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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)77b 9600 <br /> 1%W Analytical <br /> seq Analytical aZ 6309 <br /> www equoioi0labs coin <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco 92133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 03/31/06 14 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyle Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6CO9034- EPA 5030B PIT/EPA 8260B <br /> Blank(6C09034-BLK1) Prepared 03/09/06 Analyzed 03/10/06 <br /> tert-Amyl methyl ether ND 050 Lig/1 <br /> Benzene ND 0 50 " <br /> tent Butyl alcohol ND 20 " <br /> C.hlorobenzene ND 0 50 " <br /> Di-Isopropyl other ND <br />—I 2-Dibromoethane(EDB) ND_ 0 50 " <br /> l 2 Dichlorobenzene ND 0 50 " <br />.1,3 Dichlorobenzene - - -- - --- - — ND 0 50 ---"— - - — - - - <br /> 1,4-Dichlorobenzene ND 0 50 <br /> 1,2 Dichloroethane ND 0 50 " <br /> Ethanol ND 300 " <br /> Ethyl tert-butyl ether ND 050 • <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Sun ogale 1 2-Dichloroerhane-d4 261 250 104 60-135 <br /> Surrogate 4-Bromofluorobenzene 211 250 84 70-120 <br /> Surrogate Dibromofluoromethane 2 73 250 109 65-130 <br /> Surrogate Toluene-d8 245 2 50 98 70-120 <br /> Laboratory Control Sample(6C09034-BSI) Prepared 03/09/06 Analyzed 03/10/06 <br /> Chlorobenzene 106 050 ugA 100 106 80-120 <br /> l,2 Dichlorobenzene 101 050 100 101 80-125 <br /> l 3 Dichlorobenzene 104 050 100 104 75-120 <br /> 1 4 Dichlorobenzene 987 050 IQ 0 99 75-120 <br /> Surrogate l 2-Dichloroeihane-d4 243 250 97 60-135 <br /> Surrogate 4-Bromofluorobenzene 252 2 50 101 70-120 <br /> Sun ogaie Drbromofluoromethane 265 oo250 106 65-130 <br /> Sw r ogaie Toluene-d8 259 11250 104 70-120 <br /> Sequoia Analytical - Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in as entirety <br /> Page 12 of 20 <br />