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y1 , 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> �► Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> 1 <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 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 RPD Limit Notes <br /> Batch 4020616-EPA 5030 soils <br /> Matrix Spike(4020616-MS1) Source P402493-05 Prepared&Analyzed 02/27/04 <br /> Tert-amyl methyl ether 0 284 0 025 mg/kg 0 250 ND 114 74-126 <br /> Benzene 0 338 0 025 0 250 0 014 130 75-123 zQLIM <br /> Tert-butyl alcohol 5 29 0 50 5 00 0 060 105 66-129 <br /> Di-isopropyl ether 0 306 0 025 0 250 ND 122 71-127 <br /> 1,2-Dibromoethane(EDB) 0 281 0 025 0 250 ND 112 88-118 <br /> 1,2-Dtchloro ethane 0 283 0 025 0 250 ND 113 79-119 <br /> Ethanol 5 07 1 0 5 00 042 93 70-140 <br /> Ethylbenzene 0 299 0 025 0 250 ND 120 65-135 <br /> Ethyl tert-butyl ether 0 277 0 025 0 250 ND 111 72-123 <br /> Methyl tert-butyl ether 0 262 0 025 0 250 ND 105 70-125 <br /> Toluene 0 253 0 025 0 250 ND 101 76-123 <br /> 10 ogate Dibromofluoromethane 00421 00380 111 81-126 <br /> agate 1,2-Dichloroethane-d4 00407 00380 107 73-131 <br /> Surrogate Toluene-d8 00388 00380 102 82-129 <br /> Matrix Spike Dup(4020616-MSD1) Source P402493-05 Prepared&Analyzed 02/27/_04 <br /> Tert-am 1 methyl ether 0 257 0 025 m 0 250 ND 103 7 <br /> y y g/kg 4-126 10 35 <br /> Benzene 0 328 0 025 0 250 0 014 126 75-123 3 35 zQLIM <br /> Tert-butyl alcohol 4 59 0 50 5 00 0 060 91 66-129 14 35 <br /> Di-isopropyl ether 0 291 0 025 0 250 ND 116 71-127 5 35 <br /> 1,2-Dibromoethane(EDB) 0 249 0 025 0 250 ND 100 88-118 12 35 <br /> 1 2-Dichloroethane 0 257 0 025 0 250 ND 103 79-119 10 35 <br /> Ethanol 4 21 1 0 5 00 042 76 70-140 19 35 <br /> Ethylbenzene 0 274 0 025 0 250 ND 110 65-135 9 35 <br /> Ethyl tert-butyl ether 0 249 0 025 0 250 ND 100 72-123 11 35 <br /> Methyl tert-butyl ether 0 262 0 025 0 250 ND 105 70-125 0 35 <br /> Toluene 0 232 0 025 0 250 ND 93 76-123 9 35 <br /> .Surrogate Dibromofluoromethane 00421 00380 111 81-126 <br /> Surrogate 12-Dtchloroethane-d4 00391 00380 103 73-131 <br /> Surrogate Toluene-d8 00394 00380 104 82-129 <br /> iota Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basrs This analytical report must be reproduced in its entirety <br /> Page 19 of 25 <br />