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M <br /> • Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> (707)792-18651865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <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 %RFC Limits RPD Limit Notes <br /> Batch 4020581 -EPA 5030 soils <br /> Matrix Spike 4020581-MS1 Source P402477-03 Prepared&Analyzed 02/26/04 <br /> Tert-amyl methyl ether 0 275 0 025 mg/kg 0 250 ND 110 74-126 <br /> Benzene 0 295 0 025 0 250 0 032 105 75-123 <br /> Tert-butyl alcohol 5 13 0 50 5 00 ND 103 66-129 <br /> Di-isopropyl ether 0 296 0 025 0 250 ND 118 71-127 <br /> 1,2-Dtbromoethane(EDB) 0 263 0 025 0 250 ND 105 88-118 <br /> 1,2-Dichloroethane 0 275 0 025 0 250 ND 110 79-119 <br /> Ethanol 4 87 1 0 5 00 029 92 70-140 <br /> Ethylbenzene 0 276 0 025 0 250 ND 110 65-135 <br /> Ethyl cert-butyl ether 0 265 0 025 0 250 ND 106 72-123 <br /> Methyl tert-butyl ether 0 292 0 025 0 250 ND 117 70-125 <br /> Toluene 0 248 0 025 0 250 0 028 88 76-123 <br /> 401"gate Dibromofluoromethane 00415 00380 109 81-126 <br /> gate 1 2-Dichloroethane-d4 00417 00380 110 73-131 <br /> Surrogate Toluene-d8 00389 00380 102 82-129 <br /> _Matrix Spike up 4020581-MSD1) Source P4_0_2477-03 Prepared- &Analyzed 02/26/04 <br /> Tert-amyl methyl ether 0 267 0 025 mg/kg 0 250 ND 107 74-126 3 35 <br /> Benzene 0 278 0 025 0 250 0 032 98 75-123 6 35 <br /> Tert-butyl alcohol 4 84 0 50 5 00 ND 97 66-129 6 35 <br /> Di-isopropyl ether 0 302 0 025 0 250 ND 121 71-127 2 35 <br /> 1,2-Dtbromoethane(EDB) 0 263 0 025 0 250 ND 105 88-118 0 35 <br /> 1 2-Dtchloroethane 0 263 0 025 0 250 ND 105 79-119 4 35 <br /> Ethanol 462 1 0 5 00 029 87 70-140 5 35 <br /> Ethylbenzene 0 258 0 025 0 250 ND 103 65-135 7 35 <br /> Ethyl tert-butyl ether 0 270 0 025 0 250 ND 108 72-123 2 35 <br /> Methyl tert-butyl ether 0 301 0 025 0 250 ND 120 70-125 3 35 <br /> Toluene 0 228 0 025 0 250 0 028 80 76-123 8 35 <br /> Surrogate Dibromofluoromethane 00429 00380 113 81-126 <br /> Surrogate 1 2-Dtchloroethane-d4 00419 00380 110 73-131 <br /> Surrogate Toluene-d8 00383 00380 101 82-129 <br /> oia 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 /> basis This analytical report must be reproduced in its entirety <br /> Page 17 of 25 <br />