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' • 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> FAX(707)792 0342 <br /> Analytical www sequoialabs com <br /> URS Corp-Sacramento Pro3ect Arco Site 6100,Tracy,CA P409117 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/21/04 09 47 <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 Limit Notes <br /> Batch 4090417- EPA 5030B waters <br /> Matrix Spike(4090417-MSI) Source P409117-03 Prepared&Analyzed 09/16/04 <br /> Ten-amyl methyl ether 1170 250 ug/I 1250 ND 94 78-117 <br /> Benzene 9410 120 1250 9000 33 81-118 BB,LN <br /> Tert-butyl alcohol 25100 5000 25000 ND 100 60-147 <br /> Di-isopropyl ether 1200 250 1250 ND 96 70-125 <br /> 1 2-Dibromoethane(EDB) 1360 120 1250 69 103 85-125 <br /> 1,2-Dichloroethane 1430 120 1250 ND 114 77-126 <br /> Ethanol 23000 25000 25000 ND 92 55-200 <br /> Ethylbenzene 2960 120 1250 1600 109 89-122 <br /> Ethyl tert-butyl ether 1180 250 1250 ND 94 71-120 <br /> Methyl tert-butyl ether 1180 120 1250 ND 94 70-122 <br /> Toluene 14500 120 1250 14000 40 84-119 BB,LN <br /> es(total) 14200 120 3750 11000 85 86-132 LN <br /> ogale Dtbromofluoromethane 480 500 96 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 58 500 92 74-135 <br /> Surrogate Toluene-d8 468 5 00 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 86 500 97 86-119 <br /> Matrix Spike Dup(4090417-MSDI) Source P409117-03 Prepared&Analyzed 09/16/04 <br /> Tert-amyl methyl ether 1250 250 ug/l 1250 ND 100 78-117 7 20 <br /> Benzene 9890 120 1250 9000 71 81-118 5 20 BB LN <br /> Tert-butyl alcohol 25500 5000 25000 ND 102 60-147 2 20 <br /> Di-isopropyl ether 1210 250 1250 ND 97 70-125 0 8 20 <br /> 1,2-Dibromoethane(EDB) 1420 120 1250 69 108 85-125 4 20 <br /> 12-Dichloroethane 1480 120 1250 ND 118 77-126 3 20 <br /> Ethanol 23700 25000 25000 ND 95 55-200 3 20 <br /> Ethylbenzene 2990 120 1250 1600 111 89-122 1 20 <br /> Ethyl tert-butyl ether 1200 250 1250 ND 96 71-120 2 20 <br /> Methyl tert-butyl ether 1230 120 1250 ND 98 70-122 4 20 <br /> Toluene 15200 120 1250 14000 96 84-119 5 20 <br /> Xylenes(total) 14600 120 3750 11000 96 86-132 3 20 <br /> Surrogate Dibromofluoromethane 4 92 500 98 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 81 500 96 74-135 <br /> Surrogate Toluene-d8 496 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 510 500 102 86-119 <br /> nota Analytical-Petaluma I he 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 13 of 15 <br />