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• 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> 14WAnalytical 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 Sptke Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020565-EPA 5030 soils <br /> Matrix Spike 4020565-MS1 Source P402493-02 Prepared&Analyzed 02/2.5104 <br /> Tert-amyl methyl ether 0 273 0 025 mg/kg 0 250 ND 109 74-126 <br /> Benzene 0 331 0 025 0 250 0 056 110 75-123 <br /> Tert-butyl alcohol 4 54 0 50 500 ND 91 66-129 <br /> Di-isopropyl ether 0 295 0 025 0 250 ND 118 71-127 <br /> 1,2-Dibromoethane(EDB) 0 260 0 025 0 250 ND 104 88-118 <br /> 1 2-Dichloroethane 0 259 0 025 0 250 0 0091 100 79-119 <br /> Ethanol 425 1 0 5 00 042 77 70-140 <br /> Ethylbenzene 0 284 0 025 0 250 0 0085 110 65-135 <br /> Ethyl tert-butyl ether 0 270 0 025 0 250 ND 108 72-123 <br /> Methyl tert-butyl ether 0 547 0 025 0 250 0 35 79 70-125 <br /> Toluene 0 230 0 025 0 250 ND 92 76-123 <br /> rogate Dibromofluoromethane 0 0414 00380 109 81-126 <br /> ogale 1 2-Dichloroethane-d4 00400 00380 105 73-131 <br /> Surrogate Toluene-d8 00382 00380 101 82-129 <br /> Matrix Spike Dup(4020565-MSD1) Source P402493-02 Prepared&Analyzed 02/25/04 <br /> Tert-amyl methyl ether - 0 287 0 025 mg/kg 0 250 ND 115 74-126 5 35 � <br /> Benzene 0 319 0 025 0 250 0 056 105 75-123 4 35 <br /> Tert-butyl alcohol 5 65 0 50 500 ND 113 66-129 22 35 <br /> Di-isopropyl ether 0 310 0 025 0 250 ND 124 71-127 5 35 <br /> 1,2-Dibromoethane(EDB) 0 262 0 025 0 250 ND 105 88-118 0 8 35 <br /> 1 2-Dichloroethane 0 268 0 025 0 250 0 0091 104 79-119 3 35 <br /> Ethanol 4 78 1 0 5 00 042 87 70-140 12 35 <br /> Ethylbenzene 0 280 0 025 0 250 0 0085 109 65-135 1 35 <br /> Ethyl tert-butyl ether 0 281 0 025 0 250 ND 112 72-123 4 35 <br /> Methyl tert-butyl ether 0 591 0 025 0 250 0 35 96 70-125 8 35 <br /> Toluene 0 240 0 025 0 250 ND 96 76-t23 4 35 <br /> Surrogate Dibromofluoromethane 00392 00380 103 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 00385 00380 101 73-131 <br /> Surrogate Toluene-d8 00368 00380 97 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 slated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 15 of 25 <br />