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P Sequoia 885 Jarvis Drive <br /> Morgan}fill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> � 4 <br /> URS Corporation[Arco/] Project:ARCO#2I30,Stockton,CA MOI0544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento'CA,95833 Project Manager:Vernon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> =4 <br /> Reporting Spike Source %REC RPU <br /> Analyte Result Limit Units Level Result %uREC Limits RPD Limit Notes <br /> Batch 5I26007-EPA 5030B Modified 1 EPA 8260B <br /> Matrix Spike(5I26007-MSI) Source:M010491-01RE2 Prepared&Analyzed:09/26/05 <br /> tert-Amyl methyl ether 166 5.0 ug/l 150 ND 11] 80-115 <br /> Benzene .55.5 5.0 51.6 ND 108 65-115 <br /> tert-Butyl alcohI ol 1790 200 1430 ND 125 75-120 LM <br /> Di-isopropyl ether 166 5.0 151 ND 110 75-125 <br /> 1,2-Dichloroethtane 167 5.0 147 ND 114 85-130 <br /> Ethanol 2590 1000 1410 140 174 70-135 <br /> HL,IC <br /> Ethyl tert-butyl jether 165 5.0 I50 ND 110 75-130 <br /> Ethylbenzene .t 71.6 5.0 75.4 ND 95 75-135 <br /> it <br /> Methyl tert-butyl ether 87.9 5.0 70.2 12 108 65-125 <br /> Toluene 388 5.0 .372 ND 104 85-120 <br /> Xylenes(total) 405 5.0 414 ND 98 85-125 <br /> +Gasoline Range Organics(C4-C12) 3990 500 4400 ND 91 70-124 <br /> ;iurrogaee:i,l-Dichloroethane-d4 2.38 2,30 95 60-135 <br /> Matrix Spike Dup(5I26007-MSDI) Source:M010491-01RE2 Prepared:09/26/05 Analyzed:09/27/05 <br /> terl-Amyl methyl ether 166 5.0 ug/l 150 ND 111 80-115 0 15 <br /> Benzene 53.8 5.0 " 51.6 NO 104 65-115 3 20 <br /> Cert-Butyl alcohol 1830 200 1430 ND 128 75-120 2 25 LM <br /> Di-isopropyl ether I66 5.0 151 ND 110 75-125 0 15 <br /> 1,2-Dichloro4ame 163 5.0 147 ND 111 85-130 2 20 <br /> Ethanol 2670 1000 '1410 140 179 70-135 3 35 HL,IC <br /> Ethyl tert-butyl'rether I67 5.0 " 150 ND 1 l 1 75-130 1 25 <br /> Ethylbenzene 70.2 5.0 " 75.4 ND 93. 75-135 2 15 <br /> Methyl tert-butyl ether 88.0 5.0 70.2 i 2 108 65-125 0.1 20 <br /> Toluene 372 5.0 .372 ND 100 85-120 4 20 <br /> Xylenes(total)1 397 . 5.0 414 ND 96 85-125 2 20 <br /> Gasoline Range Organics(C4-C12) 3890 500 " 4400 ND 88 70-124 3 20 <br /> Surrogate:1,1-bichloroethane-d4 2.18 1.50 87 60-135 <br /> !f <br /> 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 inure be reproduced in its entirety. <br /> Page 24 of 25 <br /> f - <br />