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Sequoia 1455 McDowell lNorth Ste <br /> Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabsabs co com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project NumberG09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elanh 04/14/05 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Lunit Units Level Result %REC Limits RPD limit Notes <br /> Batch 5040114-EPA 5030B waters/EPA 8260B <br /> Blank(5040114-SLK]) Prepared&Analyzed 04/13/05 <br /> Tert-amyl methyl ether ND 1 0 ugn <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1 2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> ylenes(total) ND 0 50 " <br /> urrogate Dibromofluoromethane 480 500 96 84-122 <br /> Surrogate 1,2 Dichloroethane-d4 4 73 5 00 95 74-135 <br /> Surrogate Toluene-d8 4 74 500 95 84-119 <br /> Surrogate 4-Brainaluorobenzene 533 500 107 86-119 <br /> Laboratory Control Sample(5040114-BS1) Prepared&Analyzed 04/13/05 <br /> Tert-amyl methyl ether 500 1 0 ug/l Soo 100 78-117 <br /> Benzene 4 83 0 50 500 97 81-118 <br /> Tert-butyl alcohol 91 2 20 " 100 91 60-147 <br /> Di-isopropyl ether 5 18 1 0 500 104 70-125 <br /> 1,2-Dibromoethane(EDB) 4 92 050 500 98 85-125 <br /> 1,2-Dichloroethane 467 0 50 500 93 77-126 <br /> Ethanol 170 100 100 170 55-200 <br /> Ethylbenzene 5 05 0 50 500 101 89-122 <br /> Ethyl tert-butyl ether 4 85 1 0 5 00 97 71-120 <br /> Methyl tert-butyl ether 498 050 5 00 100 70-122 <br /> Toluene 4 91 050 5 00 98 84-119 <br /> Xylenes(total) 155 050 15 0 103 86-132 <br /> Surrogate Dibromofluoromethane 4 79 500 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 448 500 90 74-135 <br /> Surrogate Toluene-d8 4 74 500 95 84-119 <br /> Surrogate 4-BromoJluorobenzene 5 37 500 107 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 /> This analytical report must be reproduced in its entirety <br /> Page 18 of 20 <br />