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a— ) (408) <br /> [� q8851 CA Dave <br /> t.7�, i�Qia Morgan Htll CA 95037 <br /> Analytical FAX 776-9600 <br /> (408)782 6308 <br /> www sequotalabs com <br /> URS Corporation[Arcot] Project ARCO#2186,Stockton,CA M010313 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZM-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/28/05 10 46 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> ,Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5I20037-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(5I20037-BSI) Prepared 09/20/05 Analyzed 09/21/05 <br /> tert Amyl methyl ether 134 050 ugfl 150 89 80-115 <br /> Benzene 486 050 516 94 65-115 <br /> tert-Butyl alcohol 130 20 I43 91 75-150 <br /> Di-isopropyl ether 136 050 151 90 75-125 <br /> 1,2-Dibromoethane(EDB) 157 050 148 106 85-120 <br /> 1,2-Dichloroethane 113 050 147 90 85-130 <br /> Ethanol 137 100 141 97 70-135 <br /> Ethyl tert-butyl ether 133 050 150 89 75-130 <br /> Ethylbenzene 605 050 754 80 75-135 <br /> Methyl tert-butyl ether 650 050 702 93 65-125 <br /> Toluene 350 050 372 94 85-120 <br /> Xylenes(total) 353 050 414 85 85-125 <br /> Gasoline Rangc Organics(C4-C12) 507 50 440 115 70-124 <br /> Surrogate 12-Dzchloroethane-d4 190 250 76 60-135 <br /> Laboratory Control Sample(5I20037-BS2) Prepared 09/20/05 Analyzed 09/21/05 <br /> tert-Amyl methyl ether 140 050 ug/1 150 93 80-115 <br /> Benzene 488 050 5 16 95 65-115 <br /> tert-Butyl alcohol 111 20 143 78 75-150 <br /> Di-isopropyl ether 139 050 151 92 75-125 <br /> 1,2-Dibromoethane(EDB) 163 050 " 148 110 85-120 <br /> 1 2-Dichloroethane 135 050 147 92 85-130 <br /> Ethanol 117 100 141 83 70-135 <br /> Ethyl tert-butyl ether 137 050 150 91 75-130 <br /> Ethylbenzene 616 050 754 82 75-135 <br /> Methyl tert-butyl ether 685 050 702 98 65-125 <br /> Toluene 350 050 372 94 85-120 <br /> Xylenes(total) 355 050 414 86 85-125 <br /> Gasoline Range Organics(C4-Cl2) 523 50 440 119 70-124 <br /> Surrogate l 2-Dwhloroethane-d4 189 250 76 60-135 <br /> Sequoia Analytical-Morgan Htl1 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 /> f� This analytical report must be reproduced in its entirety <br /> Page 10 of I2 <br />