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0 <br /> Scq uoia 1455 McDowell Blvd,North Ste D <br /> Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX equo labs c 42 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P404555 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/13/04 18 04 <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 4050019-EPA 5030(pres 48h) <br /> Matrix Spike(4050019-MSI) Source P404658-01 Prepared&Analyzed 0510310_4 <br /> Tert-amyl methyl ether 0 283 0 025 mg/kg 0 250 ND 113 74-126 <br /> Benzene 0 287 0 025 0 250 ND 115 75-123 <br /> Tert-butyl alcohol 4 90 050 5 00 ND 98 66-129 <br /> Di-isopropyl ether 0 285 0 025 0 250 ND 114 71-127 <br /> l 2-Dibromoethatte(EDB) 0 299 0 025 0 250 ND 120 88-118 QC01 <br /> l 2-Dichloroethane 0 275 0 025 0 250 ND 110 79-119 <br /> Ethanol 6 04 1 0 5 00 ND 121 70-140 <br /> Ethylbenzene 0 285 0 025 0 250 ND 114 65-135 <br /> Ethyl tent-butyl ether 0 287 0 025 0 250 ND 115 72-123 <br /> Methyl tert-butyl ether 0 468 0 025 0 250 0 16 123 70-125 <br /> Toluene 0 278 0 025 0 250 ND 111 76-123 <br /> Surrogate DibrornoJluoromethane 00477 0 0500 95 81-126 <br /> Surrogate 12 Dichloroethane d4 00465 00500 93 73-131 <br /> Surrogate Toluene d8 00490 00500 98 82-129 <br /> Matrix Spike Du (4050019-MSD1) Source P404658-01 Prepared&Analyzed 05/03/04 <br /> Tert-amyl methyl ether 0 240 0 025 mg/kg 0 250 ND 96 74-126 16 35 <br /> Benzene 0 238 0 025 0 250 ND 95 75-123 19 35 <br /> Tett-butyl alcohol 3 95 050 5 00 ND 79 66-129 21 35 <br /> DI-isopropyl ether 0 228 0 025 0 250 ND 91 71-127 22 35 <br /> 1,2-Dibromoethane(EDB) 0 242 0 025 0 250 ND 97 88-118 21 35 <br /> 1 2-Dichloroethane 0 235 0 025 0 250 ND 94 79-119 16 35 <br /> Ethanol 3 26 1 0 5 00 ND 65 70-140 60 35 QCO2,QC20 <br /> Ethylbenzene 0 235 0 025 0 250 ND 94 65-135 19 35 <br /> Ethyl ter(-butyl ether 0 241 0 025 0 250 ND 96 72-123 17 35 <br /> Methyl ter(-butyl ether 0 350 0 025 0 250 0 16 76 70-125 29 35 <br /> Toluene 0 229 0 025 0 250 ND 92 76-123 19 35 <br /> Surrogate Dibromofluoromethane 0 0504 00500 101 81-126 <br /> Surrogate I 1-Dichloroethane.-d4 00491 00500 98 73-131 <br /> Surrogate Toluene-d8 00493 00500 99 82-129 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> aJ custody document Unles r otherwise stated resulty are reported on a wet weight <br /> bases This analytical report must be reproduced in its entirety <br /> Page 12 of 19 <br />