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885 Jarvis Dr <br /> Sequoia <br /> Morgan Hill CA 45037 <br /> (408)776 9600 <br /> Analytical wwseq(408)782-6308 <br /> om <br /> www sequowlabs coin <br /> i <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0370 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 09 33 <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 %REC Limits RPD Limit Motes <br /> Batch 4G17001-EPA 5030B P/T <br /> Blank(4G17001-BLK1) Prepared&Analyzed 07/17/04 <br /> tert-Amyl methyl ether ND 050 ugll <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> I 2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichlorocthane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethyl Cert butyl ether ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> dGylenes(total) ND 050 <br /> asoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 12 Dichloroethane-d4 458 5 00 92 78-129 <br /> Laboratory Control Sample(4G17001-13S1) Prepared&Analyzed 07/17/04 <br /> tert-Amyl methyl ether 927 0 50 ugil 10 0 93 82-140 <br /> Benzene 921 050 100 92 69-124 <br /> tert-Butyl alcohol 464 20 500 93 56-131 <br /> Di-isopropyl ether 10 6 0 50 10 0 106 76-130 <br /> 1,2-Dibromoethane(EDB) 10 9 0 50 10 0 109 77-132 <br /> 1 2-Dichloroethane 9 86 050 100 99 77-136 <br /> Ethanol 205 100 200 102 31-143 <br /> Ethyl tent-butyl ether 9 54 050 10 0 95 81-121 <br /> Ethylbenzene 108 0 50 10 0 108 84-132 <br /> Methyl tort-butyl ether 865 0 50 10 0 86 63-137 <br /> Toluene 975 0 50 100 98 78-129 <br /> Xylenes(total) 34 2 0 50 300 114 83-137 <br /> Surrogate 12 Dichloroethane-d4 468 5 00 94 78-129 <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 its entirety <br /> Page 5 of 11 <br />