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1455 McDowell Blvd,North Ste D <br /> y Sequoia Pte(mCA 94954 <br /> 1865 <br /> Analytical FAX(707)792-0342 <br /> www segitotalabs coin <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrrm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 59 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Resutt Limit Units Level Result %REC Limns RPD Limit Motes <br /> Batch 3100164-EPA 5030 waters <br /> Matrix Spike(3100164-MSI) Source P309471-09 Prepared&Analyzed 10/07/03 <br /> Ten-amyl methyl ether 438 10 ugll 500 ND 88 70-116 <br /> Benzene 5 49 050 " 500 032 103 81-118 <br /> Ten-butyl alcohol 114 20 " 100 19 95 62-142 <br /> Di-isopropyl ether 455 10 " 500 ND 91 71-121 <br /> Ethanol 163 100 " I00 ND 163 65-135 Q-LIM <br /> Ethylbenzene 554 050 1500 Oil 109 89-122 <br /> Ethyl tert-butyl ether 436 10 500 ND 87 71-110 <br /> Methyl tert-butyl ether 126 050 500 87 78 77-123 <br /> Toluene 528 050 500 ND 106 84-119 <br /> Xylenes(total) 162 050 1150 029 106 86-132 <br /> Surrogate Dibromofluoromethane 442 1450 98 84-111 <br /> Surrogate 11 Dtchloroethane-d4 393 1450 87 74-135 <br /> Ourrogale Toluene-d8 467 1450 104 84-119 <br /> Matrix Spike Dup(3100164-MSD1) Source P309471-09 Prepared 10/07/03 Analyzed 10/08/03 <br /> Ten-amyl methyl ether 444 10 ug/l 500 ND 89 70-116 1 20 <br /> Benzene 548 050 500 032 103 81-118 02 20 <br /> Tert-butyl alcohol 128 20 100 19 109 62-142 12 20 <br /> Di isopropyl ether 456 10 500 ND 91 71-121 02 20 <br /> Ethanol 175 100 100 ND 175 65-135 7 20 Q LIM <br /> Ethylbenzene 543 050 Soo Oil 106 89-122 2 20 <br /> Ethyl ten-butyl ether 442 10 500 ND 88 71-110 1 20 <br /> Methyl ten-butyl ether 129 050 500 87 84 77-123 2 20 <br /> Toluene 529 050 500 ND 106 84-119 0 20 <br /> Xylenes(total) 159 050 150 029 104 86-132 2 20 <br /> Surrogate Dibromofluoromethane 451 450 100 84-122 <br /> Surrogate 12 Dtchloroethane-d4 402 450 89 74-135 <br /> Surrogate Toluene-d8 466 450 104 84-119 <br /> Sequoia Analytical-Petaluma 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 27 of 30 <br />