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SSS Jarvis,CA1)037 <br /> Sequoia Morgan{4LL 08)776 <br /> a9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoiaSa65 to <br /> Secer-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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010373-EPA 5030B waters <br /> Laboratog Control Sample 4010373-BS1Prepared&Analyzed 01/21/04 <br /> Surrogate Toluene d8 653 ug/1 600 109 84-119 <br /> Surrogate 4-Bromofluorobenzene 620 600 103 86-119 <br /> Laboratory Control Sample Dup{4010373-BSDI) Prepared&Analyzed 01/21/04 _ <br /> Tert-amyl methyl ether 5 11 1 0 ugA 500 102 78-117 2 20 <br /> Benzene 522 0 50 500 104 81-118 3 20 <br /> Tert-butyl alcohol 112 20 100 112 60-147 7 20 <br /> Di-isopropyl ether 5 40 1 0 5 00 108 70-125 5 20 <br /> 1,2-Dibromoethane(EDB) 479 0 50 500 96 85-125 6 20 <br /> 1,2-Dichloroethane 4 77 050 5 00 95 77-126 0 6 20 <br /> Ethanol 108 100 100 108 55-200 15 20 <br /> Ethylbenzene 5 26 050 Soo 105 89-122 3 20 <br /> Ethyl tert-butyl ether 474 1 0 500 95 71-120 3 20 <br /> Methyl tert-butyl ether 4 86 0 50 5 00 97 70-122 0 8 20 <br /> Toluene 474 050 500 95 84-119 0 2 20 <br /> Xylenes(total) 16 1 0 50 15 0 107 86-132 5 20 <br /> Surrogate DtbromoJluoromethane 632 600 105 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 6 10 6 00 102 74-135 <br /> Surrogate Toluene-d8 6 71 6 00 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 626 600 104 86-119 <br /> Batch 4010378-EPA 5030B waters <br /> Blank 4010378-BLKI Pre ared&Anal zed 01/21/04 <br /> Benzene ND 050 1194 <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dlbromof7uoromethane 437 4 50 97 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 3 92 4 50 87 74-135 <br /> Surrogate Toluene-4`8 454 4 50 101 84-119 <br /> Sequoia Analytical-Morgan Hill The results to 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 welghto <br /> basis This analytical report must be reproduced In its entirety <br /> Page 22 of 30 <br />