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ve <br /> Sequoia 9851 CA <br /> Morgan Hill,CA 95037 <br /> Analytical (40&)776 9500 <br /> FAX(408)782 6306 <br /> www scqu oialabs 0 <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 Protect Manager gusty Benkosky 01/28/04 16 50 <br /> Volatile Organic Compounds by EPA Method 82605 -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Umts Level Result %REC Limits RPD Limit Notes <br /> Batch 4010317-EPA 5030E waters <br /> Matrix Spike(4010317-MSI) Source P401188-07 Prepared&Analyzed 01/19/04 _ <br /> Tert-amyl methyl ether 429 to ugA 500 ND 86 78-117 <br /> Benzene 4 44 0 50 5 00 ND 89 81-118 <br /> Tert-butyl alcohol 969 20 100 ND 97 60-147 <br /> Di-isopropyl ether 4 24 1 0 5 00 ND 85 70-125 <br /> 1,2-Dibromoethane(EDB) 5 04 0 50 5 00 ND 101 85-125 <br /> 1,2-Dichloroethane 4 88 050 500 ND 98 77-126 <br /> Ethanol 932 100 100 ND 93 55-200 <br /> Ethylbenzene 498 0 50 5 00 ND 100 89-122 <br /> Ethyl tett-butyl ether 4 27 1 0 5 00 ND 85 71-120 <br /> Methyl tert-butyl ether 4 78 0 50 " 500 0 52 85 70-122 <br /> Toluene 4 68 050 500 ND 94 84-119 <br /> Xylenes(total) t5 0 0 50 150 ND 100 86-132 <br /> Surrogate Dibromofluoromethane 5 16 500 103 84-111 <br /> Surrogate 12-Dichloroethane-d4 4 94 S 00 99 74-135 <br /> Surrogate Toluene-d8 4 73 500 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 83 500 97 86-119 <br /> Matrix Spike Dup(4010317-MSDI) Source P401188-07 Prepared&Analyzed 01/19/04 <br /> Tert-amyl methyl ether 4 41 1 0 ug/l 500 ND 88 78-117 3 20 <br /> Benzene 4 47 0 50 500 ND 89 81-118 0 7 20 <br /> Tert-butyl alcohol 101 20 100 ND 101 60-147 4 20 <br /> Di-isopropyl ether 4 53 1 0 500 ND 91 70-125 7 20 <br /> 1,2-Dibromoethane(EDB) 5 18 050 5 00 ND 104 85-125 3 20 <br /> 1,2-Dichloroethane 5 01 0 50 500 ND 100 77-126 3 20 <br /> Ethanol 908 100 100 ND 91 55-200 3 20 <br /> Ethylbenzene 507 0 50 5 00 ND 101 89-122 2 20 <br /> Ethyl tert-butyl ether 4 46 1 0 5 00 ND 89 71-120 4 20 <br /> Methyl tert-butyl ether 5 1l 0 50 5 00 0 52 92 70-122 7 20 <br /> Toluene 4 69 0 50 500 ND 94 84-119 0 2 20 <br /> Xylenes(total) 15 6 0 50 15 0 ND 104 86-132 4 20 <br /> Surrogate Dibromofluoromethane 5 59 S 00 112 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 S 24 Soo 105 74-135 <br /> Surrogate Toluene-d8 4 77 S 00 95 84-119 <br /> Surrogate 4-Bromofluorobenzene S 04 500 101-86-119— <br /> Sequoia Analytical-Morgan HAI 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 in its entirety <br /> Page 20 of 30 <br />