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8Jarvis Drive <br /> Sequoia MHi <br /> organ Hill CA 950377 <br /> (408)776-9600 <br /> Analytical (408)782 6308 <br /> wwwww scqequoialabs com <br /> SeCOr-RanchO Cordova(ARCO) Project ARCO 42133, 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 %RFC Limits RPD Limit Notes <br /> Batch 6C10044- EPA 5035/EPA 8260B <br /> Laboratory Control Sample(6C10044-BS2) Prepared 03/10/06 Analyzed 03/11/06 <br /> Ethylbenzene 000771 00050 mg/kg 000728 106 80-135 <br /> Methyl tert-butyl ether 000851 00050 000784 109 75-115 <br /> Toluene 00405 00050 00380 107 85-125 <br /> Xylenes(total) 00402 00050 00408 99 80-140 <br /> Gasoline Range Organics(C4-C12) 0412 010 0440 94 53-126 <br /> Surrogate 12-Dichloroelhane-d4 000460 000500 92 60-12S <br /> Laboratory Control Sample Dup(6C10044-BSD1) Prepared 03/10/06 Analyzed 03/11/06 <br /> Chlorobenzene 00105 00050 mglkg 00100 105 85-130 09 25 <br /> 1 2-Dichlorobenzene 00107 00050 00100 107 80-145 09 25 <br /> 1,3 Dichlorobenzene 00104 00050 00100 104 80-130 2 25 <br /> Dichlorobenzene 00103 00050 00100 103 80-135 1 20 <br /> iqlWguie 4-Bromofluorobencene 000522 000500 104 75-120 <br /> Laboratory Control Sample Dup(6C10044-BSD2) Prepared 03/10/06 Analyzed 03/11/06 <br /> Cert Amyl methyl ether 00180 00050 mglkg 00163 110 80-130 6 25 <br /> Benzene 000575 00050 000504 114 65-125 6 20 <br /> tert-Butyl alcohol 0164 0020 0169 97 80-165 Il 25 <br /> Di-isopropyl ether 00154 00050 00162 95 85-115 5 20 <br /> 1,2-Dibromoethane(EDB) 00170 00050 00166 102 85-130 7 15 <br /> 1 2-Dichloroethane 00177 00050 00155 114 63-124 5 25 <br /> Ethanol 0159 010 0165 96 35-150 1 40 <br /> Ethyl tent butyl ether 00165 00050 00164 101 80-125 6 25 <br /> Ethylbenzene 000811 00050 000729 111 80-135 5 20 <br /> Methyl tert-butyl ether 000909 00050 000784 116 75-115 7 35 HL <br /> toluene 00437 00050 00380 115 85-125 8 15 <br /> Xylenes(total) 00430 00050 00408 105 80-140 7 20 <br /> Gasoline Range Organics(C4-C]2) 0 463 010 0 440 105 53-126 12 25 <br /> Stu t ogate 1 1-Drchloroethane-d4 000455 000500 91 60-115 <br /> 40 quota Analytical - Morgan Hill The results to 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 its entirety <br /> Page 14 of 20 <br />