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A <br /> a— ) (71455 McDowell13)vd North Ste <br /> Sequoia Petaluma,CA94954 <br /> Analytical FAX <br /> 07)7921845 <br /> (707)792-0342 <br /> www sequoialabs cam <br /> • <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 10 17 <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 RPD Lu it Notes <br /> Batch 4030532-EPA 5030B waters <br /> Matrix Spike(4030532-MSI) Source P403188-01 Prepared&Analyzed 03/19/04 <br /> Tert-amyl methyl ether 543 10 ug/1 500 ND 109 78-117 <br /> Benzene 564 050 500 063 100 81-118 <br /> Tert-butyl alcohol 127 20 100 16 111 60-147 <br /> Di-isopropyl ether 500 10 500 ND 100 70-125 <br /> 1,2-Dibromoethane(EDB) 566 050 500 ND 113 85-125 <br /> 1,2-Dichloroethane 662 050 500 1 3 106 77-126 <br /> Ethanol 986 100 100 ND 99 55-200 <br /> Etbylbenzene 106 050 500 59 94 89-122 <br /> Ethyl tent-butyl ether 5 15 10 500 ND 103 71-120 <br /> Methyl tert-butyl ether 237 050 500 19 94 70-122 <br /> Toluene 563 050 500 013 110 84-119 <br /> ylenes(total) 459 050 150 33 86 86-132 <br /> rrogate Dibromofluoromethane 512 500 101 84-122 <br /> Surrogate 12-Dichloroethane-d4 489 500 98 74-135 <br /> Surrogate Toluene-d8 520 Soo 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 566 500 113 86-119 <br /> Matrix Spike Dup(4030532-MSDI) Source P403188-01 Prepared&Analyzed 03/19/04 <br /> Tert-amyl methyl ether 5 I 1 10 ugA 500 ND 102 78-117 6 20 <br /> Benzene 534 050 500 063 94 81-118 5 20 <br /> Tert-butyl alcohol 131 20 100 16 115 60-147 3 20 <br /> Di-isopropyl ether 481 1 0 500 ND 96 70-125 4 20 <br /> 1,2-Dibromoethane(EDB) 551 050 500 ND 110 85-125 3 20 <br /> 1,2-Dichloroethane 630 050 500 1 3 100 77-126 5 20 <br /> Ethanol 932 100 100 ND 93 55-200 6 20 <br /> Ethylbenzene 106 050 500 59 94 89-122 0 20 <br /> Ethyl tert-butyl ether 491 10 500 AID 98 71-120 5 20 <br /> Methyl tert-butyl ether 224 050 500 19 68 70-122 6 20 QCO2 <br /> Toluene 541 050 500 013 106 84-119 4 20 <br /> Xylenes(total) 450 050 150 33 80 86-132 2 20 QCO2 <br /> Surrogate Dibromofluoromeihane 501 500 100 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 489 500 98 74-135 <br /> Surrogate Toluene-d8 516 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 587 500 117 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 /> 10 This analytical report must be reproduced in its entirety <br /> Page 28 of 34 <br />