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885 Jarvis Drive <br /> Hill CA 95037 <br /> 4DSequoia Morgan(409)776-9600 <br /> 08 <br /> qW Analytical wwsegFAX 8ialabs om <br /> www sequoialabs coni <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO246 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/11/06 09 55 <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 %RFC Limits RPD Limit Notes <br /> Batch 6C11005-EPA 50351 EPA 8260B <br /> Laboratory Control Sample Dup(601005-13S131) Prepared 03/11/06 Analyzed 03/12/06 <br /> tert-Amyl methyl ether 00111 00050 mg/kg 00100 111 80-130 0 25 <br /> Benzene 00114 00050 00100 114 65-125 0 20 <br /> tert Butyl alcohol 0 236 0 020 0200 118 80-165 7 25 <br /> Di-isopropyl ether-- 00110 00050 00100 110 85-115 0 20 ` <br /> I 2-Dibromoethane(EDB) K 0 O1D9 0 060 0 0100 f - '109 -85-130 - —0- _`-15 - —" - - <br />.I 2-Dichloroethane 00126 0 0050 00100 126 63-124 0 25 HL <br /> Ethanal 0319 010 0200 160 35-150 4 40 IiL " <br />—Ethyl tert-butyl ether _ �0 0106 T� _ 0 0050 --00100-- ` _ 106 80-125 0 25 T <br /> Elhylbenzene 00114 00050 00100 114 80-135 0 9 20 PE <br /> Methyl tert-butyl ether 00102 00050 00100 102 75-115 4 35 <br /> 1 oluene 00122 00050 00100 122 85-125 2 15 <br /> Xylenes(total) 00339 00050 00300 113 80-140 2 20 <br /> Surrogate 1 2-Dichloroethane-d4 000475 000500 95 60-115 <br /> Matrix Spike(6C11005-MSI) Source MPCO075-14REI Prepared 03/11/06 Analyzed 03/12/06 <br /> tert-Amyl methyl ether 00825 0 025 mg/kg 00916 000075 100 80-130 <br /> Benzene 00315 0 025 00252 00055 103 65-125 <br /> teri-Butyl alcohol 0 872 010 0 844 ND 103 80-135 <br /> Di-isopropyl ether 00778 0 025 00812 ND 96 85-115 <br /> 1 2-Dibromoethane(EDB) 00829 0025 00832 ND 100 85-130 <br /> 1 2-Dichloruethane 00883 0 025 00776 ND 114 63-124 <br /> Ethanol 160 050 0 824 ND 194 35-150 HL <br /> Ethyl tert-butyl ether 00782 0 025 00820 ND 95 80-125 <br /> Ethylbenzene 00430 0 025 00364 00084 95 80-135 PE <br /> Methyl tert-butyl ether 00299 0 025 00392 0 013 43 75-115 LN <br /> Toluene 0 210 0 025 0 190 00034 109 85-125 <br /> Xylenes(total) 0 216 0 025 0204 0 012 100 80-140 <br /> Gasolme Range Organics(C4-C12) 13 6 0 50 220 93 195 53-126 BB,LM <br /> Surt ogare 1 2-Dichloroethane-d4 000465 000500 93 60-125 <br /> Sequoia Analytical - Morgan Hill The results in this report apply to the samples analyzed in accordance with the chainof, <br /> custody document Unless otherwise stated results are reported on a wet weight basis is <br /> This analytical report must be reproduced in its entirety <br /> Page 23 of 28 <br />