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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> 4D (408)776 9600 <br /> Analytical FAX(408)782 6308 <br /> www sequoialabs c0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNA0375 <br /> 3017 Kilgore Rd Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/28/04 16 50 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source a/aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010389-EPA 5030B waters <br /> Blank 4010389-BLKI) Prepared&Analyzed 01/21/04 <br /> Surrogate 4-Bromefluorobenzene 481 ug/1 5 00 96 86-119 <br /> Laboratory Control Sartt le 4010389-BS1Prepared&Analyzed 01/21/04 <br /> Tert-amyl methyl ether 441 1 0 ugll 500 88 78-117 <br /> Benzene 446 0 50 5 00 89 91-118 <br /> Tert-butyl alcohol 88 6 20 100 89 60-147 <br /> Di-isopropyl ether 4 58 1 0 5 00 92 70-125 <br /> 1,2-Dtbromoethane(EDB) 5 13 0 50 5 00 103 85-125 <br /> 1,2-Drchloroethane 4 82 0 50 5 00 96 77-126 <br /> Ethanol 81 5 100 100 82 55-200 <br /> Ethyibenzene 525 050 5 00 105 89-122 <br /> Ethyl tert-butyl ether 443 1 0 Soo 89 71-120 <br /> Methyl tert-butyl ether 4 48 0 50 5 00 90 70-122 . <br /> Toluene 4 80 0 50 5 00 96 84-119 <br /> Xylenes(total) 158 0 50 150 105 86-132 <br /> Surrogate Dibromofluoromethane 5 15 " 5 00 103 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 481 500 96 74-135 <br /> Surrogate Toluene-d8 4 63 5 00 93 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 71 5 00 94 86-119 <br /> Matrix Spike(4010389-MSI) Source P401264-04 Prepared&Analyzed 01/21/04 <br /> Tert-amyl methyl ether 5 72 1 0 u&4 5 00 1 3 88 78-117 <br /> Benzene 6 17 0 50 500 1 5 93 81-118 <br /> Tert-butyl alcohol 103 20 100 ND 103 60-147 <br /> Dr-isopropyl ether 4 60 1 0 5 00 ND 92 70-125 <br /> 1,2-Dtbromoethane(EDB) 5 40 0 50 5 00 ND 108 85-125 <br /> 1,2-Drchloroethane 5 09 0 50 5 00 ND 102 77-126 <br /> Ethanol lot 100 100 ND 101 55-200 <br /> Ethyibenzene 5 59 0 50 500 022 107 89-122 <br /> Ethyl tent butyl ether 4 44 1 0 500 ND 89 71-120 <br /> Methyl tert-butyl ether 145 0 50 5 00 it 70 70-122 <br /> Toluene 5 60 0 5o 5 00 0 68 98 84-119 <br /> Xylenes(total) 167 0 50 150 0 62 107 86-132 <br /> Surrogate-Dibromofluoromethane 4 75 500-- 95-84-122 <br /> Surrogate 1 2-Drchloroethane-d4 4 42 5 00 88 74 135 <br /> Surrogate Toluene-d8 437 5 00 87 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 73 500 95 86-I19 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chat <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced rn its entirety <br /> Page 24 of 30 <br />