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ass 15 Dr <br /> Sequoia Morgan Hill CAA 9 95037 <br /> (408)776 9600 <br /> FAX 782 6308 <br /> Analytical www scquoiuoialabs corn <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,95 67 0 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 %bREC RPD <br /> Analyte Result Limit Units Level Result °/.REC Limits RPD Limit Notes <br /> Batch 4G17001-EPA 5030B PIT <br /> Matrix Spike Dup(4G17001-MSD1) Source MNG0241-09 Prepared 07/17/04 Analyzed 07/18/04 <br /> Benzene 240 25 ug/l 320 ND 75 69-124 3 20 <br /> Ethylbenzene 364 25 348 ND 105 84-132 4 20 <br /> Methyl ter(-butyl ether 1060 25 496 590 95 63-137 6 20 <br /> Toluene 1470 25 1480 ND 99 78-129 l 20 <br /> Xylenes(total) 1810 25 1680 ND 108 83-137 5 20 <br /> Gasoline Range Organics(C4-C 12) 20800 2500 22000 ND 95 70-124 4 20 <br /> Surrogate 12 Dichloroethane-d4 4 81 500 96 78 119 <br /> Batch 4G19006-EPA 5030E PIT <br /> Blank(4G19006-BLK1) Prepared&Analyzed 07/19/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> .cnzene ND 050 <br /> tert Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 " <br /> 1,2 Dibromoethane(EDB) ND 050 " <br /> 12-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate I 1-Dichloroethane-d4 492 5 00 98 78-119 <br /> Laboratory Control Sample(4G19006-BSI) Prepared&Analyzed 07/19/04 <br /> tert-Amyl methyl ether 948 050 ug/l 100 95 82-140 <br /> Benzene 890 050 100 89 69-124 <br /> tert-Butyl alcohol 515 20 Soo 103 56-131 <br /> Di-isopropyl ether 107 050 100 107 76-130 <br /> 1,2-Dibromoethane(EDB) 113 050 " 100 113 77-132 <br /> 1,2-Dichloroethane 108 050 100 108 77-136 <br /> Ethanol 202 100 200 101 31-143 <br /> Ethyl tert-butyl ether 993 050 " 100 99 81-121 <br /> Ethylbenzene 103 0 50 100 103 84-132 <br /> Methyl tert butyl ether 916 0 50 100 92 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 7 of 11 <br />