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five <br /> #" "� 885 Jarvis 1 <br /> Sequoia MorganHdl CA 950375037 <br /> ��► Analytical {498)7769300 <br /> FAX(aos)78 3308 <br /> • www sequaiatabs com <br /> i <br /> Secor-Rancho Cordova(ARCO) Project ARCO 94932,Stockton,CA MNA0375 <br /> 3017 Kilgore Rd Suite 100 Protect Number 38984 Reported <br /> Rancho Cordova CA,95670 Protect 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 4010389-EPA 5030B waters <br /> Matrix Spike 4010389-MS1 Source P401264-04 Prepared&Analyzed 01/21/04 <br /> Matrix S ike Du (4010389-MSD1) Source P401264-04 Prepared&Analyzed 01/21/04 <br /> Tert-amyl methyl ether 550 1 0 ugll 500 1 3 84 78-117 4 20 <br /> Benzene 5 80 050 500 1 5 86 81-118 6 20 <br /> Tert-butyl alcohol 100 20 100 ND 100 60 147 3 20 <br /> Di-isopropyl ether 439 1 0 500 ND 88 70-125 5 20 <br /> 1,2-Dibromoethane(EDB) 4 97 0 50 5 00 ND 99 85-125 8 20 <br /> 1,2-Dichloroethane 4 83 050 500 ND 97 77-126 5 20 <br /> Ethanol 93 9 100 100 ND 94 55-200 7 20 <br /> Ethylbenzene 5 29 050 500 0 22 101 89-122 6 20 <br /> Ethyl tert-butyl ether 4 26 1 0 5 00 ND 85 71-120 4 20 <br /> Methyl tert-butyl ether 14 6 0 50 5 00 11 72 70-122 0 7 20 <br /> Toluene 5 37 0 50 500 068 94 84-119 4 20 <br /> Xylenes(total) 16 1 050 15 0 062 103 86-132 4 20 <br /> Surrogate Dibromofluoromeihane S 09 S 00 102 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 83 500 97 74-135 <br /> Surrogate Toluene-d8 4 60 Soo 92 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 80 5 00 96 86-119 <br /> Batch 4010397-EPA 5030E waters <br /> Blank(4010397-BLKi) Prepared&Analyzed 01/21/04 <br /> 1,2-Dlchlorobenzene ND 050 ug/I <br /> 1,3-Dlchlorobenzene ND 0 50 " <br /> 1,4-Dichlorobcnzene ND 0 50 <br /> Chlorobenzene ND 050 " <br /> Tert-amyl methyl ether ND 1 0 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Dt-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert butyl ether ND 1 0 " <br /> Methyl tent-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <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 25 of 30 <br />