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1 Sequoia 885 Jarvis Drive. <br /> Morgan Hill,CA 95037 <br /> D- (408)776-%00 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arco/] Project-.ARCO#2130,Stockton,CA M010544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number.GOBZK-0002 Reported: <br /> Sacramento:CA,95833 Project ManagerNernon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> .4 <br /> Sequoia Analytical-Morgan Hill ' <br /> Reporting Spike Souree "/6REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> T <br /> Batch 5I22020-EPA 5030B P/T/EPA 8260B <br /> Blank(5122020-BLK1) Prepared&Analyzed:09/22/05 <br /> tert-Amyl methyl ether ND 0.50 ug/l <br /> Benzene ND 0.50 " <br /> cert-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.)f ND 0.50 " <br /> Gasoline Range Organics(C4-Cl2) ND 50 <br /> ySurrogate:1,1-Dichloroethane-d4 2.11 2.50 84 60-135 <br /> Laboratory Control Sample(5I22020-BSI) Prepared&Analyzed:09/22/05 <br /> tert-Amyl methyl ether 13.3 0.50 ug/I 15.0 89 80-115 <br /> Benzene 4.67 0.50 '.5.16 91 65-115 <br /> tent-Butyl alcohol 128 20 143 90 75-150 <br /> Di-isopropyl ether 13.2 0.50 15.1 87 75-125 <br /> 1,2-Dichloroethane 13.1 0.50 14.7 89 85-130 <br /> Ethanol 126 100 141 89 70-I35 <br /> Ethyl tert-butyl ether 12.9 0.50 :15.0 86 75-130 <br /> Ethylbenzene , 6.08 0.50 7.54 81 75-135 <br /> Methyl ten-but i ether 6.20 0.50 7.02 88 65-125 <br /> Toluene 34.6 0.50 37.2 93 85-120 <br /> Xylenes(total): 35.6 0.50 41.4 86 85-125 <br /> Gasoline Range Organics(C4-C12) 493 50 440 112 70-124 <br /> i <br /> Surrogate:1,2-Dichloroethane-d4 1.89 2.50 76 60-135 <br /> f <br /> Sequoia Analytical-Morgan HILI 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 18 of 25 <br /> !1 <br />