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Sequoia 1455 McDowell Petaluma,CA <br /> �■`"�� Pea,CA 949544 <br /> (707)792 1865 <br /> FAX Analytical wwsequ7) labsco2 <br /> wwry sequoialabs coni <br /> URS Corp-Sacramento Project Arco Site 760,Loch,CA P410096 <br /> 2870 Gateway Oaks Drive Suite 300 Prosect Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/20/04 17 30 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPI) Limit Notes <br /> Batch 4100375-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4100375-MS1) Source P410131-01 Prepared&Analyzed 10/15/04 <br /> Teri-amyl methyl ether 5 10 to ug/] 500 ND 102 78-117 <br /> Benzene 499 050 500 0 055 99 81-118 <br /> Tert-butyl alcohol 113 20 100 ND 113 60-147 <br /> Di-isopropyl ether 493 10 500 ND 99 70-125 <br /> 1,2-Dibromoethane(EDB) 538 050 500 ND 108 85-125 <br /> l 2-Dichloroethane 498 050 500 ND 100 77-126 <br /> Ethanol 980 100 100 ND 98 55-200 <br /> Ethylbenzene 5 41 050 500 ND 108 89-122 <br /> Ethyl tert-butyl ether 5 02 IQ 500 ND 100 71-120 <br /> Methyl tert-butyl ether 523 050 500 ND 105 70-122 <br /> Toluene 575 050 Soo 042 107 84-119 <br /> A�ylcnes(total) 16 3 050 150 ND 109 86-132 <br /> arrogate Dibromofluoromethane 540 500 108 84-122 <br /> Surrogate 12-Dichloroeihane-d4 511 500 102 74-135 <br /> Surrogate Toluene-d8 557 500 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 555 500 111 86-119 <br /> Matnx Spike Dup(4100375-MSD1) Source P410131-01 Prepared&Analyzed 10/15/04 <br /> Tert-amyl methyl ether 524 1 0 ug/I 500 ND 105 78-117 3 20 <br /> Benzene 5 14 050 Soo 0 055 102 81-118 3 20 <br /> Tert-butyl alcohol 112 20 100 ND 112 60-147 0 9 20 <br /> Di-isopropyl ether 500 10 500 ND 100 70-125 1 20 <br /> 1 2-Dibromoethane(EDB) 540 050 500 ND 108 85-125 0 4 20 <br /> 1,2-Dichloroethane 5 03 050 Soo ND t0] 77-126 1 20 <br /> Ethanol 102 100 100 ND 102 55-200 4 20 <br /> Ethylbenzene 545 050 500 ND 109 89-122 0 7 20 <br /> Ethyl tert-butyl ether 5 00 1 0 500 ND 100 71-120 0 4 20 <br /> Methyl tert-butyl ether 522 050 500 ND 104 70-122 0 2 20 <br /> Toluene 584 050 500 042 108 84-119 2 20 <br /> Xylenes(total) 166 0 50 150 ND 111 86-132 2 20 <br /> Surrogate Dibromofluoromethane .521 5 00 104 84-121 <br /> Surrogate 1 2-Dichloroethane-d4 Soo 500 100 74-135 <br /> Surrogate Toluene-d8 540 500 108 84-119 <br /> Surrogate 4-Bromofluorobenzene 567 500 113 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 10 of 11 <br />