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�- F 885 Jarvis Drive <br /> SequoiaSequoia <br /> _. Morgan Hill,CA 95437 <br /> Anal Lical (408)776 9600 <br /> Y FAX(408)782-6308 <br /> r. www.sequoialabs.com <br /> x <br /> URS Corporation[Arcol] '` Project:ARCO#2130,Stockton,CA M010544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number.GOBZK-0002 Reported: <br /> Sacramento iCA,95833 Project Manager:Wrnon 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 C <br /> Analyte ? Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> A <br /> Batch 5122001 -EPA 500B PIT I EPA 8260B <br /> Laboratory Control Sample(5122,001-BS 1) Prepared&Analyzed:09/22/05 <br /> tert-Amyl methyl ether 16.6 0,50 ug/1 15.0 111 80-115 <br /> Benzene 5,32 0.50 5,16 103 r 65-115 <br /> tert-Butyl alcohol 161 20 4143 113 75-150 <br /> Di-isopropyl ether 14.9 0.50 15.1 99 75-125 <br /> 1,2-Dichloroethane 15.2 0,50 .14.7 103 85-130 <br /> Ethanol 196 100 141 139 70-135 HL <br /> Ethyl tert-butyl;ether 16.0 0.50 15A 107 75-130 <br /> Ethylbenzene 7,60 0.50 7.54 101 75-135 <br /> Methyl tert-butyl ether 7.66 0.50 7.02 109 65-125 <br /> Toluene 37.1 0.50 37.2 100 85-120 <br /> Xylenes(total) 41.7 0.50 41.4 101 85-125 <br /> Gasoline Range Organics(C4-C12) 466 50 440 106 70-124 <br /> iurrog43te:1,1-Dichloroethane-d4 1.08 2.50 83 60-135 <br /> Laboratory Control Sample(5I22001-BS2) Prepared&Analyzed:09/22/05 <br /> tert-Amyl methyl ether 16.9 0.50 -ugA 15.0 113 80-115 <br /> Benzene 5.45 0.50 5.16 106 65-115 <br /> tert-Butyl alcohol 142 20 143 99 75-150 <br /> Di-isopropyl ether 14.9 0.50 15.1 99 75-125 <br /> h <br /> 1,2-Dichloroethane 15.0 0.50 t' 14.7 102 85-130 <br /> Ethanol 201 100 141 143 70-135 HL <br /> Ethyl tert-butyliether 16.2 0.50 15.0 108 75-130 <br /> Ethylbenzene 7.69 0.50 7.54 102 75-135 <br /> Methyl tert-butyl ether 7.75 0.50 7,02 110 65-125 <br /> Toluene 37.5 0.50 37.2 101 85-120 <br /> Xylenes(total) 41.6 0.50 41.4 100 85-125 <br /> Gasoline Range Organics(C4-Cl2) 458 50 440 104 70-124 <br /> Surrogate:l,2-Dichloroethane-d4 2.01 2.50 81 60-135 <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 must be reproduced in its entirety. <br /> Page 16 of 25 <br /> i <br /> G <br />