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th Ste <br /> Sequoia 1455McIh�wPealuma,CA 494 <br /> a_ _� (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs cont <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gatt-way Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source °/6REC RPD <br /> IA.,Iytc Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5410016-EPA 5030B waters/EPA 8260B <br /> Blank(5010016-BLK1) Prepared&Analyzed 01/03/05 <br /> Tert-amyl methyl ether ND 1 0 ug,9 <br /> Benzene ND 050 " <br /> Tert-butyl alcohot ND 20 " <br /> Di isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butylither ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 471 500 94 84-122 <br /> �urrogate 12 Dichloroethane-d4 536 „ 500 107 74-135 <br /> Surrogate 7oluene-d8 467 500 93 84-119 <br /> Surrogate 4 Bromofluorobenzene <br /> 459 500 92 86-119 <br /> Laboratory Control Sample(5010016-BS1) Prepared&Analyzed 01/03/05 <br /> Tert-amyl methyl ether 537 10 ug/l 500 107 78-117 <br /> Benzene 580 050 500 116 81-118 <br /> Tert-butyl alcohol 860 20 100 86 60-147 <br /> Di-isopropyl ether 563 10 Soo 113 70-125 <br /> 1,2-Dichloroethane 557 050 Soo 111 77 126 <br /> Ethanol 100 100 100 100 55 200 <br /> Ethylbenzcne 5 80 050 Soo 116 89-122 <br /> Ethyl tert butyl ether 531 10 500 106 71 120 <br /> Methyl tert-butyl ether 550 0 50 500 110 70 122 <br /> Toluene 5 72 050 5 00 114 84-119 <br /> Xylenes(total) 173 050 150 115 86-132 <br /> Surrogate Dibromofluoromethane 4 79 500 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 5 35 500 107 74-135 <br /> Surrogate Toluene-d8 4 76 500 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 469 500 94 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 22 of 33 <br />