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lSequoia SSS Jarvis Drive <br /> i. Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> 1� 1 FAX(408)782-6308 <br /> www.sequoialabs.com <br /> t <br /> URS Corporation[Arco]] Project:ARCO#2130,Stockton,CA MOI0544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento;CA,95833 Project ManagerP.Elarth 09/29/05 14:23 <br /> + Volatile Organic Compounds by EPA Method 8260B -.Quality Control <br /> Sequoia Analytical-Morgan Hill ' <br /> ly Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> el - <br /> Batch 5126007-EPA 5030E Modified/EPA 8260E <br /> Laboratory Control Sample(5I26007-BS1) Prepared&Analyzed:09/26/05 <br /> tett-Amyl methyl ether 18.0 0.50 ug/l 15.0 120 80-115 HL <br /> 4 <br /> Benzene 5.37 0.50 5.16 104 65-115 <br /> tert-Butyl alcohol 156 20 143 109 75-150 <br /> Di-isopropyl ether 16.9 0.50 " .15.1 112 75-125 <br /> 1,2-Dichloroethane 18.0 0.50. 14.7 122 85-130 <br /> Ethanol 179 100 141 127 70-135 IC <br /> Ethyl tert-butyl ether 17.7 0.50 '15.0 118 75-130 <br /> Ethylbenzene .I 7.05 0.50 7.54 94 75-135 <br /> Methyl tert-butyl ether 8.46 .0.50 7.02 121 65-125 <br /> Toluene 37.7 0.50 37.2 101 85-120 <br /> Xylenes(total), 40.5 0.50 41.4 98 85-125 <br /> Gasoline Range Organics(C4-C12) 427 50 440 97 70-124 <br /> iurrogate:l,1-Dichloroethane-d4 1.68 1.50 107 60-135 <br /> Laboratory Control Sample.(5I26007-BS2) Prepared&Analyzed:09/26/05 <br /> tert-Amyl methyl ether 17.6 0.50 ug/l 15.0 117 80-115 HL <br /> Benzene 5.64- 0.50 5.16 109 65-115 <br /> tert-Butyl alcohol 170 20 143 119 75-150 <br /> Di-isopropyl ether 17.2 0.50 15.1 114 75-125 <br /> 1,2-Dichloroethane 18.1 0.50 14.7 123 85-130 <br /> Ethanol 204 100 141 145 70-135 HL,IC <br /> Ethyl tert-butyl!ether 17.5 0.50 " 15.0 117 75-130 <br /> Ethylbenzene 7.43 0.50 7.54 99 75-135 <br /> Methyl tert-butyl ether 8.04 0.50 7.02 115 65-125 <br /> Toluene 39.9 0.50 37.2 107 85-120 <br /> Xylenes(total)i 42.2 0.50 41.4 102 85-125 <br /> Gasoline Range Organics(C4-Cl 2) 414 50 440 94 70.124 <br /> Surrogate:1,1-llichloroethane-d4 2.43 .1.50 97 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 entirely. <br /> Page 23 of 25 <br /> t <br />