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Drive <br /> i Hi Jarvis 5037 <br /> ` Sequoia MorganSi3l CA 95437 <br /> (408)776-9600 <br /> FAX Analytical wwseq 8ialabs 308 <br /> www sequosalabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932, Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <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 Leve] Result %REC Limits RPD Limit Notes <br /> Batch 4G23004-LPA 50308 P/T <br /> Laboratory Control Sample(4G23004-BSI) Prepared&Analyzed 07/23/04 <br /> Toluene 961 050 ug/I 100 96 78-129 <br /> Xylenes(total) 31 0 050 300 103 83-125 <br /> Surrogate I 1-Dichloraethane d4 219 2 50 88 78-129 <br /> Laboratory Control Sample(4G23004-BS2) Prepared&Analyzed 07/23/04 <br /> Benzene 546 050 ug/l 640 85 78-124 <br /> Ethylbenzene 793 050 696 114 84-117 <br /> Methyl tert-butyl ether 872 050 992 88 63-137 <br /> Toluene 31 3 050 297 105 78-129 <br /> Xylenes(total) 395 050 337 117 83-125 <br /> Gasoline Range Organics(C4-C12) 445 50 440 101 70-124 <br /> Wrrogate 12-Dichloraethane-d4 213 2 50 89 78-129 <br /> boratory Control Sample Dup(4G23004-BSDI) Prepared&Analyzed 07/23/04 <br /> tert Amyl methyl ether 980 050 ug/l 100 98 56-140 4 12 <br /> Benzene 937 050 100 94 78-124 0 3 12 <br /> tert-Butyl alcohol 917 20 50 0 183 0-206 24 22 RB <br /> Di-isopropyl ether 100 050 100 100 76-130 0 1 9 <br /> 1,2 Dibromoethane(EDB) 980 0 50 100 98 77-132 3 9 <br /> 1,2-Dichloraethane 10 1 050 100 101 77-136 2 13 <br /> Ethanol 375 100 200 188 31-186 26 37 IC,HL <br /> Ethyl tert-butyl ether 9 89 0 50 100 99 61-141 0 1 9 <br /> Ethylbenzene 100 0 50 100 100 84-117 1 10 <br /> Methyl tert butyl ether 842 050 100 84 63-137 12 13 <br /> Toluene 946 0 50 100 95 78-129 2 10 <br /> Xylenes(total) 305 050 300 102 63-125 2 11 <br /> Surrogate 1,2-Dichloroethane-d4 207 250 83 78-129 <br /> equota 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 20 of 24 <br />