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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA94954 <br /> 79 <br /> '"r►��♦"'' (707)792-1865 <br /> FAX Analytical www <br /> labsco2 <br /> www sequmalabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Projm Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source °/6REC RPD <br /> Analyte Result Irmn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4090738-EPA 5030B waters/EPA 8260B <br /> Matnx Spike(4090738-MSI) Source P409397-05 Prepared&Analyzed 09/29/04 <br /> Tert-amyl methyl ether 106 20 ug/l 100 ND 106 78-117 <br /> Benzene 112 10 100 ND 112 81-118 <br /> Tert-butyl alcohol 2620 400 2000 ND 131 60-147 <br /> Di-isopropyl ether 105 20 100 ND 105 70-125 <br /> I,2-Dtchloroethane 109 10 100 ND 109 77-126 <br /> Ethanol 5000 2000 2000 ND 250 55-200 <br /> Ethylbenzene 114 10 100 ND 114 89-122 <br /> Ethyl tent-butyl ether 103 20 100 ND 103 71-120 <br /> Methyl tert butyl ether 103 10 100 ND 103 70-122 <br /> Toluene 110 t0 100 ND 110 84-119 <br /> Xylenes(total) 341 10 300 ND 114 86-132 <br /> A&;-gate Dibromofluoromethane 457 500 91 84-122 <br /> urrogate 11-Dtchloroethane-d4 4 60 500 92 74-135 <br /> Surrogate Toluene-d8 468 500 94 84-119 <br /> Surrogate 4-BromoJluorobenzene 457 500 91 86-119 <br /> Matrix Spike Dup(4090738-MSD1) Source P409397-05 Prepared&Analyzed 09/29/04 <br /> Tert-amyl methyl ether 108 20 ugll 100 ND 108 78-117 2 20 <br /> Benzene 114 10 100 ND 114 81-118 2 20 <br /> Tert-butyl alcohol 2580 400 2000 ND 129 60-147 2 20 <br /> DI-isopropyl ether 105 20 100 ND 105 70-125 0 20 <br /> 12-Dichloroethane 113 io 100 ND 113 77-126 4 20 <br /> Ethanol 5190 2000 2000 ND 260 55-200 4 20 <br /> Ethylbenzene 117 10 100 ND 117 89-122 3 20 <br /> Ethyl tent-butyl ether 103 20 100 ND 103 71-120 0 20 <br /> Methyl tent-butyl ether 108 10 100 ND 108 70-122 5 20 <br /> Toluene 109 10 100 ND 109 84-119 09 20 <br /> Xylenes(total) 340 10 300 ND 113 86-132 03 20 <br /> Surrogate DrbromoJluoromelhane 462 " 500 92 84-121 <br /> Surrogate 12-Dtchloroethane-d4 467 500 93 74-135 <br /> Surrogate Toluene-d8 474 Soo 95 84-119 <br /> Surrogate 4 BromoJluorobenzene 441 500 88 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 slated,results are reported on a wet weight basis <br /> 7'hts analytical report must be reproduced in its entirety <br /> Page 22 of 29 <br />