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8Hi Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> FAX� Analytical www <br /> labsco82 8 <br /> www sequoialabs coin <br /> • <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 /> Analyie Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6C11005- EPA 5035/EPA 8260B <br /> Matrix Spike(6C11005-MS1) Source MPC0075-14RE1 Prepared 03/11/06 Analyzed 03/12/06 <br /> tert-Amyl methyl ether 00825 0 025 mg/kg 00816 000075 100 80-130 <br /> Benzene 00315 0 025 00252 00055 103 65-125 <br /> tert-Butyl alcohol 0 872 0 10 0 844 ND 103 80-135 <br /> Disopropyl ether _ 00779 0 025 - 00812 ND 96 85-115 <br />-- i-I 2-Dibromoethane(EDB)— --� - W - __ 0~0829 --D 025 Y - -0 0832 ND 100 85-130 - <br />_l 2-Dichloroethane 0 0883 0 025 00776 ND 114 63-124 <br /> Ethanol 160 050 0 824 ND 194 35-150 HL <br />=Ethyl tett-butyl ether 0 0782 0 025 -0-0820 ND 95 80-125 - — - - - <br /> Ethylbenzene 00430 0 025 00364 00084 95 80-135 PE <br /> Methyl tort 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 /> Gasoline Range Organics(C4-C12) 13 6 050 2 20 9 3 195 53-126 BB,L� <br /> Surrogate l 2-Dichloroethane-d4 000465 000500 -93 60-125 <br /> Matrix Spike Dup (6C11005-MSDI) Source MPCO075-14RE1 Prepared 03/11/06 Analyzed 03/12/06 <br /> teri-Amyl methyl ether 00839 0 025 mg/kg 00816 000075 102 80-130 2 25 <br /> Benzene 00306 0 025 00252 00055 100 65-125 3 20 <br /> tert-Butyl alcohol 0 877 010 0 844 ND 104 80-135 0 6 20 <br /> Di-isopropyl ether 00773 0 025 00812 ND 95 85-115 06 20 <br /> 1 2-Dibromoethane(EDB) 00862 0 025 00932 ND 104 85-130 4 IS <br /> 1 2 Dich I oroethane 00892 0 025 00776 ND 114 63-124 0 1 25 <br /> Ethanol 1 48 0 50 0 824 ND 180 35-150 8 40 HL <br /> Ethyl teri butyl ether 00790 0 025 00820 ND 96 80-125 1 25 <br /> Ethylbenzene 00416 0 025 00364 00084 91 80-135 3 20 PE <br /> Methyl tert butyl ether 00305 0 025 00392 0 013 45 75-115 2 35 LN <br /> Toluene 0 220 0 025 0 190 00034 114 85-125 5 15 <br /> Xylenes(total) 0 210 0 025 0204 0 012 97 80-140 3 20 <br /> Gasoline Range Organics(C4-C 12) 152 050 220 9 3 268 53-126 11 25 BB,LM <br /> Surrogate l 2-Dichloroethane-d4 000464 000500 93 60-125 <br /> Sequoia Analytical - Morgan Hill The results in this report apply to the samples analy_ed in accordance with the chainof <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 17 of 20 <br />