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' ' � q 885 Jarvis Dave <br /> Sequoia Morgan Hill CA 95037 <br /> Analytical FAX(408)772 9600 <br /> IW (408)782 6308 <br /> www sequaialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#14932,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 /> Volahle Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010378-EPA 5030B waters <br /> Laboratou Control Sample 4010378-BSI) Prepared&Analyzed 01121104_ <br /> Benzene 0 942 050 ugA 1 00 94 81-118 <br /> Ethylbenzene 1 06 0 50 1 00 106 89-122 <br /> Methyl tert-butyl ether 0 875 0 50 1 00 88 77-123 <br /> Toluene 1 01 0 50 1 00 101 84-119 <br /> Xylenes(total) 3 16 050 3 00 105 86-132 <br /> Surrogate Dibromofluoromethane 4 38 " 450 97 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 3 77 450 84 74-135 <br /> Surrogate Toluene-d8 460 4 50 102 84-119 <br /> Laboratory Control Sample Dup(4010378-BSD1) Prepared&Analyzed 01/21/04 <br /> Benzene 0 953 050 ug/l 1 00 95 81-118 1 20 <br /> Ethylbenzene 1 02 0 50 1 00 102 89-122 4 20 <br /> . Methyl tert butyl ether 0 871 0 50 1 00 87 77-123 0 5 20 <br /> Toluene 0 983 050 1 00 98 64 119 3 20 <br /> Xylenes(total) 308 0 50 3 00 103 86-132 3 20 <br /> Surrogate Dibromofluoromethane 4 35 4 50 97 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 3 83 450 85 74-135 <br /> Surrogate Toluene d8 4 59 4 50 102 84-119 <br /> Batch 4010389-EPA 5030B waters <br /> Blank{4010389-BLKI) Prepared&Analyzed 01/21/04 <br /> Tert-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Drchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 534 500 107 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 515 500 103 74-135 <br /> Surrogate Toluene-d8 4 71 500 94 84-119 <br /> Sequoia Analytical-Morgan Hill 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 23 of 30 <br />