0 50 500 108 84-119 <br /> Xylenes(total) 159 0 50 150 106 86-132 <br /> Surrogate Dibromofluorom ethane 5 00 500 100 84-122 <br /> Surrogate 12 Dichloroethane-d4 5 23 5 00 105 74-135 <br /> Surrogate Toluene-d8 4 72 5 00 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 515 5 00 103 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 27 of 35 <br />