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1455 McDowell Blvd North Ste D <br /> e[I1101`d PetalaCA 94954 <br /> (1070 7)792-1665-1865 <br /> � r Analytical u7)792-0342 <br /> www <br /> se quoiatabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Report`s <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source Y.REC RPD <br /> Analyte Result Limit Units Level Result %REC LimItS RPD Limit Notes <br /> Batch 4100058-EPA 5030B waters 1 EPA 8260B <br /> Matnx Spike{4100058-MS1) Source P409397-18 Prepared&Analyzed 10/04/04 <br /> Tert-amyl methyl ether 24 1 50 ug/I 250 ND 96 78-117 <br /> Benzene 24 5 25 250 029 97 81-118 <br /> Teri-butyl alcohol 462 100 500 ND 92 60-147 <br /> Di-isopropyl ether 230 5 0 250 ND 92 70-125 <br /> 1,2-Dichloroethane 116 25 250 94 88 77-126 <br /> Ethanol 417 500 500 ND 83 55-200 <br /> Ethylbenzene 240 2 5 250 ND 96 89 122 <br /> Ethyl tert-butyl ether 22 2 50 250 ND 89 71-120 <br /> Methyl tert-butyl ether 22 5 25 250 ND 90 70-122 <br /> Toluene 255 25 250 ND 102 84-119 <br /> Xylenes(total) 73 9 2 5 750 ND 99 86-132 <br /> gate Dibromofluoromethane 454 500 91 84-122 <br /> arrogate I 2-Dichloroethane-&4 474 500 95 74-135 <br /> Surrogate Toluene-d8 519 500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 491 500 98 86-119 <br /> Matrix Spike Dup(4100058-MSD1) Source P409397-18 Prepared&Analyzed 10/04/04 <br /> Tert-amyl methyl ether 28 2 5 0 ugA 250 ND 113 78-117 16 20 <br /> Benzene 27 3 25 250 029 108 81-118 11 20 <br /> Tert-butyl alcohol 515 100 500 ND 103 60-147 11 20 <br /> Di-isopropyl ether 275 50 250 ND 110 70-125 18 20 <br /> 1 2-Dichloroethane 130 25 250 94 144 77-126 11 20 LM <br /> Ethanol 455 500 S00 ND 91 55-200 9 20 <br /> Ethylbenzene 275 2 5 250 ND 110 89-122 14 20 <br /> Ethyl tert-butyl ether 267 50 250 ND 107 71 120 18 20 <br /> Methyl tert-butyl ether 268 2 5 250 ND 107 70-122 17 20 <br /> Toluene 28 9 2 5 " 250 ND 116 84-119 12 20 <br /> Xylenes(total) 83 9 2 5 750 ND 112 86-132 13 20 <br /> Surrogate Dibroinofluoromethane 503 500 101 84-121 <br /> Surrogate 1,2-Dichloroethane d4 499 500 100 74-135 <br /> Surrogate Toluene-d8 550 500 110 84-119 <br /> Surrogate 4-Bromofluorobenzene 510 500 104 86-119 <br /> I <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 28 of 29 <br />