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885 Jarvis Drive <br /> Sequoia Morganill CA 95037 <br /> (408)776-9640 <br /> 'W Analytical FAX(409)7112-6 <br /> FAX <br /> sequpialahs cam <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO261 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/04/06 13 28 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result °/nREC Limits RPD Limit Notes <br /> Batch 601005-EPA 5035/EPA 8260B <br /> Blank(6C11005-BLK1) Prepared 03/11/06 Analyzed 03/12/06 <br /> tert-Amyl methyl ether ND 00050 mglkg <br /> Benzene ND 00050 " <br /> tert-Butyl alcohol ND 0 020 " <br /> Di-isopropyl ether ND 00050 " <br /> 1 2 Dibromoethane(EDB) ND 00050 " <br />=1,2-Dichloroethane ND 00050 " <br /> Ethanol ND 010 " <br /> Ethyl tent-butyl ether -- — -- -- - --!— -ND—0 0050 T —"-- —-- ---- T- - - - - -- - - --- - - <br /> Ethy Ibenzene ND 00050 PE <br /> Methyl tert butyl ether ND 00050 " <br /> oluene ND 00050 " <br /> Xylenes(total) ND 00050 <br /> Ga5olme Range Organics(C4-C 12) ND 010 " <br /> Surrogate 1 2-Dichloroethane-0 _ 000470 _ 000500 94 60-125 <br /> Laboratory Control Sample(6C11005-BS1) Prepared 03/11/06 Analyzed 03/12/06 <br /> lert-Amyl methyl ether 00111 00050 mg/kg 00100 111 80-130 <br /> Benzene 00114 00050 00100 114 65-125 <br /> tert-Butyl alcohol 0 220 0 020 0200 110 80-165 <br /> Di isopropyl ether 00110 00050 00100 110 85-115 <br /> 1 2 Dibromoethane(EDB) 00109 00050 00100 109 85-130 <br /> 1 2 Dichloroethane 00126 00050 00100 126 63-124 HL <br /> Ethanol 0 306 010 " 0200 153 35-150 HL <br /> Ethyl tort butyl ether 00106 00050 00100 106 80-125 <br /> Ethylbenzene 00115 00050 00100 115 80-135 PE <br /> Methyl tert butyl ether 00106 00050 00100 106 75-115 <br /> f oluene 00124 00050 00100 124 85-125 <br /> Xylenes(total) 00345 00050 00300 115 80-140 <br /> Sul i ogate 1 2-Dichloroethane-0 000479 000500 96 60-125 <br /> Sequoia Analytical- Morgan Hill The results in this report apply to the samples analysed in accordance with the chain oJ'� <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 20 <br />