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cry <br /> a <br /> Sequoia <br /> 1455 McDowell Blvd,North Ste D <br /> Se uoia Petaluma, 79 94954 <br /> g (707)79z-1 s6s <br /> Analytical42 <br /> FAX(707alabs om <br /> www sequoialabcorn <br /> 0 <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA 1`311134 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/18/03 18 08 <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 Lunt Notes <br /> Batch 3110305-EPA 5030 waters <br /> Matrix Spike(3110305-MSI) Source P311134-01 Prepared&Analyzed 11/13/03 <br /> Ter(-amyl methyl ether 246 50 ug/1 250 ND 98 70-116 <br /> Benzene 1070 25 250 1000 28 81-118 QM-4X <br /> Teri-butyl alcohol 4660 1000 5000 ND 93 62-142 <br /> Di-isopropyl ether 236 50 250 ND 94 71-121 <br /> 1,2-Dibromoethane(EDB) 271 25 250 ND 108 92-117 <br /> 1,2-Dichloroethane 257 25 250 ND 103 79-126 <br /> Ethanol 5770 5000 5000 ND 115 65-135 <br /> Ethylbenzene 288 25 250 28 104 89-122 <br /> Ethyl ten-butyl ether 235 50 250 ND 94 71-110 <br /> Methyl tert-butyl ether 259 25 250 27 93 77-123 <br /> Toluene 269 25 250 a 5 104 84-119 <br /> Xylenes(total) 883 25 750 81 107 86-132 <br /> *rr-g--,; <br /> Dibromofluoromethane 4 83 450 107 84-122 <br /> Surrogate 12-Dichloroethane-d4 445 450 99 74-135 <br /> Surrogate Toluene d8 5 13 450 114 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 23 450 116 86-119 <br /> Matrix Spike Dup(3110305-MSD1) Source P311134-01 Prepared 11/13/03 Analyzed 11/14/03 <br /> Tert-amyl methyl ether 240 50 ug/l 250 ND 96 70-116 2 20 <br /> Benzene 1010 25 250 1000 4 81-118 6 20 QM-4X <br /> Ten-butyl alcohol 4260 1000 5000 ND 85 62-142 9 20 <br /> Di-isopropyl ether 227 50 250 ND 91 71-121 4 20 <br /> 1,2-Dibromoethane(EDB) 269 25 250 ND 108 92-117 0 7 20 <br /> 1,2-Dichloroethane 148 25 250 ND 99 79-126 4 20 <br /> Ethanol 4980 5000 5000 ND 100 65-135 15 20 <br /> Ethylbenzene 274 25 250 28 98 89-122 5 20 <br /> Ethyl tert-butyl ether 229 50 250 ND 92 71-110 3 20 <br /> Methyl ter/-butyl ether 252 25 250 27 90 17-123 3 20 <br /> Toluene 256 25 250 85 99 84-119 5 20 <br /> Xylenes(total) 845 25 750 81 102 86-132 4 20 <br /> Surrogate Dibromofluoromethane 486 450 108 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 452 450 100 74-135 <br /> Surrogate Toluene-d8 511 450 114 84-119 <br /> Surrogate 4-Bromofluorobenzene 518 450 115 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> . custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 14 of 17 <br />