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S q u 1 a MB85 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> (408)772-9600 <br /> Analytical FAx(406)782-6308 <br /> wwwsequoialabs.com <br /> URS Corporation[Arco I] ProjecCARCO#2130,Stockton,CA M0I0544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNemon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill t <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5I23007-EPA 5030B PIT/EPA 8260B <br /> Blank(5123007-BLKI) Prepared&Analyzed:09/23/05 <br /> tert-Amyl methyl ether ND 0.50 ugll <br /> Benzene ND 0.50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total)o ND 0.50 " <br /> ""Gasoline Range Organics(C4-Cl2) ND 50 " <br /> arrogate:1,2-Dichloroethane-d4 2.01 " 1.50 8D 60-135 <br /> Laboratory Control Sample(5123007-BSI) Prepared&Analyzed:09/23/05 <br /> tert-Amyl methyl ether 16.5 0.50 ugA 15.0 110 80-115 <br /> Benzene 5.30 0.50 5.16 103 65-115 <br /> tert-Butyl alco}iol 133 20 143 93 75-150 <br /> Di-isopropyl ether 14.7 0.50 15.1 97 75-125 <br /> 1,2-Dichloroethane 14.7 0.50 14.7 100 85-130 <br /> Ethanol 166 100 141 118 70-135 <br /> Ethyl tert-butyl tether - 15.9 0.50 .15.0 106 75-130 <br /> Ethylbenzene 7.61 0.50 7.54 101 75-135 <br /> Methyl tert-butyl ether 7.62 0.50 '7.02 109 65-125 <br /> Toluene 36.4 0.50 37.2 98 85-120 <br /> Xylenes(total)` 41.1 0.50 41.4 99 85-125 <br /> Gasoline Range Organics(C4-C12) 468 50 440 106 70-124 <br /> Surrogate:1,2-Dichloroethane-d4 2.07 -2.50 83 60-135 <br /> II� Sequoia Analytical-Morgan Hill 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 20 of 25 <br /> k. <br /> .� J <br />