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� 1455 McDowell Blvd North Ste D - <br /> Sequoia Petaluma,CA 94954 <br /> 4D (707) <br /> 792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P402290 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elanh 02/26/04 15 43 <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 4020455-EPA 5030B waters <br /> Matrix Spike 4020455-MS1 Source P402290-01 Prepared&Analyzed 02/20/04 <br /> Tert-amyl methyl ether 256 50 ug/l 250 ND 102 78-117 <br /> Benzene 1330 25 250 1200 52 81-118 QM-4X <br /> Tert-butyl alcohol 4960 1000 5000 ND 99 60-147 <br /> Di-isopropyl ether 269 50 " 250 ND 108 70-125 <br /> 1,2-Dtbromoethane(EDB) 256 25 250 ND 102 85-125 <br /> 1,2-Dichloroethane 316 25 250 ND 126 77-126 <br /> Ethanol 3910 5000 5000 ND 78 55-200 <br /> Ethylbenzene 329 25 250 74 102 89-122 <br /> Ethyl ten-butyl ether 257 50 250 ND 103 71420 <br /> Methyl tert-butyl ether 294 25 250 24 108 70-122 <br /> Toluene 247 25 250 12 94 84-119 <br /> Xylenes(total) 828 25 750 64 102 86-132 <br /> ate Dibromofluoromethane 6 61 600 110 84-112 <br /> urrogate 12-Dichloroethane-d4 6 12 " 600 102 74-135 <br /> Surrogate Toluene-d8 5 78 " 600 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 6 31 600 105 86-119 <br /> Matnx Spike Du 4020455-MSDI Source P402290-01 Prepared&Analyzed 02/20/04 <br /> Tert-amyl methyl ether 266 50 ugll 250 ND 106 78-117 4 20 <br /> Benzene 1400 25 250 1200 80 81-118 5 20 QM-4X <br /> Tert-butyl alcohol 6040 1000 5000 ND 121 60-147 20 20 <br /> Di-isopropyl ether 281 50 250 ND 112 70-125 4 20 <br /> 1,2-Dtbromoethane(EDS) 269 25 250 ND 108 85-125 5 20 <br /> 1,2-Dichloroethane 335 25 250 ND 134 77-126 6 20 Q-LIM <br /> Ethanol 6850 5000 5000 ND 137 55-200 55 20 QR-07 <br /> Ethylbenzene 337 25 250 74 105 89-122 2 20 <br /> Ethyl tert-butyl ether 269 50 250 ND 108 71-120 5 20 <br /> Methyl tert-butyl ether 304 25 250 24 112 70-122 3 20 <br /> Toluene 261 25 250 12 100 84-119 6 20 <br /> Xylenes(total) 864 25 750 64 107 86-132 4 20 <br /> Surrogate Dibromofluoromethane 6 85 600 114 84-122 <br /> Surrogate 12-Dichloroethane-d4 645 600 108 74-135 <br /> Surrogate Toluene-d8 592 6 00 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 632 600 105 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed m 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 14 of 15 <br />