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885 Janis Dr <br /> \ Se uoia Morgan Hill C95037 <br /> h�-�� q (408)7776 9604 <br /> �qw Analytical wwse08)782-born <br /> www sequoiafahs con <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595, Stockton,CA MNG0109 <br /> 3017 Kilgore Rd Suite 100 Project Number 62546 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 20 24 <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 4G16005-EPA 5030B Pfr <br /> Blank(4G16005-BLK1) Prepared&Analyzed 07/16/04 <br /> Ethylbenzene ND 050 ug/1 <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-Cl2) ND 50 " <br /> Surrogate 1,2-Dtchloroethane-d4 478 500 96 78-129 <br /> Laboratory Control Sample 4G16005-BSI) Prepared&Analyzed 07/16/04 <br /> tert-Amyl methyl ether 209 050 u84 200 104 82-140 <br /> Benzene 178 050 " 20 0 89 69-124 <br /> tert-Butyl alcohol 113 so 100 113 56-131 <br /> i-isopropyl ether 209 050 n 200 104 76-130 <br /> 1 -Dibromoethane(EAS) 235 050 200 118 77-132 <br /> 1,2-Dichloroethane 209 050 200 104 77-136 <br /> Ethanol 407 100 400 102 31-143 <br /> Ethyl tert-butyl ether 20 4 050 200 102 81-121 <br /> Ethylbenzene 234 050 200 117 84-132 <br /> Methyl tert-butyl ether 165 050 200 82 63-137 <br /> Toluene 198 050 200 99 78-129 <br /> Xylenes(total) 718 050 600 120 83-137 <br /> Surrogate 1 2-Dtchloroethane-d4 515 " 500 103 78-129 <br /> Laboratory Control Sample(4Gi6005-BS2) Prepared&Analyzed 07/16/04 <br /> Gasoline Range Organics(C4-C12) 486 50 ug/l 440 110 70-124 <br /> Surrogate 1 2-Dtchloroethane-d4 525 Soo 105 78-129 <br /> Laboratory Control Sample Dup(44316005-11SD1) Prepared&Analyzed 07/16/04 <br /> tert-Amyl methyl ether 19 1 050 ug/I 200 96 82-140 9 20 <br /> Benzene 176 050 200 88 69-124 1 20 <br /> tert-Butyl alcohol 978 5 0 100 98 56-131 la 20 <br /> Di-isopropyl ether 20 1 050 200 100 76-130 4 20 <br /> 1 2-Dibromoethane(EDB) 206 050 200 103 77-132 13 20 <br /> 1,2-Dtchloroethane 192 050 200 96 77-136 8 20 <br /> Ethanol 353 100 400 88 31-143 14 20 <br /> Ethyl tert butyl ether 19 5 0 50 200 98 81-121 5 20 <br /> Ethylbenzene 21 0 0 50 200 105 84-132 11 20 <br /> Methyl tert-butyl ether 166 050 1 -200 83 63-137 0 6 20 <br /> .Sequoia Analytical -Morgan Hill The results rn this report apply to the samples analyzed to accordance weth the chain of <br /> ceutady document Unless athenwse stated results are reported on a wet weigh!basis <br /> This analytical report must be reproduced in its entirety <br /> Page 18 of 21 <br />