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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> & (707) <br /> Analytical 792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Prosect Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G097z-0164 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 04/14/05 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source O/"REC RPD <br /> Analyte Result limit Units Level Result °/.REC limits RPD lamit Notes <br /> Batch 5040103-EPA 5030B waters 1 EPA 8260B <br /> i <br /> Matrix Spike(5040103-MSI) Source P504013-03 Prepared 04/12/05 Analyzed 04/13/05 <br /> Tert-amyl methyl ether 491 10 ugA 500 ND 98 78 117 <br /> Benzene 560 050 Soo ND 112 81-118 <br /> 'Pert-butyl alcohol 101 20 100 ND lot 60-147 <br /> Di-isopropyl ether 567 10 Soo ND 113 70-125 <br /> I <br /> 1,2-Dibromoethane(EDB) 526 050 Soo ND 105 85-125 <br /> 1,2-Dichloroethane 529 050 5 00 ND 106 77-126 <br /> Ethanol 129 100 loo 280 NR 55-200 LN <br /> Ethylbenzene 563 050 " 500 ND 113 89-122 <br /> Ethyl ter(-butyl ether 499 10 500 ND 100 71 120 <br /> Methyl tert-butyl ether 508 050 500 ND 102 70-122 <br /> Toluene 564 050 500 ND 113 84-119 <br /> dmkXylenes(total) 167 050 150 ND 111 86-132 <br /> urrogate Dibromafluoromethane 512 5 00 102 84-122 <br /> Surrogate 1 1-Dichloroethane-d4 458 5 00 92 74 135 <br /> Surrogate Toluene-d8 503 500 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 551 Soo 110 86-119 <br /> Matrix Spike Dup(5040103-MSDI) Source P504013-03 Prepared 04/12/05 Analyzed 04/13/05 <br /> Tert-amyl methyl ether 475 10 ug/l 5 00 ND 95 78-117 3 20 <br /> Benzene 548 0 50 " 500 ND 110 81-118 2 20 <br /> Tert-butyl alcohol 121 20 " 100 ND 121 60-147 18 20 <br /> Di-isopropyl ether 542 10 5 00 ND 108 70-125 5 20 <br /> 12 Dibromoethane(EDB) 508 050 500 ND 102 85-125 3 20 <br /> 1 2 Dichloroethane 5 17 050 5 00 ND 103 77-126 2 20 <br /> Ethanol 131 100 100 280 NR 55-200 2 20 LN <br /> Ethylbenzene 565 050 500 ND 113 89-122 04 20 <br /> Ethyl Cert butyl ether 486 10 500 ND 97 71-120 3 20 <br /> Methyl tert-butyl ether 491 050 500 ND 98 70-122 3 20 <br /> Toluene 5 53 050 500 ND 111 84-119 2 20 <br /> Xylenes(total) 167 050 15 0 ND 1 1 1 86-132 0 20 <br /> Surrogate Dibromofluoromethane 498 500 100 84-121 <br /> Surrogate 1 2-Dichloroethane-d4 446 500 89 74-135 <br /> Surrogate Toluene-d8 510 5 00 102 84 119 <br /> Surrogate 4-Bromofluorobenzene 532 5 00 106 86-119 <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 15 of 20 <br />