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885 Jarvis Drive <br /> Sequoia Morgan HCA 95037 <br /> (400 8)775 9600 <br /> Analytical FAX equoi tabs cam www sequaialabs com <br /> URS Corporation[Arco I] Project ARCO#6020,Manteca,CA MOL0445 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC1 V-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/29/05 17 44 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Repotting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5L20018-EPA 5030B PIT 1 EPA 8260B <br /> Blank(5L20018-BLK1) Prepared 12/20/05 Analyzed 12/21/05 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 <br /> tett-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 <br /> 1,2-Dtbromoethane(EDB) ND 050 <br /> 1 2-Dtchloroethane ND 050 <br /> Ethanol ND 100 1C <br /> Ethyl tert-butyl ether ND 050 <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether ND 050 <br /> *Iene: <br /> ND 050(total) ND 050 <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 259 250 104 60-135 <br /> Laboratory Control Sample(5L20018-BSI) Prepared&Analyzed 12/20/05 _ <br /> tert-Amy]methyl ether 14 9 050 ug/l 150 99 80-115 <br /> Benzene 5 55 050 5 16 108 65-115 <br /> lert-Butyl alcohol 147 20 143 103 75-150 <br /> Di-tsopropyi ether 173 050 151 115 75-125 <br /> 1,2-Dtbromoethane(EDB) 15 9 050 149 107 85-120 <br /> 1,2-Dtchloroethane 181 050 147 123 85-130 <br /> Ethanol 177 100 142 125 70-135 IC <br /> Ethyl tert-butyl ether 167 050 15 0 1 1 1 75-130 <br /> Ethylbenzene 726 050 754 96 75-135 <br /> Methyl tert-butyl ether 755 050 702 108 65-125 <br /> Toluene 387 050 37 2 104 85-120 <br /> Xylenes(total) 374 050 41 2 91 85-125 <br /> Gasoline Range Organics(C4-C)2) 420 50 440 95 60-140 <br /> Surrogate 1 2-Dtchloroethane-d4 237 250 95 60-135 <br /> Sequoia Analytical-Morgan Hill The results to this report apply to the samples analyzed in accordance with the chain of <br /> cuatody document Unless otherwise stated results are reported on a wet weight bay's <br /> This analytical report must he reproduced to its entirety <br /> Page 8 of 12 <br />