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885Ia Drive Morgan Hit] CAA 95037 <br /> (406)776 9600 <br /> FAX 08 <br /> Analytical wwseg8ialabs corn www sequorelabs 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 Level Result %REC Limits RPD Limit Notes <br /> Batch 4G22001 -PPA 5030B PIT <br /> Matrix Spike Drip(4G22001-MSDI) Source MNG0318-02 Prepared&Analyzed 07/22/04 <br /> Benzene 905 50 ug/l 640 380 82 78 124 1 12 <br /> Ethylbenzene 2440 50 696 2100 49 84 117 2 10 LN <br /> Methyl tert-butyl ether 5950 50 992 5800 15 63 137 12 13 LN <br /> Toluene 3160 50 2970 24 106 78-129 2 10 <br /> Xylenes(total) 10300 50 3370 7900 71 83-125 1 11 LN <br /> Gasoline Range Organics(C4-C 12) 82000 5000 44000 59000 52 70-124 1 20 LM <br /> Surrogate 12-Dichloroethane-d4 227 2 50 91 78-119 <br /> Batch 4G23004-EPA 5030B PIT <br /> Blank(4G23004-BLKI) Prepared&Analyzed 07/23/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 • <br /> tert-Butyl alcohol ND 20 " <br /> Di-tsopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Drchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 030 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 12-Drchloroethane-d4 131 150 93 78-119 <br /> Laboratory Control Sample(4G23004-BSI) Prepared&Analyzed 07/23/04 <br /> tert-Amyl methyl ether 102 050 ug/l 100 102 56-140 <br /> Benzene 934 050 100 93 78-124 <br /> tert-Butyl alcohol 71 7 20 500 143 0-206 <br /> Di-isopropyl ether 999 050 100 100 76-130 <br /> 1,2 Dlbroinoethane(EDB) 101 050 100 101 77-132 <br /> 1,2-Drchloroethane 986 050 10 0 99 77-136 <br /> Ethanol 288 100 200 144 31-186 IC <br /> Ethyl tert-butyl ether 990 0 50 100 99 61-141 <br /> Ethylbenzene 101 050 100 101 84-117 <br /> Methyl tert-butyl ether 9 53 050 100 95 63-137 <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 19 of 24 <br />